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class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 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3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="feedback-dialog-title"> <div data-view-component="true" class="Overlay-body"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="code-search-feedback-form" data-turbo="false" action="/search/feedback" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="hnWHgYsJg7GkjpiIIeKcPJhIZV943heq6Kk9cv1duLWuLafmtpoCANH0u53I+1wjWF/sPbW5lfWLuBVXQNPwvA==" /> <p>We read every piece of feedback, and take your input very seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> 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0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <span class="text-bold">24</span> forks </a> <a class="Link--secondary no-underline mr-3 d-inline-block" href="/WICG/shared-storage/branches"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-branch mr-1"> <path d="M9.5 3.25a2.25 2.25 0 1 1 3 2.122V6A2.5 2.5 0 0 1 10 8.5H6a1 1 0 0 0-1 1v1.128a2.251 2.251 0 1 1-1.5 0V5.372a2.25 2.25 0 1 1 1.5 0v1.836A2.493 2.493 0 0 1 6 7h4a1 1 0 0 0 1-1v-.628A2.25 2.25 0 0 1 9.5 3.25Zm-6 0a.75.75 0 1 0 1.5 0 .75.75 0 0 0-1.5 0Zm8.25-.75a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5ZM4.25 12a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5Z"></path> </svg> <span>Branches</span> </a> <a class="Link--secondary no-underline 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Storage API Explainer\u003c/h1\u003e\u003ca id=\"user-content-shared-storage-api-explainer\" class=\"anchor\" aria-label=\"Permalink: Shared Storage API Explainer\" href=\"#shared-storage-api-explainer\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAuthors: Alex Turner, Camillia Smith Barnes, Josh Karlin, Yao Xiao\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIntroduction\u003c/h2\u003e\u003ca id=\"user-content-introduction\" class=\"anchor\" aria-label=\"Permalink: Introduction\" href=\"#introduction\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn order to prevent cross-site user tracking, browsers are \u003ca href=\"https://blog.chromium.org/2020/01/building-more-private-web-path-towards.html\" rel=\"nofollow\"\u003epartitioning\u003c/a\u003e all forms of storage (cookies, localStorage, caches, etc) by top-frame site. But, there are many legitimate use cases currently relying on unpartitioned storage that will vanish without the help of new web APIs. We’ve seen a number of APIs proposed to fill in these gaps (e.g., \u003ca href=\"https://github.com/WICG/conversion-measurement-api\"\u003eConversion Measurement API\u003c/a\u003e, \u003ca href=\"https://github.com/privacycg/private-click-measurement\"\u003ePrivate Click Measurement\u003c/a\u003e, \u003ca href=\"https://developer.mozilla.org/en-US/docs/Web/API/Storage_Access_API\" rel=\"nofollow\"\u003eStorage Access\u003c/a\u003e, \u003ca href=\"https://github.com/WICG/trust-token-api\"\u003ePrivate State Tokens\u003c/a\u003e, \u003ca href=\"https://github.com/WICG/turtledove\"\u003eTURTLEDOVE\u003c/a\u003e, \u003ca href=\"https://github.com/WICG/floc\"\u003eFLoC\u003c/a\u003e) and some remain (including cross-origin A/B experiments and user measurement). We propose a general-purpose storage API that can help to serve as common infrastructure for privacy preserving cross-site use cases.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eShared Storage is a key/value store that is partitioned by calling origin (but not top-frame site). The keys and values are strings. While it's possible to write to Shared Storage from nearly anywhere (including response headers!), it is only possible to read from Shared Storage in tightly controlled environments, such as a JavaScript worklet environment which is provided by Shared Storage. These worklets have no capability of communicating with the outside world. They have no network communication and no \u003ccode\u003epostMessage\u003c/code\u003e. The only way data can leave these worklets, is via privacy-preserving APIs.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSpecification\u003c/h3\u003e\u003ca id=\"user-content-specification\" class=\"anchor\" aria-label=\"Permalink: Specification\" href=\"#specification\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSee the \u003ca href=\"https://wicg.github.io/shared-storage/\" rel=\"nofollow\"\u003edraft specification\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAPIs built on top of Shared Storage\u003c/h2\u003e\u003ca id=\"user-content-apis-built-on-top-of-shared-storage\" class=\"anchor\" aria-label=\"Permalink: APIs built on top of Shared Storage\" href=\"#apis-built-on-top-of-shared-storage\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis document only describes the core shared storage framework and infrastructure to store cross-site data privately and to read that data from within a secure worklet environment. APIs that use shared storage's data to produce some output are linked to below.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrivate Aggregation\u003c/h3\u003e\u003ca id=\"user-content-private-aggregation\" class=\"anchor\" aria-label=\"Permalink: Private Aggregation\" href=\"#private-aggregation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ca href=\"https://github.com/patcg-individual-drafts/private-aggregation-api\"\u003ePrivate Aggregation\u003c/a\u003e API allows for aggregated histograms to be sent based on data read from shared storage. The histograms are differentially private.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSelect URL\u003c/h3\u003e\u003ca id=\"user-content-select-url\" class=\"anchor\" aria-label=\"Permalink: Select URL\" href=\"#select-url\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ca href=\"https://github.com/WICG/shared-storage/blob/main/select-url.md\"\u003eselectURL\u003c/a\u003e API allows for content selection based on cross-site data. It takes 8 possible URLs as input and sends them to a worklet which selects from a small list of URLs. The chosen URL is stored in a fenced frame config as an opaque form that can only be read by a \u003ca href=\"https://github.com/WICG/fenced-frame\"\u003efenced frame\u003c/a\u003e; the embedder does not learn this information.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDemonstration\u003c/h2\u003e\u003ca id=\"user-content-demonstration\" class=\"anchor\" aria-label=\"Permalink: Demonstration\" href=\"#demonstration\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can \u003ca href=\"https://shared-storage-demo.web.app/\" rel=\"nofollow\"\u003etry out\u003c/a\u003e Shared Storage along with some APIs built for it using Chrome 104+.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample 1: Writing an experiment id to Shared Storage from a document\u003c/h3\u003e\u003ca id=\"user-content-example-1-writing-an-experiment-id-to-shared-storage-from-a-document\" class=\"anchor\" aria-label=\"Permalink: Example 1: Writing an experiment id to Shared Storage from a document\" href=\"#example-1-writing-an-experiment-id-to-shared-storage-from-a-document\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSince Shared Storage is meant for writing from anywhere, but reading is tightly constrained, it's not actually possible to know what you might have written to your storage from other sites. Is this the first time you've seen this user? Who knows! As such, \u003ccode\u003eShared Storage\u003c/code\u003e provides some useful functions beyond just \u003ccode\u003eset\u003c/code\u003e to write to keys only if they're not already present, and to append to a value rather than overwrite it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor example, let's say that you wanted to add a user to an experiment group, with a random assignment. But you want that group assignment to be sticky for the user across all of the sites that they visit that your third-party script is on. You may not know if you've ever written this key from this site before, but you certainly don't know if you've set it from another site. To solve this issue, utilize the \u003ccode\u003eignoreIfPresent\u003c/code\u003e option.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"try {\n sharedStorage.set('group', Math.floor(Math.random() * 1000), { ignoreIfPresent: true });\n} catch (error) {\n // Error handling\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'group'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eMath\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003efloor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eMath\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erandom\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1000\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eignoreIfPresent\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Error handling\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAnd \u003ccode\u003eShared Storage\u003c/code\u003e will only write the value if the key is not already present.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample 2: Writing to Shared Storage via a worklet\u003c/h3\u003e\u003ca id=\"user-content-example-2-writing-to-shared-storage-via-a-worklet\" class=\"anchor\" aria-label=\"Permalink: Example 2: Writing to Shared Storage via a worklet\" href=\"#example-2-writing-to-shared-storage-via-a-worklet\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn the event that \u003ccode\u003eignoreIfPresent\u003c/code\u003e is not sufficient, and you need to read your existing \u003ccode\u003eShared Storage\u003c/code\u003e data before adding new data, consider passing the information that you want to record to a worklet, and letting the worklet read the existing data and perform the write. Like so:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"try {\n const worklet = sharedStorage.createWorklet('https://site.example/writerWorklet.js');\n worklet.run('write', {data: {group: Math.floor(Math.random() * 1000)}});\n} catch (error) {\n // Error handling\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eworklet\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecreateWorklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'https://site.example/writerWorklet.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eworklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'write'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003edata\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003egroup\u003c/span\u003e: \u003cspan class=\"pl-v\"\u003eMath\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003efloor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eMath\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erandom\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1000\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Error handling\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAnd your \u003ccode\u003ewriterWorklet.js\u003c/code\u003e script would look like this:\n\u003ccode\u003ewriterWorklet.js\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"class Writer {\n async run(data) {\n const existingGroup = sharedStorage.get('group');\n if (!existingGroup) {\n cibst newGroup = data['group'];\n sharedStorage.set('group', newGroup);\n }\n }\n}\nregister('write', Writer);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eWriter\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eexistingGroup\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'group'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e!\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eexistingGroup\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ecibst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enewGroup\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'group'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'group'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enewGroup\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eregister\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'write'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eWriter\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample 3: Writing to Shared Storage with response headers\u003c/h3\u003e\u003ca id=\"user-content-example-3-writing-to-shared-storage-with-response-headers\" class=\"anchor\" aria-label=\"Permalink: Example 3: Writing to Shared Storage with response headers\" href=\"#example-3-writing-to-shared-storage-with-response-headers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt may be faster and more convenient to write to Shared Storage directly from response headers than from JavaScript. This is encouraged in cases where data is coming from a server anyway as it's faster and less intensive than JavaScript methods if you're writing to an origin other than the current document's origin.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eResponse headers can be used on document, image, and fetch requests.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ee.g.,:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;iframe src=\u0026quot;https://site.example/iframe\u0026quot; sharedstoragewritable\u0026gt;\u0026lt;/iframe\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003eiframe\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003ehttps://site.example/iframe\u003c/span\u003e\" \u003cspan class=\"pl-c1\"\u003esharedstoragewritable\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003eiframe\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe document request for \"\u003ca href=\"https://site.example/iframe\" rel=\"nofollow\"\u003ehttps://site.example/iframe\u003c/a\u003e\" will include a \u003ccode\u003eSec-Shared-Storage-Writable: ?1\u003c/code\u003e request header. Any request with this header can have a corresponding \u003ccode\u003eShared-Storage-Write\u003c/code\u003e response header that can write, like so:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Shared-Storage-Write: set;key=\u0026quot;group\u0026quot;;value=\u0026quot;4\u0026quot;;ignore_if_present\"\u003e\u003cpre\u003e\u003cspan class=\"pl-v\"\u003eShared\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eStorage\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eWrite\u003c/span\u003e: \u003cspan class=\"pl-k\"\u003eset\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ekey\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"group\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"4\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eignore_if_present\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample 4: Counting the number of views your content has received across sites\u003c/h3\u003e\u003ca id=\"user-content-example-4-counting-the-number-of-views-your-content-has-received-across-sites\" class=\"anchor\" aria-label=\"Permalink: Example 4: Counting the number of views your content has received across sites\" href=\"#example-4-counting-the-number-of-views-your-content-has-received-across-sites\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo count the number of times the user has viewed your third-party content, consider using the append option. Like so:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ee.g.,:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"try {\n window.sharedStorage.append('count', '1');\n} catch (error) {\n // Error handling\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003ewindow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eappend\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'count'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'1'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Error handling\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThen, sometime later in your worklet, you can get the total count:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"class Counter {\n async run(data) {\n const countLog = data['count']; // e.g.,: '111111111'\n const count = countLog.length;\n // do something useful with this data (such as recording an aggregate histogram) here...\n }\n}\nregister('count', Counter);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eCounter\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecountLog\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'count'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// e.g.,: '111111111'\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecount\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecountLog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elength\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// do something useful with this data (such as recording an aggregate histogram) here...\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eregister\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'count'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eCounter\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGoals\u003c/h2\u003e\u003ca id=\"user-content-goals\" class=\"anchor\" aria-label=\"Permalink: Goals\" href=\"#goals\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis API intends to support the storage and access needs for a wide array of cross-site data use cases. This prevents each API from having to create its own bespoke storage APIs.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRelated work\u003c/h2\u003e\u003ca id=\"user-content-related-work\" class=\"anchor\" aria-label=\"Permalink: Related work\" href=\"#related-work\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere have been multiple privacy proposals (\u003ca href=\"https://github.com/AdRoll/privacy/blob/main/SPURFOWL.md\"\u003eSPURFOWL\u003c/a\u003e, \u003ca href=\"https://github.com/1plusX/swan\"\u003eSWAN\u003c/a\u003e, \u003ca href=\"https://github.com/csharrison/aggregate-reporting-api\"\u003eAggregated Reporting\u003c/a\u003e) that have a notion of write-only storage with limited output. Shared Storage allows for each of those use cases, with only one storage API which is easier for developers to learn and requires less browser code. We’d also like to acknowledge the \u003ca href=\"https://github.com/WICG/kv-storage\"\u003eKV Storage\u003c/a\u003e explainer, to which we turned for API-shape inspiration.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProposed API surface\u003c/h2\u003e\u003ca id=\"user-content-proposed-api-surface\" class=\"anchor\" aria-label=\"Permalink: Proposed API surface\" href=\"#proposed-api-surface\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOutside of worklets (e.g., places where writing can happen)\u003c/h3\u003e\u003ca id=\"user-content-outside-of-worklets-eg-places-where-writing-can-happen\" class=\"anchor\" aria-label=\"Permalink: Outside of worklets (e.g., places where writing can happen)\" href=\"#outside-of-worklets-eg-places-where-writing-can-happen\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe modifier methods (\u003ccode\u003eset\u003c/code\u003e, \u003ccode\u003eappend\u003c/code\u003e, \u003ccode\u003edelete\u003c/code\u003e, \u003ccode\u003eclear\u003c/code\u003e, and \u003ccode\u003ebatchUpdate\u003c/code\u003e) should be made generally available across most any context. That includes top-level documents, iframes, shared storage worklets, Protected Audience worklets, service workers, dedicated workers, etc.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe shared storage worklet invocation methods (\u003ccode\u003eaddModule\u003c/code\u003e, \u003ccode\u003ecreateWorklet\u003c/code\u003e, and \u003ccode\u003erun\u003c/code\u003e) are available within document contexts.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.set(key, value, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSets \u003ccode\u003ekey\u003c/code\u003e’s entry to \u003ccode\u003evalue\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ekey\u003c/code\u003e and \u003ccode\u003evalue\u003c/code\u003e are both strings.\u003c/li\u003e\n\u003cli\u003eOptions include:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eignoreIfPresent\u003c/code\u003e (defaults to false): if true, a \u003ccode\u003ekey\u003c/code\u003e’s entry is not updated if the \u003ccode\u003ekey\u003c/code\u003e already exists. The embedder is not notified which occurred.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewithLock\u003c/code\u003e: acquire a lock on the designated resource before executing. See \u003ca href=\"#locking-for-modifier-methods\"\u003eLocking for modifier methods\u003c/a\u003e for details.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.append(key, value, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAppends \u003ccode\u003evalue\u003c/code\u003e to the entry for \u003ccode\u003ekey\u003c/code\u003e. Equivalent to \u003ccode\u003eset\u003c/code\u003e if the \u003ccode\u003ekey\u003c/code\u003e is not present.\u003c/li\u003e\n\u003cli\u003eOptions include:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ewithLock\u003c/code\u003e: acquire a lock on the designated resource before executing. See \u003ca href=\"#locking-for-modifier-methods\"\u003eLocking for modifier methods\u003c/a\u003e for details.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.delete(key, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eDeletes the entry at the given \u003ccode\u003ekey\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eOptions include:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ewithLock\u003c/code\u003e: acquire a lock on the designated resource before executing. See \u003ca href=\"#locking-for-modifier-methods\"\u003eLocking for modifier methods\u003c/a\u003e for details.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.clear(options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eDeletes all entries.\u003c/li\u003e\n\u003cli\u003eOptions include:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ewithLock\u003c/code\u003e: acquire a lock on the designated resource before executing. See \u003ca href=\"#locking-for-modifier-methods\"\u003eLocking for modifier methods\u003c/a\u003e for details.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.batchUpdate(methods, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eExecute \u003ccode\u003emethods\u003c/code\u003e in order.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003emethods\u003c/code\u003e is an array of method objects defining the operations to perform. Each object must be one of the following types: \u003ccode\u003eSharedStorageSetMethod\u003c/code\u003e, \u003ccode\u003eSharedStorageAppendMethod\u003c/code\u003e, \u003ccode\u003eSharedStorageDeleteMethod\u003c/code\u003e, or \u003ccode\u003eSharedStorageClearMethod\u003c/code\u003e. Each method object's constructor accepts the same parameters as the corresponding individual method (e.g., \u003ccode\u003eset\u003c/code\u003e, \u003ccode\u003eappend\u003c/code\u003e, \u003ccode\u003edelete\u003c/code\u003e, \u003ccode\u003eclear\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eOptions include:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ewithLock\u003c/code\u003e: acquire a lock on the designated resource before executing. See \u003ca href=\"#locking-for-modifier-methods\"\u003eLocking for modifier methods\u003c/a\u003e for details.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eThis method, with the \u003ccode\u003ewithLock\u003c/code\u003e option, allows multiple modifier methods to be executed atomically, enabling use cases where a website needs to maintain consistency while updating data organized across multiple keys.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.worklet.addModule(url, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eLoads and adds the module to the worklet (i.e. for registering operations). The handling should follow the \u003ca href=\"https://html.spec.whatwg.org/multipage/worklets.html#dom-worklet-addmodule\" rel=\"nofollow\"\u003eworklet standard\u003c/a\u003e, unless clarified otherwise below.\u003c/li\u003e\n\u003cli\u003eThis method can only be invoked once per worklet. This is because after the initial script loading, shared storage data (for the invoking origin) will be made accessible inside the worklet environment, which can be leaked via subsequent \u003ccode\u003eaddModule()\u003c/code\u003e (e.g. via timing).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eurl\u003c/code\u003e's origin need not match that of the context that invoked \u003ccode\u003eaddModule(url)\u003c/code\u003e.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIf \u003ccode\u003eurl\u003c/code\u003e is cross-origin to the invoking context, the worklet will use the invoking context's origin as its partition origin for accessing shared storage data and for budget checking and withdrawing.\u003c/li\u003e\n\u003cli\u003eAlso, for a cross-origin\u003ccode\u003eurl\u003c/code\u003e, the CORS protocol applies.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eRedirects are not allowed.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.worklet.run(name, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eRuns the operation previously registered by \u003ccode\u003eregister()\u003c/code\u003e with matching \u003ccode\u003ename\u003c/code\u003e. Does nothing if there’s no matching operation.\u003c/li\u003e\n\u003cli\u003eReturns a promise that resolves to \u003ccode\u003eundefined\u003c/code\u003e when the operation is queued:\u003c/li\u003e\n\u003cli\u003eOptions can include:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003edata\u003c/code\u003e, an arbitrary serializable object passed to the worklet.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ekeepAlive\u003c/code\u003e (defaults to false), a boolean denoting whether the worklet should be retained after it completes work for this call.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIf \u003ccode\u003ekeepAlive\u003c/code\u003e is false or not specified, the worklet will shutdown as soon as the operation finishes and subsequent calls to it will fail.\u003c/li\u003e\n\u003cli\u003eTo keep the worklet alive throughout multiple calls to \u003ccode\u003erun()\u003c/code\u003e, each of those calls must include \u003ccode\u003ekeepAlive: true\u003c/code\u003e in the \u003ccode\u003eoptions\u003c/code\u003e dictionary.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.run(name, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe behavior is identical to \u003ccode\u003ewindow.sharedStorage.worklet.run(name, options)\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ewindow.sharedStorage.createWorklet(url, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eCreates a new worklet, and loads and adds the module to the worklet (similar to the handling for \u003ccode\u003ewindow.sharedStorage.worklet.addModule(url, options)\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eBy default, the worklet uses the invoking context's origin as its partition origin for accessing shared storage data and for budget checking and withdrawing.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eTo instead use the worklet script origin (i.e. \u003ccode\u003eurl\u003c/code\u003e's origin) as the partition origin for accessing shared storage, pass the \u003ccode\u003edataOrigin\u003c/code\u003e option with \"script-origin\" as its value in the \u003ccode\u003eoptions\u003c/code\u003e dictionary.\u003c/li\u003e\n\u003cli\u003eTo use a custom origin as the partition origin for accessing shared storage, pass the \u003ccode\u003edataOrigin\u003c/code\u003e option with the serialized partition origin (i.e. the \u003ca href=\"https://url.spec.whatwg.org/#url-serializing\" rel=\"nofollow\"\u003eURL serialization\u003c/a\u003e of a URL with the same scheme, host, and port as the partition origin, but whose other components are empty) as its value in the \u003ccode\u003eoptions\u003c/code\u003e dictionary.\u003c/li\u003e\n\u003cli\u003eSupported values for the \u003ccode\u003edataOrigin\u003c/code\u003e option, if used, are the keywords \"script-origin\" and \"context-origin\", as well as any valid serialized HTTPS origin, e.g. \"\u003ca href=\"https://custom-data-origin.example\" rel=\"nofollow\"\u003ehttps://custom-data-origin.example\u003c/a\u003e\".\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\"script-origin\" designates the worklet script origin as the data partition origin.\u003c/li\u003e\n\u003cli\u003e\"context-origin\" (default) designates the invoking context origin as the data partition origin.\u003c/li\u003e\n\u003cli\u003eA serialized HTTPS origin designates itself as the data partition origin.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eWhen a valid serialized HTTPS URL is passed as the value for \u003ccode\u003edataOrigin\u003c/code\u003e and the parsed URL's origin is cross-origin to both the invoking context's origin and the worklet script's origin, the parsed URL's origin must host a JSON file at the \u003ca name=\"user-content-well-known\"\u003e/.well-known/\u003c/a\u003e path \"/.well-known/shared-storage/trusted-origins\" with an array of dictionaries, each with keys \u003ccode\u003escriptOrigin\u003c/code\u003e and \u003ccode\u003econtextOrigin\u003c/code\u003e. The values for these keys should be either a string or an array of strings.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eA string value should be either a serialized origin or \u003ccode\u003e\"*\"\u003c/code\u003e, where \u003ccode\u003e\"*\"\u003c/code\u003e matches all origins.\u003c/li\u003e\n\u003cli\u003eA value that is an array of strings should be a list of serialized origins.\u003c/li\u003e\n\u003cli\u003eFor example, the following JSON at \"\u003ca href=\"https://custom-data-origin.example/.well-known/shared-storage/trusted-origins\" rel=\"nofollow\"\u003ehttps://custom-data-origin.example/.well-known/shared-storage/trusted-origins\u003c/a\u003e\" allows script from \"\u003ca href=\"https://script-origin.a.example\" rel=\"nofollow\"\u003ehttps://script-origin.a.example\u003c/a\u003e\" to process \"\u003ca href=\"https://custom-data-origin.example%22's\" rel=\"nofollow\"\u003ehttps://custom-data-origin.example\"'s\u003c/a\u003e shared storage data when \u003ccode\u003ecreateWorklet\u003c/code\u003e is invoked in the context \"\u003ca href=\"https://context-origin.a.example\" rel=\"nofollow\"\u003ehttps://context-origin.a.example\u003c/a\u003e\", it allows script from \"\u003ca href=\"https://script-origin.b.example\" rel=\"nofollow\"\u003ehttps://script-origin.b.example\u003c/a\u003e\" to process \"\u003ca href=\"https://custom-data-origin.example%22's\" rel=\"nofollow\"\u003ehttps://custom-data-origin.example\"'s\u003c/a\u003e shared storage data when \u003ccode\u003ecreateWorklet\u003c/code\u003e is invoked in the context of either \"\u003ca href=\"https://context-origin.a.example\" rel=\"nofollow\"\u003ehttps://context-origin.a.example\u003c/a\u003e\" or \"\u003ca href=\"https://context-origin.b.example\" rel=\"nofollow\"\u003ehttps://context-origin.b.example\u003c/a\u003e\", and it also allows script from \"\u003ca href=\"https://script-origin.c.example\" rel=\"nofollow\"\u003ehttps://script-origin.c.example\u003c/a\u003e\" and \"\u003ca href=\"https://script-origin.d.example\" rel=\"nofollow\"\u003ehttps://script-origin.d.example\u003c/a\u003e\" to process \"\u003ca href=\"https://custom-data-origin.example%22's\" rel=\"nofollow\"\u003ehttps://custom-data-origin.example\"'s\u003c/a\u003e shared storage data when \u003ccode\u003ecreateWorklet\u003c/code\u003e is invoked in any origin's context.\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" [\n {\n scriptOrigin: \u0026quot;https://script-origin.a.example\u0026quot;,\n contextOrigin: \u0026quot;https://context-origin.a.example\u0026quot;\n },\n {\n scriptOrigin: \u0026quot;https://script-origin.b.example\u0026quot;,\n contextOrigin: [\u0026quot;https://context-origin.a.example\u0026quot;, \u0026quot;https://context-origin.b.example\u0026quot;]\n },\n {\n scriptOrigin: [\u0026quot;https://script-origin.c.example\u0026quot;, \u0026quot;https://script-origin.d.example\u0026quot;],\n contextOrigin: \u0026quot;*\u0026quot;\n }\n ]\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e [\n {\n scriptOrigin: \"https://script-origin.a.example\",\n contextOrigin: \"https://context-origin.a.example\"\n },\n {\n scriptOrigin: \"https://script-origin.b.example\",\n contextOrigin: [\"https://context-origin.a.example\", \"https://context-origin.b.example\"]\n },\n {\n scriptOrigin: [\"https://script-origin.c.example\", \"https://script-origin.d.example\"],\n contextOrigin: \"*\"\n }\n ]\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eThe object that the returned Promise resolves to has the same type with the implicitly constructed \u003ccode\u003ewindow.sharedStorage.worklet\u003c/code\u003e. However, for a worklet created via \u003ccode\u003ewindow.sharedStorage.createWorklet(url, options)\u003c/code\u003e, only \u003ccode\u003eselectURL()\u003c/code\u003e and \u003ccode\u003erun()\u003c/code\u003e are available, whereas calling \u003ccode\u003eaddModule()\u003c/code\u003e will throw an error. This is to prevent leaking shared storage data via \u003ccode\u003eaddModule()\u003c/code\u003e, similar to the reason why \u003ccode\u003eaddModule()\u003c/code\u003e can only be invoked once on the implicitly constructed \u003ccode\u003ewindow.sharedStorage.worklet\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eRedirects are not allowed.\u003c/li\u003e\n\u003cli\u003eWhen the module script's URL's origin is cross-origin with the worklet's creator window's origin and when \u003ccode\u003edataOrigin\u003c/code\u003e is \"script-origin\" (or when \u003ccode\u003edataOrigin\u003c/code\u003e is a valid serialized HTTPS URL that is same-origin to the worklet's script's origin), the check for trusted origins at the \u003ca href=\"#well-known\"\u003e/.well-known/ path\u003c/a\u003e will be skipped, and a \u003ccode\u003eShared-Storage-Cross-Origin-Worklet-Allowed: ?1\u003c/code\u003e response header is required instead.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe script server must carefully consider the security risks of allowing worklet creation by other origins (via \u003ccode\u003eShared-Storage-Cross-Origin-Worklet-Allowed: ?1\u003c/code\u003e and CORS), because this will also allow the worklet creator to run subsequent operations, and a malicious actor could poison and use up the worklet origin's budget.\u003c/li\u003e\n\u003cli\u003eNote that for the script server's infomation, the request header \"Sec-Shared-Storage-Data-Origin\" will be included with the value of the serialized data partition origin to be used if the data partition origin is cross-origin to the invoking context's origin.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIn the worklet, during \u003ccode\u003esharedStorage.worklet.addModule(url, options)\u003c/code\u003e or \u003ccode\u003esharedStorage.createWorklet(url, options)\u003c/code\u003e\u003c/h3\u003e\u003ca id=\"user-content-in-the-worklet-during-sharedstorageworkletaddmoduleurl-options-or-sharedstoragecreateworkleturl-options\" class=\"anchor\" aria-label=\"Permalink: In the worklet, during sharedStorage.worklet.addModule(url, options) or sharedStorage.createWorklet(url, options)\" href=\"#in-the-worklet-during-sharedstorageworkletaddmoduleurl-options-or-sharedstoragecreateworkleturl-options\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eregister(name, operation)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eRegisters a shared storage worklet operation with the provided \u003ccode\u003ename\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eoperation\u003c/code\u003e should be a class with an async \u003ccode\u003erun()\u003c/code\u003e method.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFor the operation to work with \u003ccode\u003esharedStorage.run()\u003c/code\u003e, \u003ccode\u003erun()\u003c/code\u003e should take \u003ccode\u003edata\u003c/code\u003e as an argument and return nothing. Any return value is \u003ca href=\"#default\"\u003eignored\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIn the worklet, during an operation\u003c/h3\u003e\u003ca id=\"user-content-in-the-worklet-during-an-operation\" class=\"anchor\" aria-label=\"Permalink: In the worklet, during an operation\" href=\"#in-the-worklet-during-an-operation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003esharedStorage.get(key)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eReturns a promise that resolves into the \u003ccode\u003ekey\u003c/code\u003e‘s entry or an empty string if the \u003ccode\u003ekey\u003c/code\u003e is not present.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esharedStorage.length()\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eReturns a promise that resolves into the number of keys.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esharedStorage.keys()\u003c/code\u003e and \u003ccode\u003esharedStorage.entries()\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eReturns an async iterator for all the stored keys or [key, value] pairs, sorted in the underlying key order.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esharedStorage.set(key, value, options)\u003c/code\u003e, \u003ccode\u003esharedStorage.append(key, value, options)\u003c/code\u003e, \u003ccode\u003esharedStorage.delete(key, options)\u003c/code\u003e, \u003ccode\u003esharedStorage.clear(options)\u003c/code\u003e, and \u003ccode\u003esharedStorage.batchUpdate(methods, options)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSame as outside the worklet, except that the promise returned only resolves into \u003ccode\u003eundefined\u003c/code\u003e when the operation has completed.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esharedStorage.context\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFrom inside a worklet created inside a \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frame\u003c/a\u003e, returns a string of contextual information, if any, that the embedder had written to the \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frame\u003c/a\u003e's \u003ca href=\"https://github.com/WICG/fenced-frame/blob/master/explainer/fenced_frame_config.md\"\u003eFencedFrameConfig\u003c/a\u003e before the \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frame\u003c/a\u003e's navigation.\u003c/li\u003e\n\u003cli\u003eIf no contextual information string had been written for the given frame, returns undefined.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003einterestGroups()\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eReturns a promise that resolves into an array of \u003ccode\u003eStorageInterestGroup\u003c/code\u003e. A \u003ccode\u003eStorageInterestGroup\u003c/code\u003e is a dictionary that extends the \u003ca href=\"https://wicg.github.io/turtledove/#dictdef-auctionadinterestgroup\" rel=\"nofollow\"\u003eAuctionAdInterestGroup\u003c/a\u003e dictionary with the following attributes:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eunsigned long long \u003ccode\u003ejoinCount\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eunsigned long long \u003ccode\u003ebidCount\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003esequence\u0026lt;\u003ca href=\"https://wicg.github.io/turtledove/#typedefdef-previouswin\" rel=\"nofollow\"\u003ePreviousWin\u003c/a\u003e\u0026gt; \u003ccode\u003eprevWinsMs\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eUSVString \u003ccode\u003ejoiningOrigin\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003elong long \u003ccode\u003etimeSinceGroupJoinedMs\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003elong long \u003ccode\u003elifetimeRemainingMs\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003elong long \u003ccode\u003etimeSinceLastUpdateMs\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003elong long \u003ccode\u003etimeUntilNextUpdateMs\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eunsigned long long \u003ccode\u003eestimatedSize\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe approximate size of the contents of this interest group, in bytes.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eThe \u003ca href=\"https://wicg.github.io/turtledove/#dictdef-auctionadinterestgroup\" rel=\"nofollow\"\u003eAuctionAdInterestGroup\u003c/a\u003e's \u003ca href=\"https://wicg.github.io/turtledove/#dom-auctionadinterestgroup-lifetimems\" rel=\"nofollow\"\u003elifetimeMs\u003c/a\u003e field will remain unset. It's no longer applicable at query time and is replaced with attributes \u003ccode\u003etimeSinceGroupJoinedMs\u003c/code\u003e and \u003ccode\u003elifetimeRemainingMs\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThis API provides the Protected Audience buyer with a better picture of what's happening with their users, allowing for Private Aggregation reports.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003enavigator.locks.request(resource, callback)\u003c/code\u003e and \u003ccode\u003enavigator.locks.request(resource, options, callback)\u003c/code\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAcquires a lock on \u003ccode\u003eresource\u003c/code\u003e and invokes \u003ccode\u003ecallback\u003c/code\u003e with the lock held. \u003ccode\u003enavigator.locks\u003c/code\u003e returns a \u003ccode\u003eLockManager\u003c/code\u003e as it does in a \u003ccode\u003eWindow\u003c/code\u003e. See the \u003ca href=\"https://w3c.github.io/web-locks/#dom-lockmanager-request\" rel=\"nofollow\"\u003erequest\u003c/a\u003e method in Web Locks API for details.\u003c/li\u003e\n\u003cli\u003eLock Scope: shared storage locks are partitioned by the shared storage data origin, and are independent of any locks obtained via \u003ccode\u003enavigator.locks.request\u003c/code\u003e in a \u003ccode\u003eWindow\u003c/code\u003e or \u003ccode\u003eWorker\u003c/code\u003e context. This prevents contention between shared storage locks and other locks, ensuring that shared storage data cannot be inadvertently leaked.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eFunctions exposed by APIs built on top of Shared Storage such as the \u003ca href=\"https://github.com/alexmturner/private-aggregation-api\"\u003ePrivate Aggregation API\u003c/a\u003e, e.g. \u003ccode\u003eprivateAggregation.contributeToHistogram()\u003c/code\u003e.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThese functions construct and then send an aggregatable report for the private, secure \u003ca href=\"https://github.com/WICG/conversion-measurement-api/blob/main/AGGREGATION_SERVICE_TEE.md\"\u003eaggregation service\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eThe report contents (e.g. key, value) are encrypted and sent after a delay. The report can only be read by the service and processed into aggregate statistics.\u003c/li\u003e\n\u003cli\u003eAfter a Shared Storage operation has been running for 5 seconds, Private Aggregation contributions are timed out. Any future contributions are ignored and contributions already made are sent in a report as if the Shared Storage operation had completed.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFrom response headers\u003c/h3\u003e\u003ca id=\"user-content-from-response-headers\" class=\"anchor\" aria-label=\"Permalink: From response headers\" href=\"#from-response-headers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ebatchUpdate()\u003c/code\u003e can be triggered via the HTTP response header \u003ccode\u003eShared-Storage-Write\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThis may provide a large performance improvement over creating a cross-origin iframe and writing from there, if a network request is otherwise required.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eShared-Storage-Write\u003c/code\u003e is a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-lists\" rel=\"nofollow\"\u003eList Structured Header\u003c/a\u003e.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eEach member of the \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-lists\" rel=\"nofollow\"\u003eList\u003c/a\u003e is a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-tokens\" rel=\"nofollow\"\u003eToken Item\u003c/a\u003e denoting either 1) the individual modifier method (\u003ccode\u003eset\u003c/code\u003e, \u003ccode\u003eappend\u003c/code\u003e, \u003ccode\u003edelete\u003c/code\u003e, \u003ccode\u003eclear\u003c/code\u003e), with any arguments for the method as associated \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-parameters\" rel=\"nofollow\"\u003eParameters\u003c/a\u003e, or 2) the options to apply to the whole batch, with any individual options as associated \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-parameters\" rel=\"nofollow\"\u003eParameters\u003c/a\u003e. A string type argument or option (\u003ccode\u003ekey\u003c/code\u003e, \u003ccode\u003evalue\u003c/code\u003e, \u003ccode\u003ewith_lock\u003c/code\u003e) can take the form of a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-tokens\" rel=\"nofollow\"\u003eToken Item\u003c/a\u003e or a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-strings\" rel=\"nofollow\"\u003eString Item\u003c/a\u003e or a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences\" rel=\"nofollow\"\u003eByte Sequence Item\u003c/a\u003e. A boolean type option (\u003ccode\u003eignore_if_present\u003c/code\u003e) can take the form of a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-booleans\" rel=\"nofollow\"\u003eBoolean Item\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eThe modifier methods \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-items\" rel=\"nofollow\"\u003eItems\u003c/a\u003e in the \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-lists\" rel=\"nofollow\"\u003eList\u003c/a\u003e are handled in the order they appear.\u003c/li\u003e\n\u003cli\u003eIf multiple \u003ccode\u003eoptions\u003c/code\u003e \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-items\" rel=\"nofollow\"\u003eItems\u003c/a\u003e appear in the \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-lists\" rel=\"nofollow\"\u003eList\u003c/a\u003e, the last one will be used.\u003c/li\u003e\n\u003cli\u003eThe individual modifier methods correspond to \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-items\" rel=\"nofollow\"\u003eItems\u003c/a\u003e as follows:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eset(\u0026lt;key\u0026gt;, \u0026lt;value\u0026gt;, {ignoreIfPresent: true})\u003c/code\u003e ←→ \u003ccode\u003eset;key=\u0026lt;key\u0026gt;;value=\u0026lt;value\u0026gt;;ignore_if_present\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eset(\u0026lt;key\u0026gt;, \u0026lt;value\u0026gt;, {ignoreIfPresent: false})\u003c/code\u003e ←→ \u003ccode\u003eset;key=\u0026lt;key\u0026gt;;value=\u0026lt;value\u0026gt;;ignore_if_present=?0\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eset(\u0026lt;key\u0026gt;, \u0026lt;value\u0026gt;, {withLock: \u0026lt;resource\u0026gt;})\u003c/code\u003e ←→ \u003ccode\u003eset;key=\u0026lt;key\u0026gt;;value=\u0026lt;value\u0026gt;;with_lock=\u0026lt;resource\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eset(\u0026lt;key\u0026gt;, \u0026lt;value\u0026gt;)\u003c/code\u003e ←→ \u003ccode\u003eset;key=\u0026lt;key\u0026gt;;value=\u0026lt;value\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eappend(\u0026lt;key\u0026gt;, \u0026lt;value\u0026gt;)\u003c/code\u003e ←→ \u003ccode\u003eappend;key=\u0026lt;key\u0026gt;;value=\u0026lt;value\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edelete(\u0026lt;key\u0026gt;)\u003c/code\u003e ←→ \u003ccode\u003edelete;key=\u0026lt;key\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eclear()\u003c/code\u003e ←→ \u003ccode\u003eclear\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003ebatchUpdate()\u003c/code\u003e options corresponds to an \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-items\" rel=\"nofollow\"\u003eItem\u003c/a\u003e as follows:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003e{withLock: \u0026lt;resource\u0026gt;}\u003c/code\u003e ←→ \u003ccode\u003eoptions;with_lock=\u0026lt;resource\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eExample 1: Single Update\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eHeader value: \u003ccode\u003eset;key=\"123\";value=\"456\";ignore_if_present\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eJavaScript equivalent: \u003ccode\u003esharedStorage.batchUpdate([new SharedStorageSetMethod(\"123\", \"456\", {ignoreIfPresent: true})])\u003c/code\u003e. Note that this is also equivalent to: \u003ccode\u003esharedStorage.set(\"123\", \"456\", {ignoreIfPresent: true})\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eExample 2: Batch Update with Lock\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eHeader value: \u003ccode\u003eset;key=\"123\";value=\"456\";ignore_if_present, append;key=abc;value=def, options;with_lock=\"report-lock\"\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eJavaScript equivalent: \u003ccode\u003esharedStorage.batchUpdate([new SharedStorageSetMethod(\"123\", \"456\", {ignoreIfPresent: true}), new SharedStorageAppendMethod(\"abc\", \"def\")], { withLock: \"report-lock\" })\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e\u0026lt;key\u0026gt;\u003c/code\u003e and \u003ccode\u003e\u0026lt;value\u0026gt;\u003c/code\u003e \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-parameters\" rel=\"nofollow\"\u003eParameters\u003c/a\u003e are of type \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-strings\" rel=\"nofollow\"\u003eString\u003c/a\u003e or \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences\" rel=\"nofollow\"\u003eByte Sequence\u003c/a\u003e.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eNote that \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-strings\" rel=\"nofollow\"\u003eStrings\u003c/a\u003e are defined as zero or more \u003ca href=\"https://www.rfc-editor.org/rfc/rfc20.html\" rel=\"nofollow\"\u003eprintable ASCII characters\u003c/a\u003e, and this excludes tabs, newlines, carriage returns, and so forth.\u003c/li\u003e\n\u003cli\u003eTo pass a key and/or value that contains non-ASCII and/or non-printable \u003ca href=\"https://www.rfc-editor.org/rfc/rfc3629.html\" rel=\"nofollow\"\u003eUTF-8\u003c/a\u003e characters, specify it as a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences\" rel=\"nofollow\"\u003eByte Sequence\u003c/a\u003e.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eA \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences\" rel=\"nofollow\"\u003eByte Sequence\u003c/a\u003e is delimited with colons and encoded using \u003ca href=\"https://www.rfc-editor.org/rfc/rfc4648.html\" rel=\"nofollow\"\u003ebase64\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eThe sequence of bytes obtained by decoding the \u003ca href=\"https://www.rfc-editor.org/rfc/rfc4648.html\" rel=\"nofollow\"\u003ebase64\u003c/a\u003e from the \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences\" rel=\"nofollow\"\u003eByte Sequence\u003c/a\u003e must be valid \u003ca href=\"https://www.rfc-editor.org/rfc/rfc3629.html\" rel=\"nofollow\"\u003eUTF-8\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eFor example:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003e:aGVsbG8K:\u003c/code\u003e encodes \"hello\\n\" in a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc3629.html\" rel=\"nofollow\"\u003eUTF-8\u003c/a\u003e \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences\" rel=\"nofollow\"\u003eByte Sequence\u003c/a\u003e (where \"\\n\" is the newline character).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e:8J+YgA==:\u003c/code\u003e encodes \"😀\" in a \u003ca href=\"https://www.rfc-editor.org/rfc/rfc3629.html\" rel=\"nofollow\"\u003eUTF-8\u003c/a\u003e \u003ca href=\"https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences\" rel=\"nofollow\"\u003eByte Sequence\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eRemember that results returned via \u003ccode\u003eget()\u003c/code\u003e are \u003ca href=\"https://www.rfc-editor.org/rfc/rfc2781.html\" rel=\"nofollow\"\u003eUTF-16\u003c/a\u003e \u003ca href=\"https://webidl.spec.whatwg.org/#idl-DOMString\" rel=\"nofollow\"\u003eDOMStrings\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eModifying shared storage via response headers requires a prior opt-in via a corresponding HTTP request header \u003ccode\u003eSec-Shared-Storage-Writable: ?1\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe request header can be sent along with \u003ccode\u003efetch\u003c/code\u003e requests via specifying an option: \u003ccode\u003efetch(\u0026lt;url\u0026gt;, {sharedStorageWritable: true})\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe request header can alternatively be sent on document or image requests either\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003evia specifying a boolean content attribute, e.g.:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003e\u0026lt;iframe src=[url] sharedstoragewritable\u0026gt;\u0026lt;/iframe\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e\u0026lt;img src=[url] sharedstoragewritable\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eor via an equivalent boolean IDL attribute, e.g.:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eiframe.sharedStorageWritable = true\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eimg.sharedStorageWritable = true\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eRedirects will be followed, and the request header will be sent to the host server for the redirect URL.\u003c/li\u003e\n\u003cli\u003eThe origin used for Shared Storage is that of the server that sends the \u003ccode\u003eShared-Storage-Write\u003c/code\u003e response header(s).\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIf there are no redirects, this will be the origin of the request URL.\u003c/li\u003e\n\u003cli\u003eIf there are redirects, the origin of the redirect URL that is accompanied by the \u003ccode\u003eShared-Storage-Write\u003c/code\u003e response header(s) will be used.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eThe response header will only be honored if the corresponding request included the request header: \u003ccode\u003eSec-Shared-Storage-Writable: ?1\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eSee example usage below.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLocking for Modifier Methods\u003c/h3\u003e\u003ca id=\"user-content-locking-for-modifier-methods\" class=\"anchor\" aria-label=\"Permalink: Locking for Modifier Methods\" href=\"#locking-for-modifier-methods\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAll modifier methods (\u003ccode\u003eset\u003c/code\u003e, \u003ccode\u003eappend\u003c/code\u003e, \u003ccode\u003edelete\u003c/code\u003e, \u003ccode\u003eclear\u003c/code\u003e, \u003ccode\u003ebatchUpdate\u003c/code\u003e), whether invoked from JavaScript or from response headers, accept a \u003ccode\u003ewithLock: \u0026lt;resource\u0026gt;\u003c/code\u003e option. This option instructs the method to acquire a lock on the designated resource before executing.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe locks requested this way are partitioned by the shared storage data origin, and are independent of any locks obtained via \u003ccode\u003enavigator.locks.request\u003c/code\u003e in a Window or Worker context. Note that they share the same scope with the locks obtained via \u003ccode\u003enavigator.locks.request\u003c/code\u003e in the SharedStorageWorklet context.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUnlike \u003ccode\u003enavigator.locks.request\u003c/code\u003e, which offers various configuration options, the locks requested this way always use the default settings:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003emode: \"exclusive\"\u003c/code\u003e: The lock is never shared with other locks.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esteal: false\u003c/code\u003e: The lock will not preempt other locks.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eifAvailable: false\u003c/code\u003e: If the lock is currently held by others, keep waiting and don't skip.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample: Report on Multiple Keys\u003c/h4\u003e\u003ca id=\"user-content-example-report-on-multiple-keys\" class=\"anchor\" aria-label=\"Permalink: Example: Report on Multiple Keys\" href=\"#example-report-on-multiple-keys\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis example uses a lock to ensure that the read and delete operations inside the worklet runs atomically, preventing interference from the write operations outside the worklet.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWindow context:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"try {\n sharedStorage.batchUpdate([\n new SharedStorageSetMethod('key0', calculateValueFor('key0')),\n new SharedStorageSetMethod('key1', calculateValueFor('key1'))\n ], { withLock: 'report-lock' });\n\n await sharedStorage.worklet.addModule('report-on-multiple-keys-script.js');\n await sharedStorage.worklet.run('report-on-multiple-keys');\n} catch (error) {\n // Handle error.\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebatchUpdate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSharedStorageSetMethod\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key0'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ecalculateValueFor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key0'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSharedStorageSetMethod\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key1'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ecalculateValueFor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key1'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewithLock\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'report-lock'\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eworklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eaddModule\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'report-on-multiple-keys-script.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eworklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'report-on-multiple-keys'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Handle error.\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn the worklet script (\u003ccode\u003ereport-on-multiple-keys-script.js\u003c/code\u003e):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"class ReportOnMultipleKeysOperation {\n async run(data) {\n await navigator.locks.request(\u0026quot;report-lock\u0026quot;, async (lock) =\u0026gt; {\n const value1 = await sharedStorage.get('key1');\n const value2 = await sharedStorage.get('key2');\n\n // Record an aggregate histogram with `value1` and `value2` here...\n\n await sharedStorage.delete('key1');\n await sharedStorage.delete('key2');\n });\n }\n}\nregister('report-on-multiple-keys', ReportOnMultipleKeysOperation);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eReportOnMultipleKeysOperation\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enavigator\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elocks\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erequest\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"report-lock\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003elock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue1\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key1'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003evalue2\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eget\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key2'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Record an aggregate histogram with `value1` and `value2` here...\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003edelete\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key1'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003edelete\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key2'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eregister\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'report-on-multiple-keys'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eReportOnMultipleKeysOperation\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCaveat: Unexpected ordering\u003c/h4\u003e\u003ca id=\"user-content-caveat-unexpected-ordering\" class=\"anchor\" aria-label=\"Permalink: Caveat: Unexpected ordering\" href=\"#caveat-unexpected-ordering\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eModifier methods may block due to the lock, so may not execute in the order they appear in the code.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Resolve immediately. Internally, this may block to wait for the lock to be granted.\nsharedStorage.set('key0', 'value1', { withLock: 'resource0' });\n\n// Resolve immediately. Internally, this will execute immediately.\nsharedStorage.set('key0', 'value2');\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Resolve immediately. Internally, this may block to wait for the lock to be granted.\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key0'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'value1'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewithLock\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'resource0'\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Resolve immediately. Internally, this will execute immediately.\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eset\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'key0'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'value2'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eDevelopers should be mindful of this potential ordering issue.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRecommendations for lock usage\u003c/h3\u003e\u003ca id=\"user-content-recommendations-for-lock-usage\" class=\"anchor\" aria-label=\"Permalink: Recommendations for lock usage\" href=\"#recommendations-for-lock-usage\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf only a single key is involved, and the data is accessed at most once within and outside worklet, then the lock is unnecessary. This is because each access is inherently atomic. Example: \u003ca href=\"https://github.com/WICG/shared-storage/blob/main/select-url.md#simple-example-consistent-ab-experiments-across-sites\"\u003eA/B experiment\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf the worklet performs both read and write on the same key, then the lock is likely necessary. Example: \u003ca href=\"https://github.com/WICG/shared-storage/blob/main/select-url.md#a-second-example-ad-creative-selection-by-frequency\"\u003ecreative selection by frequency\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf the logic involes updating data organized across multiple keys, then the lock is likely necessary. \u003ca href=\"#example-report-on-multiple-keys\"\u003eExample: Report on Multiple Keys\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReporting embedder context\u003c/h3\u003e\u003ca id=\"user-content-reporting-embedder-context\" class=\"anchor\" aria-label=\"Permalink: Reporting embedder context\" href=\"#reporting-embedder-context\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn using the \u003ca href=\"https://github.com/patcg-individual-drafts/private-aggregation-api\"\u003ePrivate Aggregation API\u003c/a\u003e to report on advertisements within \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frames\u003c/a\u003e, for instance, we might report on viewability, performance, which parts of the ad the user engaged with, the fact that the ad showed up at all, and so forth. But when reporting on the ad, it might be important to tie it to some contextual information from the embedding publisher page, such as an event-level ID.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn a scenario where the input URLs for the \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frame\u003c/a\u003e must be k-anonymous, e.g. if we create a \u003ca href=\"https://github.com/WICG/fenced-frame/blob/master/explainer/fenced_frame_config.md\"\u003eFencedFrameConfig\u003c/a\u003e from running a \u003ca href=\"https://github.com/WICG/turtledove/blob/main/FLEDGE.md#2-sellers-run-on-device-auctions\"\u003eProtected Audience auction\u003c/a\u003e, it would not be a good idea to rely on communicating the event-level ID to the \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frame\u003c/a\u003e by attaching an identifier to any of the input URLs, as this would make it difficult for any input URL(s) with the attached identifier to reach the k-anonymity threshold.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eInstead, before navigating the \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frame\u003c/a\u003e to the auction's winning \u003ca href=\"https://github.com/WICG/fenced-frame/blob/master/explainer/fenced_frame_config.md\"\u003eFencedFrameConfig\u003c/a\u003e \u003ccode\u003efencedFrameConfig\u003c/code\u003e, we could write the event-level ID to \u003ccode\u003efencedFrameConfig\u003c/code\u003e using \u003ccode\u003efencedFrameConfig.setSharedStorageContext()\u003c/code\u003e as in the example below.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSubsequently, anything we've written to \u003ccode\u003efencedFrameConfig\u003c/code\u003e through \u003ccode\u003esetSharedStorageContext()\u003c/code\u003e prior to the fenced frame's navigation to \u003ccode\u003efencedFrameConfig\u003c/code\u003e, can be read via \u003ccode\u003esharedStorage.context\u003c/code\u003e from inside a shared storage worklet created by the \u003ca href=\"https://github.com/wicg/fenced-frame/\"\u003efenced frame\u003c/a\u003e, or created by any of its same-origin children.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn the embedder page:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// See https://github.com/WICG/turtledove/blob/main/FLEDGE.md for how to write an auction config.\nconst auctionConfig = { ... };\n\n// Run a Protected Audience auction, setting the option to \u0026quot;resolveToConfig\u0026quot; to true.\nauctionConfig.resolveToConfig = true;\nconst fencedFrameConfig = await navigator.runAdAuction(auctionConfig);\n\n// Write to the config any desired embedder contextual information as a string.\nfencedFrameConfig.setSharedStorageContext(\u0026quot;My Event ID 123\u0026quot;);\n\n// Navigate the fenced frame to the config.\ndocument.getElementById('my-fenced-frame').config = fencedFrameConfig;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// See https://github.com/WICG/turtledove/blob/main/FLEDGE.md for how to write an auction config.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eauctionConfig\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Run a Protected Audience auction, setting the option to \"resolveToConfig\" to true.\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eauctionConfig\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eresolveToConfig\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efencedFrameConfig\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enavigator\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erunAdAuction\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eauctionConfig\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Write to the config any desired embedder contextual information as a string.\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003efencedFrameConfig\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esetSharedStorageContext\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"My Event ID 123\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Navigate the fenced frame to the config.\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetElementById\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'my-fenced-frame'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003econfig\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efencedFrameConfig\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn the fenced frame (\u003ccode\u003emy-fenced-frame\u003c/code\u003e):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// Save some information we want to report that's only available inside the fenced frame.\nconst frameInfo = { ... };\n\n// Send a report using shared storage and private aggregation.\ntry {\n await window.sharedStorage.worklet.addModule('report.js');\n await window.sharedStorage.run('send-report', {\n data: { info: frameInfo },\n });\n} catch (error) {\n // Error handling\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// Save some information we want to report that's only available inside the fenced frame.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eframeInfo\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Send a report using shared storage and private aggregation.\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ewindow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eworklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eaddModule\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'report.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ewindow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'send-report'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003edata\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003einfo\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003eframeInfo\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Error handling\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn the worklet script (\u003ccode\u003ereport.js\u003c/code\u003e):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"class ReportingOperation {\n async run(data) {\n // Helper functions that map the embedder context to a predetermined bucket and the\n // frame info to an appropriately-scaled value.\n // See also https://github.com/patcg-individual-drafts/private-aggregation-api#examples\n function convertEmbedderContextToBucketId(context) { ... }\n function convertFrameInfoToValue(info) { ... }\n\n // The user agent sends the report to the reporting endpoint of the script's\n // origin (that is, the caller of `sharedStorage.run()`) after a delay.\n privateAggregation.contributeToHistogram({\n bucket: convertEmbedderContextToBucketId(sharedStorage.context) ,\n value: convertFrameInfoToValue(data.info)\n });\n }\n}\nregister('send-report', ReportingOperation);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eReportingOperation\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-en\"\u003erun\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Helper functions that map the embedder context to a predetermined bucket and the\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// frame info to an appropriately-scaled value.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// See also https://github.com/patcg-individual-drafts/private-aggregation-api#examples\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003econvertEmbedderContextToBucketId\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003econtext\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003econvertFrameInfoToValue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003einfo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e ... \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// The user agent sends the report to the reporting endpoint of the script's\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// origin (that is, the caller of `sharedStorage.run()`) after a delay.\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eprivateAggregation\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003econtributeToHistogram\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ebucket\u003c/span\u003e: \u003cspan class=\"pl-en\"\u003econvertEmbedderContextToBucketId\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003econtext\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-en\"\u003econvertFrameInfoToValue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edata\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003einfo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eregister\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'send-report'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eReportingOperation\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eKeeping a worklet alive for multiple operations\u003c/h3\u003e\u003ca id=\"user-content-keeping-a-worklet-alive-for-multiple-operations\" class=\"anchor\" aria-label=\"Permalink: Keeping a worklet alive for multiple operations\" href=\"#keeping-a-worklet-alive-for-multiple-operations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCallers may wish to run multiple worklet operations from the same context, e.g. they might select a URL and then send one or more aggregatable reports. To do so, they would need to use the \u003ccode\u003ekeepAlive: true\u003c/code\u003e option when calling each of the worklet operations (except perhaps in the last call, if there was no need to extend the worklet's lifetime beyond that call).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWriting to Shared Storage via response headers\u003c/h3\u003e\u003ca id=\"user-content-writing-to-shared-storage-via-response-headers\" class=\"anchor\" aria-label=\"Permalink: Writing to Shared Storage via response headers\" href=\"#writing-to-shared-storage-via-response-headers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor an origin making changes to their Shared Storage data at a point when they do not need to read the data, an alternative to using the Shared Storage JavaScript API is to trigger setter and/or deleter operations via the HTTP response header \u003ccode\u003eShared-Storage-Write\u003c/code\u003e as in the examples below.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn order to perform operations via response header, the origin must first opt-in via one of the methods below, causing the HTTP request header \u003ccode\u003eSec-Shared-Storage-Writable: ?1\u003c/code\u003e to be added by the user agent if the request is eligible based on permissions checks.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAn origin \u003ccode\u003ea.example\u003c/code\u003e could initiate such a request in multiple ways.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOn the client side, to initiate the request:\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003efetch()\u003c/code\u003e option:\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"fetch(\u0026quot;https://a.example/path/for/updates\u0026quot;, {sharedStorageWritable: true});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003efetch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"https://a.example/path/for/updates\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esharedStorageWritable\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003cli\u003eContent attribute option with an iframe (also possible with an img):\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" \u0026lt;iframe src=\u0026quot;https://a.example/path/for/updates\u0026quot; sharedstoragewritable\u0026gt;\u0026lt;/iframe\u0026gt;\n\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e \u0026lt;iframe src=\"https://a.example/path/for/updates\" sharedstoragewritable\u0026gt;\u0026lt;/iframe\u0026gt;\n\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003cli\u003eIDL attribute option with an iframe (also possible with an img):\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"let iframe = document.getElementById(\u0026quot;my-iframe\u0026quot;);\niframe.sharedStorageWritable = true;\niframe.src = \u0026quot;https://a.example/path/for/updates\u0026quot;;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eiframe\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egetElementById\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"my-iframe\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eiframe\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esharedStorageWritable\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-s1\"\u003eiframe\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"https://a.example/path/for/updates\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp dir=\"auto\"\u003eOn the server side, here is an example response header:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"Shared-Storage-Write: clear, set;key=\u0026quot;hello\u0026quot;;value=\u0026quot;world\u0026quot;;ignore_if_present;with_lock=\u0026quot;lock2\u0026quot;, append;key=\u0026quot;good\u0026quot;;value=\u0026quot;bye\u0026quot;, delete;key=\u0026quot;hello\u0026quot;, set;key=\u0026quot;all\u0026quot;;value=\u0026quot;done\u0026quot;, options;with_lock=\u0026quot;lock1\u0026quot;\"\u003e\u003cpre lang=\"text\" class=\"notranslate\"\u003e\u003ccode\u003eShared-Storage-Write: clear, set;key=\"hello\";value=\"world\";ignore_if_present;with_lock=\"lock2\", append;key=\"good\";value=\"bye\", delete;key=\"hello\", set;key=\"all\";value=\"done\", options;with_lock=\"lock1\"\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSending the above response header would be equivalent to making the following call on the client side, from either the document or a worklet:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\nsharedStorage.batchUpdate([\n new SharedStorageClearMethod(),\n new SharedStorageSetMethod(\u0026quot;hello\u0026quot;, \u0026quot;world\u0026quot;, {ignoreIfPresent: true, withLock: \u0026quot;lock2\u0026quot;}),\n new SharedStorageAppendMethod(\u0026quot;good\u0026quot;, \u0026quot;bye\u0026quot;),\n new SharedStorageDeleteMethod(\u0026quot;hello\u0026quot;),\n new SharedStorageSetMethod(\u0026quot;all\u0026quot;, \u0026quot;done\u0026quot;)\n], { withLock: \u0026quot;lock1\u0026quot; })\n\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ebatchUpdate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSharedStorageClearMethod\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSharedStorageSetMethod\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"hello\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"world\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eignoreIfPresent\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewithLock\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"lock2\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSharedStorageAppendMethod\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"good\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"bye\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSharedStorageDeleteMethod\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"hello\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSharedStorageSetMethod\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"all\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\"done\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ewithLock\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e\"lock1\"\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLoading cross-origin worklet scripts\u003c/h3\u003e\u003ca id=\"user-content-loading-cross-origin-worklet-scripts\" class=\"anchor\" aria-label=\"Permalink: Loading cross-origin worklet scripts\" href=\"#loading-cross-origin-worklet-scripts\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere are currently six (6) approaches to creating a worklet that loads cross-origin script. The partition origin for the worklet's shared storage data access depends on the approach.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsing the context origin as data partition origin\u003c/h4\u003e\u003ca id=\"user-content-using-the-context-origin-as-data-partition-origin\" class=\"anchor\" aria-label=\"Permalink: Using the context origin as data partition origin\" href=\"#using-the-context-origin-as-data-partition-origin\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe first three (3) approaches use the invoking context's origin as the partition origin for shared storage data access and the invoking context's site for shared storage budget withdrawals.\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eCall \u003ccode\u003eaddModule()\u003c/code\u003e with a cross-origin script.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn an \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" context in the embedder page:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"await sharedStorage.worklet.addModule(\u0026quot;https://b.example/worklet.js\u0026quot;);\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eawait sharedStorage.worklet.addModule(\"https://b.example/worklet.js\");\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor any subsequent \u003ccode\u003erun()\u003c/code\u003e or \u003ccode\u003eselectURL()\u003c/code\u003e operation invoked on this worklet, the shared storage data for \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" (i.e. the context origin) will be used.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eCall \u003ccode\u003ecreateWorklet()\u003c/code\u003e with a cross-origin script.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn an \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" context in the embedder page:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"const worklet = await sharedStorage.createWorklet(\u0026quot;https://b.example/worklet.js\u0026quot;);\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003econst worklet = await sharedStorage.createWorklet(\"https://b.example/worklet.js\");\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor any subsequent \u003ccode\u003erun()\u003c/code\u003e or \u003ccode\u003eselectURL()\u003c/code\u003e operation invoked on this worklet, the shared storage data for \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" (i.e. the context origin) will be used.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eCall \u003ccode\u003ecreateWorklet()\u003c/code\u003e with a cross-origin script, setting its \u003ccode\u003edataOption\u003c/code\u003e to the invoking context's origin.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn an \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" context in the embedder page:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"const worklet = await sharedStorage.createWorklet(\u0026quot;https://b.example/worklet.js\u0026quot;, {dataOrigin: \u0026quot;context-origin\u0026quot;});\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003econst worklet = await sharedStorage.createWorklet(\"https://b.example/worklet.js\", {dataOrigin: \"context-origin\"});\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor any subsequent \u003ccode\u003erun()\u003c/code\u003e or \u003ccode\u003eselectURL()\u003c/code\u003e operation invoked on this worklet, the shared storage data for \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" (i.e. the context origin) will be used.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsing the worklet script origin as data partition origin\u003c/h4\u003e\u003ca id=\"user-content-using-the-worklet-script-origin-as-data-partition-origin\" class=\"anchor\" aria-label=\"Permalink: Using the worklet script origin as data partition origin\" href=\"#using-the-worklet-script-origin-as-data-partition-origin\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe fourth approach uses the worklet script's origin as the partition origin for shared storage data access and the worklet script's site for shared storage budget withdrawals.\u003c/p\u003e\n\u003col start=\"4\" dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eCall \u003ccode\u003ecreateWorklet()\u003c/code\u003e with a cross-origin script, setting its \u003ccode\u003edataOption\u003c/code\u003e to the worklet script's origin.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn an \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" context in the embedder page:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"const worklet = await sharedStorage.createWorklet(\u0026quot;https://b.example/worklet.js\u0026quot;, {dataOrigin: \u0026quot;script-origin\u0026quot;});\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003econst worklet = await sharedStorage.createWorklet(\"https://b.example/worklet.js\", {dataOrigin: \"script-origin\"});\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor any subsequent \u003ccode\u003erun()\u003c/code\u003e or \u003ccode\u003eselectURL()\u003c/code\u003e operation invoked on this worklet, the shared storage data for \"\u003ca href=\"https://b.example\" rel=\"nofollow\"\u003ehttps://b.example\u003c/a\u003e\" (i.e. the worklet script origin) will be used, assuming that the worklet script's server confirmed opt-in with the required \"Shared-Storage-Cross-Origin-Worklet-Allowed: ?1\" response header.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsing a custom origin as data partition origin\u003c/h4\u003e\u003ca id=\"user-content-using-a-custom-origin-as-data-partition-origin\" class=\"anchor\" aria-label=\"Permalink: Using a custom origin as data partition origin\" href=\"#using-a-custom-origin-as-data-partition-origin\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe fifth through eighth approaches use a custom origin as the partition origin for shared storage data access and the custom origin's site for shared storage budget withdrawals.\u003c/p\u003e\n\u003col start=\"5\" dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eCall \u003ccode\u003ecreateWorklet()\u003c/code\u003e, setting its \u003ccode\u003edataOption\u003c/code\u003e to a string whose value is the serialization of the custom origin.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn an \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" context in the embedder page:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"const worklet = await sharedStorage.createWorklet(\u0026quot;https://a.example/worklet.js\u0026quot;, {dataOrigin: \u0026quot;https://custom.example\u0026quot;});\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003econst worklet = await sharedStorage.createWorklet(\"https://a.example/worklet.js\", {dataOrigin: \"https://custom.example\"});\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor any subsequent \u003ccode\u003erun()\u003c/code\u003e or \u003ccode\u003eselectURL()\u003c/code\u003e operation invoked on this worklet, the shared storage data for \"\u003ca href=\"https://custom.example\" rel=\"nofollow\"\u003ehttps://custom.example\u003c/a\u003e\" will be used, assuming that the \u003ca href=\"#well-known\"\u003e/.well-known/\u003c/a\u003e JSON file at \"\u003ca href=\"https://custom.example/.well-known/shared-storage/trusted-origins\" rel=\"nofollow\"\u003ehttps://custom.example/.well-known/shared-storage/trusted-origins\u003c/a\u003e\" contains an array of dictionaries, where one of its dictionaries has\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ethe \u003ccode\u003escriptOrigin\u003c/code\u003e key's value matches \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" (i.e. its value is \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\", \u003ccode\u003e\"*\"\u003c/code\u003e, or an array of strings containing \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\")\u003c/li\u003e\n\u003cli\u003ethe \u003ccode\u003econtextOrigin\u003c/code\u003e key's value matches \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" (i.e. its value is \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\", \u003ccode\u003e\"*\"\u003c/code\u003e, or an array of strings containing \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\")\u003c/li\u003e\n\u003c/ul\u003e\n\u003col start=\"6\" dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eCall \u003ccode\u003ecreateWorklet()\u003c/code\u003e with a cross-origin script, setting its \u003ccode\u003edataOption\u003c/code\u003e to a string whose value is the serialization of the custom origin.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn an \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" context in the embedder page:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"const worklet = await sharedStorage.createWorklet(\u0026quot;https://b.example/worklet.js\u0026quot;, {dataOrigin: \u0026quot;https://custom.example\u0026quot;});\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003econst worklet = await sharedStorage.createWorklet(\"https://b.example/worklet.js\", {dataOrigin: \"https://custom.example\"});\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor any subsequent \u003ccode\u003erun()\u003c/code\u003e or \u003ccode\u003eselectURL()\u003c/code\u003e operation invoked on this worklet, the shared storage data for \"\u003ca href=\"https://custom.example\" rel=\"nofollow\"\u003ehttps://custom.example\u003c/a\u003e\" will be used, assuming that the \u003ca href=\"#well-known\"\u003e/.well-known/\u003c/a\u003e JSON file at \"\u003ca href=\"https://custom.example/.well-known/shared-storage/trusted-origins\" rel=\"nofollow\"\u003ehttps://custom.example/.well-known/shared-storage/trusted-origins\u003c/a\u003e\" contains an array of dictionaries, where one of its dictionaries has\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ethe \u003ccode\u003escriptOrigin\u003c/code\u003e key's value matches \"\u003ca href=\"https://b.example\" rel=\"nofollow\"\u003ehttps://b.example\u003c/a\u003e\" (i.e. its value is \"\u003ca href=\"https://b.example\" rel=\"nofollow\"\u003ehttps://b.example\u003c/a\u003e\", \u003ccode\u003e\"*\"\u003c/code\u003e, or an array of strings containing \"\u003ca href=\"https://b.example\" rel=\"nofollow\"\u003ehttps://b.example\u003c/a\u003e\")\u003c/li\u003e\n\u003cli\u003ethe \u003ccode\u003econtextOrigin\u003c/code\u003e key's value matches \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\" (i.e. its value is \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\", \u003ccode\u003e\"*\"\u003c/code\u003e, or an array of strings containing \"\u003ca href=\"https://a.example\" rel=\"nofollow\"\u003ehttps://a.example\u003c/a\u003e\")\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eError handling\u003c/h2\u003e\u003ca id=\"user-content-error-handling\" class=\"anchor\" aria-label=\"Permalink: Error handling\" href=\"#error-handling\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that the shared storage APIs may throw for several possible reasons. The following list of situations is not exhaustive, but, for example, the APIs may throw if the site invoking the API is not \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md\"\u003eenrolled\u003c/a\u003e and/or \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations\"\u003eattested\u003c/a\u003e, if the user has disabled shared storage in site settings, if the \"shared-storage\" or \"shared-storage-select-url\" permissions policy denies access, or if one of its arguments is invalid.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe recommend handling exceptions. This can be done by wrapping \u003ccode\u003easync..await\u003c/code\u003e calls to shared storage JS methods in \u003ccode\u003etry...catch\u003c/code\u003e blocks, or by following calls that are not awaited with \u003ccode\u003e.catch\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"try {\n await window.sharedStorage.worklet.addModule('worklet.js');\n} catch (error) {\n // Handle error.\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003etry\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003ewindow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eworklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eaddModule\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'worklet.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003ecatch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Handle error.\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"window.sharedStorage.worklet.addModule('worklet.js')\n .catch((error) =\u0026gt; {\n // Handle error.\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003ewindow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eworklet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eaddModule\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'worklet.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecatch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Handle error.\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWorklets can outlive the associated document\u003c/h2\u003e\u003ca id=\"user-content-worklets-can-outlive-the-associated-document\" class=\"anchor\" aria-label=\"Permalink: Worklets can outlive the associated document\" href=\"#worklets-can-outlive-the-associated-document\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAfter a document dies, the corresponding worklet (if running an operation) will continue to be kept alive for a maximum of two seconds to allow the pending operation(s) to execute. This gives more confidence that any end-of-page operations (e.g. reporting) are able to finish.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePermissions Policy\u003c/h2\u003e\u003ca id=\"user-content-permissions-policy\" class=\"anchor\" aria-label=\"Permalink: Permissions Policy\" href=\"#permissions-policy\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eShared storage methods can be disallowed by the \"shared-storage\" \u003ca href=\"https://w3c.github.io/webappsec-permissions-policy/#policy-controlled-feature\" rel=\"nofollow\"\u003epolicy-controlled feature\u003c/a\u003e. Its default allowlist is * (i.e. every origin). APIs built on top of Shared Storage have their own specific permission policies, so it is possible to allow reading and writing of Shared Storage while disabling particular APIs.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePermissions Policy inside the shared storage worklet\u003c/h3\u003e\u003ca id=\"user-content-permissions-policy-inside-the-shared-storage-worklet\" class=\"anchor\" aria-label=\"Permalink: Permissions Policy inside the shared storage worklet\" href=\"#permissions-policy-inside-the-shared-storage-worklet\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe permissions policy inside the shared storage worklet will inherit the permissions policy of the associated document.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eData Retention Policy\u003c/h2\u003e\u003ca id=\"user-content-data-retention-policy\" class=\"anchor\" aria-label=\"Permalink: Data Retention Policy\" href=\"#data-retention-policy\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEach key is cleared after thirty days of last write (\u003ccode\u003eset\u003c/code\u003e or \u003ccode\u003eappend\u003c/code\u003e call). If \u003ccode\u003eignoreIfPresent\u003c/code\u003e is true, the last write time is updated.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eData Storage Limits\u003c/h2\u003e\u003ca id=\"user-content-data-storage-limits\" class=\"anchor\" aria-label=\"Permalink: Data Storage Limits\" href=\"#data-storage-limits\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eShared Storage is not subject to the quota manager, as that would leak information across sites. Therefore we limit the per-origin total key and value bytes to 5MB.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrivacy\u003c/h2\u003e\u003ca id=\"user-content-privacy\" class=\"anchor\" aria-label=\"Permalink: Privacy\" href=\"#privacy\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eShared Storage takes the following protective measures to prevent its stored data from being read by means other than via approved APIs (e.g., via side channels):\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eConcealed Operation Time and Errors\u003c/strong\u003e: When writing data or running worklet operations from the Window scope, the method returns immediately and will not expose errors that might arise from reading shared storage data.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eDisabled Storage Access before Loading Finishes\u003c/strong\u003e: Access to Shared Storage is disabled until a module script finishes loading. This prevents websites from using timing attacks to learn about the data stored in Shared Storage.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eIsolated Locks\u003c/strong\u003e: Locks requested for Shared Storage are completely separate from locks requested from the Window scope. This prevents information leakage through lock contention.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrivacy-Preserving APIs\u003c/h3\u003e\u003ca id=\"user-content-privacy-preserving-apis\" class=\"anchor\" aria-label=\"Permalink: Privacy-Preserving APIs\" href=\"#privacy-preserving-apis\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe APIs that can read data from Shared Storage have their own privacy documentation.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEnrollment and Attestation\u003c/h3\u003e\u003ca id=\"user-content-enrollment-and-attestation\" class=\"anchor\" aria-label=\"Permalink: Enrollment and Attestation\" href=\"#enrollment-and-attestation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUse of Shared Storage requires \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md\"\u003eenrollment\u003c/a\u003e and \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations\"\u003eattestation\u003c/a\u003e via the \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/README.md\"\u003ePrivacy Sandbox enrollment attestation model\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor each method in the Shared Storage API surface, a check will be performed to determine whether the calling \u003ca href=\"https://html.spec.whatwg.org/multipage/browsers.html#site\" rel=\"nofollow\"\u003esite\u003c/a\u003e is \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md\"\u003eenrolled\u003c/a\u003e and \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations\"\u003eattested\u003c/a\u003e. In the case where the \u003ca href=\"https://html.spec.whatwg.org/multipage/browsers.html#site\" rel=\"nofollow\"\u003esite\u003c/a\u003e is not \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md\"\u003eenrolled\u003c/a\u003e and \u003ca href=\"https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations\"\u003eattested\u003c/a\u003e, the promise returned by the method is rejected.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePossibilities for extension\u003c/h2\u003e\u003ca id=\"user-content-possibilities-for-extension\" class=\"anchor\" aria-label=\"Permalink: Possibilities for extension\" href=\"#possibilities-for-extension\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInteractions between worklets\u003c/h3\u003e\u003ca id=\"user-content-interactions-between-worklets\" class=\"anchor\" aria-label=\"Permalink: Interactions between worklets\" href=\"#interactions-between-worklets\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCommunication between worklets is not possible in the initial design. However, adding support for this would enable multiple origins to flexibly share information without needing a dedicated origin for that sharing. Relatedly, allowing a worklet to create other worklets might be useful.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRegistering event handlers\u003c/h3\u003e\u003ca id=\"user-content-registering-event-handlers\" class=\"anchor\" aria-label=\"Permalink: Registering event handlers\" href=\"#registering-event-handlers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe could support event handlers in future iterations. For example, a handler could run a previously registered operation when a given key is modified (e.g. when an entry is updated via a set or append call):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"sharedStorage.addEventListener(\n 'key' /* event_type */,\n 'operation-to-run' /* operation_name */,\n { key: 'example-key', actions: ['set', 'append'] } /* options */);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003esharedStorage\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eaddEventListener\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'key'\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e/* event_type */\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'operation-to-run'\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e/* operation_name */\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ekey\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'example-key'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eactions\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'set'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'append'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e/* options */\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAcknowledgements\u003c/h2\u003e\u003ca id=\"user-content-acknowledgements\" class=\"anchor\" aria-label=\"Permalink: Acknowledgements\" href=\"#acknowledgements\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMany thanks for valuable feedback and advice from:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eVictor Costan,\nChristian Dullweber,\nCharlie Harrison,\nJeff Kaufman,\nRowan Merewood,\nMarijn Kruisselbrink,\nNasko Oskov,\nEvgeny Skvortsov,\nMichael Tomaine,\nDavid Turner,\nDavid Van Cleve,\nZheng Wei,\nMike West.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Shared Storage API Explainer","anchor":"shared-storage-api-explainer","htmlText":"Shared Storage API Explainer"},{"level":2,"text":"Introduction","anchor":"introduction","htmlText":"Introduction"},{"level":3,"text":"Specification","anchor":"specification","htmlText":"Specification"},{"level":2,"text":"APIs built on top of Shared Storage","anchor":"apis-built-on-top-of-shared-storage","htmlText":"APIs built on top of Shared Storage"},{"level":3,"text":"Private Aggregation","anchor":"private-aggregation","htmlText":"Private Aggregation"},{"level":3,"text":"Select URL","anchor":"select-url","htmlText":"Select URL"},{"level":2,"text":"Demonstration","anchor":"demonstration","htmlText":"Demonstration"},{"level":3,"text":"Example 1: Writing an experiment id to Shared Storage from a document","anchor":"example-1-writing-an-experiment-id-to-shared-storage-from-a-document","htmlText":"Example 1: Writing an experiment id to Shared Storage from a document"},{"level":3,"text":"Example 2: Writing to Shared Storage via a worklet","anchor":"example-2-writing-to-shared-storage-via-a-worklet","htmlText":"Example 2: Writing to Shared Storage via a worklet"},{"level":3,"text":"Example 3: Writing to Shared Storage with response headers","anchor":"example-3-writing-to-shared-storage-with-response-headers","htmlText":"Example 3: Writing to Shared Storage with response headers"},{"level":3,"text":"Example 4: Counting the number of views your content has received across sites","anchor":"example-4-counting-the-number-of-views-your-content-has-received-across-sites","htmlText":"Example 4: Counting the number of views your content has received across sites"},{"level":2,"text":"Goals","anchor":"goals","htmlText":"Goals"},{"level":2,"text":"Related work","anchor":"related-work","htmlText":"Related work"},{"level":2,"text":"Proposed API surface","anchor":"proposed-api-surface","htmlText":"Proposed API surface"},{"level":3,"text":"Outside of worklets (e.g., places where writing can happen)","anchor":"outside-of-worklets-eg-places-where-writing-can-happen","htmlText":"Outside of worklets (e.g., places where writing can happen)"},{"level":3,"text":"In the worklet, during sharedStorage.worklet.addModule(url, options) or sharedStorage.createWorklet(url, options)","anchor":"in-the-worklet-during-sharedstorageworkletaddmoduleurl-options-or-sharedstoragecreateworkleturl-options","htmlText":"In the worklet, during sharedStorage.worklet.addModule(url, options) or sharedStorage.createWorklet(url, options)"},{"level":3,"text":"In the worklet, during an operation","anchor":"in-the-worklet-during-an-operation","htmlText":"In the worklet, during an operation"},{"level":3,"text":"From response headers","anchor":"from-response-headers","htmlText":"From response headers"},{"level":3,"text":"Locking for Modifier Methods","anchor":"locking-for-modifier-methods","htmlText":"Locking for Modifier Methods"},{"level":4,"text":"Example: Report on Multiple Keys","anchor":"example-report-on-multiple-keys","htmlText":"Example: Report on Multiple Keys"},{"level":4,"text":"Caveat: Unexpected ordering","anchor":"caveat-unexpected-ordering","htmlText":"Caveat: Unexpected ordering"},{"level":3,"text":"Recommendations for lock usage","anchor":"recommendations-for-lock-usage","htmlText":"Recommendations for lock usage"},{"level":3,"text":"Reporting embedder context","anchor":"reporting-embedder-context","htmlText":"Reporting embedder context"},{"level":3,"text":"Keeping a worklet alive for multiple operations","anchor":"keeping-a-worklet-alive-for-multiple-operations","htmlText":"Keeping a worklet alive for multiple operations"},{"level":3,"text":"Writing to Shared Storage via response headers","anchor":"writing-to-shared-storage-via-response-headers","htmlText":"Writing to Shared Storage via response headers"},{"level":3,"text":"Loading cross-origin worklet scripts","anchor":"loading-cross-origin-worklet-scripts","htmlText":"Loading cross-origin worklet scripts"},{"level":4,"text":"Using the context origin as data partition origin","anchor":"using-the-context-origin-as-data-partition-origin","htmlText":"Using the context origin as data partition origin"},{"level":4,"text":"Using the worklet script origin as data partition origin","anchor":"using-the-worklet-script-origin-as-data-partition-origin","htmlText":"Using the worklet script origin as data partition origin"},{"level":4,"text":"Using a custom origin as data partition origin","anchor":"using-a-custom-origin-as-data-partition-origin","htmlText":"Using a custom origin as data partition origin"},{"level":2,"text":"Error handling","anchor":"error-handling","htmlText":"Error handling"},{"level":2,"text":"Worklets can outlive the associated document","anchor":"worklets-can-outlive-the-associated-document","htmlText":"Worklets can outlive the associated document"},{"level":2,"text":"Permissions Policy","anchor":"permissions-policy","htmlText":"Permissions Policy"},{"level":3,"text":"Permissions Policy inside the shared storage worklet","anchor":"permissions-policy-inside-the-shared-storage-worklet","htmlText":"Permissions Policy inside the shared storage worklet"},{"level":2,"text":"Data Retention Policy","anchor":"data-retention-policy","htmlText":"Data Retention Policy"},{"level":2,"text":"Data Storage Limits","anchor":"data-storage-limits","htmlText":"Data Storage Limits"},{"level":2,"text":"Privacy","anchor":"privacy","htmlText":"Privacy"},{"level":3,"text":"Privacy-Preserving APIs","anchor":"privacy-preserving-apis","htmlText":"Privacy-Preserving APIs"},{"level":3,"text":"Enrollment and Attestation","anchor":"enrollment-and-attestation","htmlText":"Enrollment and Attestation"},{"level":2,"text":"Possibilities for extension","anchor":"possibilities-for-extension","htmlText":"Possibilities for extension"},{"level":3,"text":"Interactions between worklets","anchor":"interactions-between-worklets","htmlText":"Interactions between worklets"},{"level":3,"text":"Registering event handlers","anchor":"registering-event-handlers","htmlText":"Registering event handlers"},{"level":2,"text":"Acknowledgements","anchor":"acknowledgements","htmlText":"Acknowledgements"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2FWICG%2Fshared-storage"}},{"displayName":"CODE_OF_CONDUCT.md","repoName":"shared-storage","refName":"main","path":"CODE_OF_CONDUCT.md","preferredFileType":"code_of_conduct","tabName":"Code of 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class="heading-element" dir="auto">Shared Storage API Explainer</h1><a id="user-content-shared-storage-api-explainer" class="anchor" aria-label="Permalink: Shared Storage API Explainer" href="#shared-storage-api-explainer"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Authors: Alex Turner, Camillia Smith Barnes, Josh Karlin, Yao Xiao</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Introduction</h2><a id="user-content-introduction" class="anchor" aria-label="Permalink: Introduction" href="#introduction"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In order to prevent cross-site user tracking, browsers are <a href="https://blog.chromium.org/2020/01/building-more-private-web-path-towards.html" rel="nofollow">partitioning</a> all forms of storage (cookies, localStorage, caches, etc) by top-frame site. But, there are many legitimate use cases currently relying on unpartitioned storage that will vanish without the help of new web APIs. We’ve seen a number of APIs proposed to fill in these gaps (e.g., <a href="https://github.com/WICG/conversion-measurement-api">Conversion Measurement API</a>, <a href="https://github.com/privacycg/private-click-measurement">Private Click Measurement</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/API/Storage_Access_API" rel="nofollow">Storage Access</a>, <a href="https://github.com/WICG/trust-token-api">Private State Tokens</a>, <a href="https://github.com/WICG/turtledove">TURTLEDOVE</a>, <a href="https://github.com/WICG/floc">FLoC</a>) and some remain (including cross-origin A/B experiments and user measurement). We propose a general-purpose storage API that can help to serve as common infrastructure for privacy preserving cross-site use cases.</p> <p dir="auto">Shared Storage is a key/value store that is partitioned by calling origin (but not top-frame site). The keys and values are strings. While it's possible to write to Shared Storage from nearly anywhere (including response headers!), it is only possible to read from Shared Storage in tightly controlled environments, such as a JavaScript worklet environment which is provided by Shared Storage. These worklets have no capability of communicating with the outside world. They have no network communication and no <code>postMessage</code>. The only way data can leave these worklets, is via privacy-preserving APIs.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Specification</h3><a id="user-content-specification" class="anchor" aria-label="Permalink: Specification" href="#specification"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">See the <a href="https://wicg.github.io/shared-storage/" rel="nofollow">draft specification</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">APIs built on top of Shared Storage</h2><a id="user-content-apis-built-on-top-of-shared-storage" class="anchor" aria-label="Permalink: APIs built on top of Shared Storage" href="#apis-built-on-top-of-shared-storage"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This document only describes the core shared storage framework and infrastructure to store cross-site data privately and to read that data from within a secure worklet environment. APIs that use shared storage's data to produce some output are linked to below.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Private Aggregation</h3><a id="user-content-private-aggregation" class="anchor" aria-label="Permalink: Private Aggregation" href="#private-aggregation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <a href="https://github.com/patcg-individual-drafts/private-aggregation-api">Private Aggregation</a> API allows for aggregated histograms to be sent based on data read from shared storage. The histograms are differentially private.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Select URL</h3><a id="user-content-select-url" class="anchor" aria-label="Permalink: Select URL" href="#select-url"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <a href="https://github.com/WICG/shared-storage/blob/main/select-url.md">selectURL</a> API allows for content selection based on cross-site data. It takes 8 possible URLs as input and sends them to a worklet which selects from a small list of URLs. The chosen URL is stored in a fenced frame config as an opaque form that can only be read by a <a href="https://github.com/WICG/fenced-frame">fenced frame</a>; the embedder does not learn this information.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Demonstration</h2><a id="user-content-demonstration" class="anchor" aria-label="Permalink: Demonstration" href="#demonstration"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You can <a href="https://shared-storage-demo.web.app/" rel="nofollow">try out</a> Shared Storage along with some APIs built for it using Chrome 104+.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Example 1: Writing an experiment id to Shared Storage from a document</h3><a id="user-content-example-1-writing-an-experiment-id-to-shared-storage-from-a-document" class="anchor" aria-label="Permalink: Example 1: Writing an experiment id to Shared Storage from a document" href="#example-1-writing-an-experiment-id-to-shared-storage-from-a-document"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Since Shared Storage is meant for writing from anywhere, but reading is tightly constrained, it's not actually possible to know what you might have written to your storage from other sites. Is this the first time you've seen this user? Who knows! As such, <code>Shared Storage</code> provides some useful functions beyond just <code>set</code> to write to keys only if they're not already present, and to append to a value rather than overwrite it.</p> <p dir="auto">For example, let's say that you wanted to add a user to an experiment group, with a random assignment. But you want that group assignment to be sticky for the user across all of the sites that they visit that your third-party script is on. You may not know if you've ever written this key from this site before, but you certainly don't know if you've set it from another site. To solve this issue, utilize the <code>ignoreIfPresent</code> option.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="try { sharedStorage.set('group', Math.floor(Math.random() * 1000), { ignoreIfPresent: true }); } catch (error) { // Error handling }"><pre><span class="pl-k">try</span> <span class="pl-kos">{</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">set</span><span class="pl-kos">(</span><span class="pl-s">'group'</span><span class="pl-kos">,</span> <span class="pl-v">Math</span><span class="pl-kos">.</span><span class="pl-en">floor</span><span class="pl-kos">(</span><span class="pl-v">Math</span><span class="pl-kos">.</span><span class="pl-en">random</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">*</span> <span class="pl-c1">1000</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">ignoreIfPresent</span>: <span class="pl-c1">true</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">error</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Error handling</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">And <code>Shared Storage</code> will only write the value if the key is not already present.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Example 2: Writing to Shared Storage via a worklet</h3><a id="user-content-example-2-writing-to-shared-storage-via-a-worklet" class="anchor" aria-label="Permalink: Example 2: Writing to Shared Storage via a worklet" href="#example-2-writing-to-shared-storage-via-a-worklet"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In the event that <code>ignoreIfPresent</code> is not sufficient, and you need to read your existing <code>Shared Storage</code> data before adding new data, consider passing the information that you want to record to a worklet, and letting the worklet read the existing data and perform the write. Like so:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="try { const worklet = sharedStorage.createWorklet('https://site.example/writerWorklet.js'); worklet.run('write', {data: {group: Math.floor(Math.random() * 1000)}}); } catch (error) { // Error handling }"><pre><span class="pl-k">try</span> <span class="pl-kos">{</span> <span class="pl-k">const</span> <span class="pl-s1">worklet</span> <span class="pl-c1">=</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">createWorklet</span><span class="pl-kos">(</span><span class="pl-s">'https://site.example/writerWorklet.js'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">worklet</span><span class="pl-kos">.</span><span class="pl-en">run</span><span class="pl-kos">(</span><span class="pl-s">'write'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span><span class="pl-c1">data</span>: <span class="pl-kos">{</span><span class="pl-c1">group</span>: <span class="pl-v">Math</span><span class="pl-kos">.</span><span class="pl-en">floor</span><span class="pl-kos">(</span><span class="pl-v">Math</span><span class="pl-kos">.</span><span class="pl-en">random</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">*</span> <span class="pl-c1">1000</span><span class="pl-kos">)</span><span class="pl-kos">}</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">error</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Error handling</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">And your <code>writerWorklet.js</code> script would look like this: <code>writerWorklet.js</code></p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="class Writer { async run(data) { const existingGroup = sharedStorage.get('group'); if (!existingGroup) { cibst newGroup = data['group']; sharedStorage.set('group', newGroup); } } } register('write', Writer);"><pre><span class="pl-k">class</span> <span class="pl-v">Writer</span> <span class="pl-kos">{</span> <span class="pl-k">async</span> <span class="pl-en">run</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">const</span> <span class="pl-s1">existingGroup</span> <span class="pl-c1">=</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">get</span><span class="pl-kos">(</span><span class="pl-s">'group'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-c1">!</span><span class="pl-s1">existingGroup</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-s1">cibst</span> <span class="pl-s1">newGroup</span> <span class="pl-c1">=</span> <span class="pl-s1">data</span><span class="pl-kos">[</span><span class="pl-s">'group'</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">set</span><span class="pl-kos">(</span><span class="pl-s">'group'</span><span class="pl-kos">,</span> <span class="pl-s1">newGroup</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-en">register</span><span class="pl-kos">(</span><span class="pl-s">'write'</span><span class="pl-kos">,</span> <span class="pl-v">Writer</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Example 3: Writing to Shared Storage with response headers</h3><a id="user-content-example-3-writing-to-shared-storage-with-response-headers" class="anchor" aria-label="Permalink: Example 3: Writing to Shared Storage with response headers" href="#example-3-writing-to-shared-storage-with-response-headers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It may be faster and more convenient to write to Shared Storage directly from response headers than from JavaScript. This is encouraged in cases where data is coming from a server anyway as it's faster and less intensive than JavaScript methods if you're writing to an origin other than the current document's origin.</p> <p dir="auto">Response headers can be used on document, image, and fetch requests.</p> <p dir="auto">e.g.,:</p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<iframe src="https://site.example/iframe" sharedstoragewritable></iframe>"><pre><span class="pl-kos"><</span><span class="pl-ent">iframe</span> <span class="pl-c1">src</span>="<span class="pl-s">https://site.example/iframe</span>" <span class="pl-c1">sharedstoragewritable</span><span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">iframe</span><span class="pl-kos">></span></pre></div> <p dir="auto">The document request for "<a href="https://site.example/iframe" rel="nofollow">https://site.example/iframe</a>" will include a <code>Sec-Shared-Storage-Writable: ?1</code> request header. Any request with this header can have a corresponding <code>Shared-Storage-Write</code> response header that can write, like so:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Shared-Storage-Write: set;key="group";value="4";ignore_if_present"><pre><span class="pl-v">Shared</span><span class="pl-c1">-</span><span class="pl-v">Storage</span><span class="pl-c1">-</span><span class="pl-v">Write</span>: <span class="pl-k">set</span><span class="pl-kos">;</span><span class="pl-s1">key</span><span class="pl-c1">=</span><span class="pl-s">"group"</span><span class="pl-kos">;</span><span class="pl-s1">value</span><span class="pl-c1">=</span><span class="pl-s">"4"</span><span class="pl-kos">;</span><span class="pl-s1">ignore_if_present</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Example 4: Counting the number of views your content has received across sites</h3><a id="user-content-example-4-counting-the-number-of-views-your-content-has-received-across-sites" class="anchor" aria-label="Permalink: Example 4: Counting the number of views your content has received across sites" href="#example-4-counting-the-number-of-views-your-content-has-received-across-sites"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To count the number of times the user has viewed your third-party content, consider using the append option. Like so:</p> <p dir="auto">e.g.,:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="try { window.sharedStorage.append('count', '1'); } catch (error) { // Error handling }"><pre><span class="pl-k">try</span> <span class="pl-kos">{</span> <span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">append</span><span class="pl-kos">(</span><span class="pl-s">'count'</span><span class="pl-kos">,</span> <span class="pl-s">'1'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">error</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Error handling</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">Then, sometime later in your worklet, you can get the total count:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="class Counter { async run(data) { const countLog = data['count']; // e.g.,: '111111111' const count = countLog.length; // do something useful with this data (such as recording an aggregate histogram) here... } } register('count', Counter);"><pre><span class="pl-k">class</span> <span class="pl-v">Counter</span> <span class="pl-kos">{</span> <span class="pl-k">async</span> <span class="pl-en">run</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">const</span> <span class="pl-s1">countLog</span> <span class="pl-c1">=</span> <span class="pl-s1">data</span><span class="pl-kos">[</span><span class="pl-s">'count'</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-c">// e.g.,: '111111111'</span> <span class="pl-k">const</span> <span class="pl-s1">count</span> <span class="pl-c1">=</span> <span class="pl-s1">countLog</span><span class="pl-kos">.</span><span class="pl-c1">length</span><span class="pl-kos">;</span> <span class="pl-c">// do something useful with this data (such as recording an aggregate histogram) here...</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-en">register</span><span class="pl-kos">(</span><span class="pl-s">'count'</span><span class="pl-kos">,</span> <span class="pl-v">Counter</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Goals</h2><a id="user-content-goals" class="anchor" aria-label="Permalink: Goals" href="#goals"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This API intends to support the storage and access needs for a wide array of cross-site data use cases. This prevents each API from having to create its own bespoke storage APIs.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Related work</h2><a id="user-content-related-work" class="anchor" aria-label="Permalink: Related work" href="#related-work"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">There have been multiple privacy proposals (<a href="https://github.com/AdRoll/privacy/blob/main/SPURFOWL.md">SPURFOWL</a>, <a href="https://github.com/1plusX/swan">SWAN</a>, <a href="https://github.com/csharrison/aggregate-reporting-api">Aggregated Reporting</a>) that have a notion of write-only storage with limited output. Shared Storage allows for each of those use cases, with only one storage API which is easier for developers to learn and requires less browser code. We’d also like to acknowledge the <a href="https://github.com/WICG/kv-storage">KV Storage</a> explainer, to which we turned for API-shape inspiration.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Proposed API surface</h2><a id="user-content-proposed-api-surface" class="anchor" aria-label="Permalink: Proposed API surface" href="#proposed-api-surface"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Outside of worklets (e.g., places where writing can happen)</h3><a id="user-content-outside-of-worklets-eg-places-where-writing-can-happen" class="anchor" aria-label="Permalink: Outside of worklets (e.g., places where writing can happen)" href="#outside-of-worklets-eg-places-where-writing-can-happen"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The modifier methods (<code>set</code>, <code>append</code>, <code>delete</code>, <code>clear</code>, and <code>batchUpdate</code>) should be made generally available across most any context. That includes top-level documents, iframes, shared storage worklets, Protected Audience worklets, service workers, dedicated workers, etc.</p> <p dir="auto">The shared storage worklet invocation methods (<code>addModule</code>, <code>createWorklet</code>, and <code>run</code>) are available within document contexts.</p> <ul dir="auto"> <li><code>window.sharedStorage.set(key, value, options)</code> <ul dir="auto"> <li>Sets <code>key</code>’s entry to <code>value</code>.</li> <li><code>key</code> and <code>value</code> are both strings.</li> <li>Options include: <ul dir="auto"> <li><code>ignoreIfPresent</code> (defaults to false): if true, a <code>key</code>’s entry is not updated if the <code>key</code> already exists. The embedder is not notified which occurred.</li> <li><code>withLock</code>: acquire a lock on the designated resource before executing. See <a href="#locking-for-modifier-methods">Locking for modifier methods</a> for details.</li> </ul> </li> </ul> </li> <li><code>window.sharedStorage.append(key, value, options)</code> <ul dir="auto"> <li>Appends <code>value</code> to the entry for <code>key</code>. Equivalent to <code>set</code> if the <code>key</code> is not present.</li> <li>Options include: <ul dir="auto"> <li><code>withLock</code>: acquire a lock on the designated resource before executing. See <a href="#locking-for-modifier-methods">Locking for modifier methods</a> for details.</li> </ul> </li> </ul> </li> <li><code>window.sharedStorage.delete(key, options)</code> <ul dir="auto"> <li>Deletes the entry at the given <code>key</code>.</li> <li>Options include: <ul dir="auto"> <li><code>withLock</code>: acquire a lock on the designated resource before executing. See <a href="#locking-for-modifier-methods">Locking for modifier methods</a> for details.</li> </ul> </li> </ul> </li> <li><code>window.sharedStorage.clear(options)</code> <ul dir="auto"> <li>Deletes all entries.</li> <li>Options include: <ul dir="auto"> <li><code>withLock</code>: acquire a lock on the designated resource before executing. See <a href="#locking-for-modifier-methods">Locking for modifier methods</a> for details.</li> </ul> </li> </ul> </li> <li><code>window.sharedStorage.batchUpdate(methods, options)</code> <ul dir="auto"> <li>Execute <code>methods</code> in order.</li> <li><code>methods</code> is an array of method objects defining the operations to perform. Each object must be one of the following types: <code>SharedStorageSetMethod</code>, <code>SharedStorageAppendMethod</code>, <code>SharedStorageDeleteMethod</code>, or <code>SharedStorageClearMethod</code>. Each method object's constructor accepts the same parameters as the corresponding individual method (e.g., <code>set</code>, <code>append</code>, <code>delete</code>, <code>clear</code>).</li> <li>Options include: <ul dir="auto"> <li><code>withLock</code>: acquire a lock on the designated resource before executing. See <a href="#locking-for-modifier-methods">Locking for modifier methods</a> for details.</li> </ul> </li> <li>This method, with the <code>withLock</code> option, allows multiple modifier methods to be executed atomically, enabling use cases where a website needs to maintain consistency while updating data organized across multiple keys.</li> </ul> </li> <li><code>window.sharedStorage.worklet.addModule(url, options)</code> <ul dir="auto"> <li>Loads and adds the module to the worklet (i.e. for registering operations). The handling should follow the <a href="https://html.spec.whatwg.org/multipage/worklets.html#dom-worklet-addmodule" rel="nofollow">worklet standard</a>, unless clarified otherwise below.</li> <li>This method can only be invoked once per worklet. This is because after the initial script loading, shared storage data (for the invoking origin) will be made accessible inside the worklet environment, which can be leaked via subsequent <code>addModule()</code> (e.g. via timing).</li> <li><code>url</code>'s origin need not match that of the context that invoked <code>addModule(url)</code>. <ul dir="auto"> <li>If <code>url</code> is cross-origin to the invoking context, the worklet will use the invoking context's origin as its partition origin for accessing shared storage data and for budget checking and withdrawing.</li> <li>Also, for a cross-origin<code>url</code>, the CORS protocol applies.</li> </ul> </li> <li>Redirects are not allowed.</li> </ul> </li> <li><code>window.sharedStorage.worklet.run(name, options)</code> <ul dir="auto"> <li>Runs the operation previously registered by <code>register()</code> with matching <code>name</code>. Does nothing if there’s no matching operation.</li> <li>Returns a promise that resolves to <code>undefined</code> when the operation is queued:</li> <li>Options can include: <ul dir="auto"> <li><code>data</code>, an arbitrary serializable object passed to the worklet.</li> <li><code>keepAlive</code> (defaults to false), a boolean denoting whether the worklet should be retained after it completes work for this call. <ul dir="auto"> <li>If <code>keepAlive</code> is false or not specified, the worklet will shutdown as soon as the operation finishes and subsequent calls to it will fail.</li> <li>To keep the worklet alive throughout multiple calls to <code>run()</code>, each of those calls must include <code>keepAlive: true</code> in the <code>options</code> dictionary.</li> </ul> </li> </ul> </li> </ul> </li> <li><code>window.sharedStorage.run(name, options)</code> <ul dir="auto"> <li>The behavior is identical to <code>window.sharedStorage.worklet.run(name, options)</code>.</li> </ul> </li> <li><code>window.sharedStorage.createWorklet(url, options)</code> <ul dir="auto"> <li>Creates a new worklet, and loads and adds the module to the worklet (similar to the handling for <code>window.sharedStorage.worklet.addModule(url, options)</code>).</li> <li>By default, the worklet uses the invoking context's origin as its partition origin for accessing shared storage data and for budget checking and withdrawing. <ul dir="auto"> <li>To instead use the worklet script origin (i.e. <code>url</code>'s origin) as the partition origin for accessing shared storage, pass the <code>dataOrigin</code> option with "script-origin" as its value in the <code>options</code> dictionary.</li> <li>To use a custom origin as the partition origin for accessing shared storage, pass the <code>dataOrigin</code> option with the serialized partition origin (i.e. the <a href="https://url.spec.whatwg.org/#url-serializing" rel="nofollow">URL serialization</a> of a URL with the same scheme, host, and port as the partition origin, but whose other components are empty) as its value in the <code>options</code> dictionary.</li> <li>Supported values for the <code>dataOrigin</code> option, if used, are the keywords "script-origin" and "context-origin", as well as any valid serialized HTTPS origin, e.g. "<a href="https://custom-data-origin.example" rel="nofollow">https://custom-data-origin.example</a>". <ul dir="auto"> <li>"script-origin" designates the worklet script origin as the data partition origin.</li> <li>"context-origin" (default) designates the invoking context origin as the data partition origin.</li> <li>A serialized HTTPS origin designates itself as the data partition origin.</li> </ul> </li> </ul> </li> <li>When a valid serialized HTTPS URL is passed as the value for <code>dataOrigin</code> and the parsed URL's origin is cross-origin to both the invoking context's origin and the worklet script's origin, the parsed URL's origin must host a JSON file at the <a name="user-content-well-known">/.well-known/</a> path "/.well-known/shared-storage/trusted-origins" with an array of dictionaries, each with keys <code>scriptOrigin</code> and <code>contextOrigin</code>. The values for these keys should be either a string or an array of strings. <ul dir="auto"> <li>A string value should be either a serialized origin or <code>"*"</code>, where <code>"*"</code> matches all origins.</li> <li>A value that is an array of strings should be a list of serialized origins.</li> <li>For example, the following JSON at "<a href="https://custom-data-origin.example/.well-known/shared-storage/trusted-origins" rel="nofollow">https://custom-data-origin.example/.well-known/shared-storage/trusted-origins</a>" allows script from "<a href="https://script-origin.a.example" rel="nofollow">https://script-origin.a.example</a>" to process "<a href="https://custom-data-origin.example%22's" rel="nofollow">https://custom-data-origin.example"'s</a> shared storage data when <code>createWorklet</code> is invoked in the context "<a href="https://context-origin.a.example" rel="nofollow">https://context-origin.a.example</a>", it allows script from "<a href="https://script-origin.b.example" rel="nofollow">https://script-origin.b.example</a>" to process "<a href="https://custom-data-origin.example%22's" rel="nofollow">https://custom-data-origin.example"'s</a> shared storage data when <code>createWorklet</code> is invoked in the context of either "<a href="https://context-origin.a.example" rel="nofollow">https://context-origin.a.example</a>" or "<a href="https://context-origin.b.example" rel="nofollow">https://context-origin.b.example</a>", and it also allows script from "<a href="https://script-origin.c.example" rel="nofollow">https://script-origin.c.example</a>" and "<a href="https://script-origin.d.example" rel="nofollow">https://script-origin.d.example</a>" to process "<a href="https://custom-data-origin.example%22's" rel="nofollow">https://custom-data-origin.example"'s</a> shared storage data when <code>createWorklet</code> is invoked in any origin's context. <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" [ { scriptOrigin: "https://script-origin.a.example", contextOrigin: "https://context-origin.a.example" }, { scriptOrigin: "https://script-origin.b.example", contextOrigin: ["https://context-origin.a.example", "https://context-origin.b.example"] }, { scriptOrigin: ["https://script-origin.c.example", "https://script-origin.d.example"], contextOrigin: "*" } ]"><pre class="notranslate"><code> [ { scriptOrigin: "https://script-origin.a.example", contextOrigin: "https://context-origin.a.example" }, { scriptOrigin: "https://script-origin.b.example", contextOrigin: ["https://context-origin.a.example", "https://context-origin.b.example"] }, { scriptOrigin: ["https://script-origin.c.example", "https://script-origin.d.example"], contextOrigin: "*" } ] </code></pre></div> </li> </ul> </li> <li>The object that the returned Promise resolves to has the same type with the implicitly constructed <code>window.sharedStorage.worklet</code>. However, for a worklet created via <code>window.sharedStorage.createWorklet(url, options)</code>, only <code>selectURL()</code> and <code>run()</code> are available, whereas calling <code>addModule()</code> will throw an error. This is to prevent leaking shared storage data via <code>addModule()</code>, similar to the reason why <code>addModule()</code> can only be invoked once on the implicitly constructed <code>window.sharedStorage.worklet</code>.</li> <li>Redirects are not allowed.</li> <li>When the module script's URL's origin is cross-origin with the worklet's creator window's origin and when <code>dataOrigin</code> is "script-origin" (or when <code>dataOrigin</code> is a valid serialized HTTPS URL that is same-origin to the worklet's script's origin), the check for trusted origins at the <a href="#well-known">/.well-known/ path</a> will be skipped, and a <code>Shared-Storage-Cross-Origin-Worklet-Allowed: ?1</code> response header is required instead. <ul dir="auto"> <li>The script server must carefully consider the security risks of allowing worklet creation by other origins (via <code>Shared-Storage-Cross-Origin-Worklet-Allowed: ?1</code> and CORS), because this will also allow the worklet creator to run subsequent operations, and a malicious actor could poison and use up the worklet origin's budget.</li> <li>Note that for the script server's infomation, the request header "Sec-Shared-Storage-Data-Origin" will be included with the value of the serialized data partition origin to be used if the data partition origin is cross-origin to the invoking context's origin.</li> </ul> </li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">In the worklet, during <code>sharedStorage.worklet.addModule(url, options)</code> or <code>sharedStorage.createWorklet(url, options)</code></h3><a id="user-content-in-the-worklet-during-sharedstorageworkletaddmoduleurl-options-or-sharedstoragecreateworkleturl-options" class="anchor" aria-label="Permalink: In the worklet, during sharedStorage.worklet.addModule(url, options) or sharedStorage.createWorklet(url, options)" href="#in-the-worklet-during-sharedstorageworkletaddmoduleurl-options-or-sharedstoragecreateworkleturl-options"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><code>register(name, operation)</code> <ul dir="auto"> <li>Registers a shared storage worklet operation with the provided <code>name</code>.</li> <li><code>operation</code> should be a class with an async <code>run()</code> method. <ul dir="auto"> <li>For the operation to work with <code>sharedStorage.run()</code>, <code>run()</code> should take <code>data</code> as an argument and return nothing. Any return value is <a href="#default">ignored</a>.</li> </ul> </li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">In the worklet, during an operation</h3><a id="user-content-in-the-worklet-during-an-operation" class="anchor" aria-label="Permalink: In the worklet, during an operation" href="#in-the-worklet-during-an-operation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><code>sharedStorage.get(key)</code> <ul dir="auto"> <li>Returns a promise that resolves into the <code>key</code>‘s entry or an empty string if the <code>key</code> is not present.</li> </ul> </li> <li><code>sharedStorage.length()</code> <ul dir="auto"> <li>Returns a promise that resolves into the number of keys.</li> </ul> </li> <li><code>sharedStorage.keys()</code> and <code>sharedStorage.entries()</code> <ul dir="auto"> <li>Returns an async iterator for all the stored keys or [key, value] pairs, sorted in the underlying key order.</li> </ul> </li> <li><code>sharedStorage.set(key, value, options)</code>, <code>sharedStorage.append(key, value, options)</code>, <code>sharedStorage.delete(key, options)</code>, <code>sharedStorage.clear(options)</code>, and <code>sharedStorage.batchUpdate(methods, options)</code> <ul dir="auto"> <li>Same as outside the worklet, except that the promise returned only resolves into <code>undefined</code> when the operation has completed.</li> </ul> </li> <li><code>sharedStorage.context</code> <ul dir="auto"> <li>From inside a worklet created inside a <a href="https://github.com/wicg/fenced-frame/">fenced frame</a>, returns a string of contextual information, if any, that the embedder had written to the <a href="https://github.com/wicg/fenced-frame/">fenced frame</a>'s <a href="https://github.com/WICG/fenced-frame/blob/master/explainer/fenced_frame_config.md">FencedFrameConfig</a> before the <a href="https://github.com/wicg/fenced-frame/">fenced frame</a>'s navigation.</li> <li>If no contextual information string had been written for the given frame, returns undefined.</li> </ul> </li> <li><code>interestGroups()</code> <ul dir="auto"> <li>Returns a promise that resolves into an array of <code>StorageInterestGroup</code>. A <code>StorageInterestGroup</code> is a dictionary that extends the <a href="https://wicg.github.io/turtledove/#dictdef-auctionadinterestgroup" rel="nofollow">AuctionAdInterestGroup</a> dictionary with the following attributes: <ul dir="auto"> <li>unsigned long long <code>joinCount</code></li> <li>unsigned long long <code>bidCount</code></li> <li>sequence<<a href="https://wicg.github.io/turtledove/#typedefdef-previouswin" rel="nofollow">PreviousWin</a>> <code>prevWinsMs</code></li> <li>USVString <code>joiningOrigin</code></li> <li>long long <code>timeSinceGroupJoinedMs</code></li> <li>long long <code>lifetimeRemainingMs</code></li> <li>long long <code>timeSinceLastUpdateMs</code></li> <li>long long <code>timeUntilNextUpdateMs</code></li> <li>unsigned long long <code>estimatedSize</code> <ul dir="auto"> <li>The approximate size of the contents of this interest group, in bytes.</li> </ul> </li> </ul> </li> <li>The <a href="https://wicg.github.io/turtledove/#dictdef-auctionadinterestgroup" rel="nofollow">AuctionAdInterestGroup</a>'s <a href="https://wicg.github.io/turtledove/#dom-auctionadinterestgroup-lifetimems" rel="nofollow">lifetimeMs</a> field will remain unset. It's no longer applicable at query time and is replaced with attributes <code>timeSinceGroupJoinedMs</code> and <code>lifetimeRemainingMs</code>.</li> <li>This API provides the Protected Audience buyer with a better picture of what's happening with their users, allowing for Private Aggregation reports.</li> </ul> </li> <li><code>navigator.locks.request(resource, callback)</code> and <code>navigator.locks.request(resource, options, callback)</code> <ul dir="auto"> <li>Acquires a lock on <code>resource</code> and invokes <code>callback</code> with the lock held. <code>navigator.locks</code> returns a <code>LockManager</code> as it does in a <code>Window</code>. See the <a href="https://w3c.github.io/web-locks/#dom-lockmanager-request" rel="nofollow">request</a> method in Web Locks API for details.</li> <li>Lock Scope: shared storage locks are partitioned by the shared storage data origin, and are independent of any locks obtained via <code>navigator.locks.request</code> in a <code>Window</code> or <code>Worker</code> context. This prevents contention between shared storage locks and other locks, ensuring that shared storage data cannot be inadvertently leaked.</li> </ul> </li> <li>Functions exposed by APIs built on top of Shared Storage such as the <a href="https://github.com/alexmturner/private-aggregation-api">Private Aggregation API</a>, e.g. <code>privateAggregation.contributeToHistogram()</code>. <ul dir="auto"> <li>These functions construct and then send an aggregatable report for the private, secure <a href="https://github.com/WICG/conversion-measurement-api/blob/main/AGGREGATION_SERVICE_TEE.md">aggregation service</a>.</li> <li>The report contents (e.g. key, value) are encrypted and sent after a delay. The report can only be read by the service and processed into aggregate statistics.</li> <li>After a Shared Storage operation has been running for 5 seconds, Private Aggregation contributions are timed out. Any future contributions are ignored and contributions already made are sent in a report as if the Shared Storage operation had completed.</li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">From response headers</h3><a id="user-content-from-response-headers" class="anchor" aria-label="Permalink: From response headers" href="#from-response-headers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><code>batchUpdate()</code> can be triggered via the HTTP response header <code>Shared-Storage-Write</code>.</li> <li>This may provide a large performance improvement over creating a cross-origin iframe and writing from there, if a network request is otherwise required.</li> <li><code>Shared-Storage-Write</code> is a <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-lists" rel="nofollow">List Structured Header</a>. <ul dir="auto"> <li>Each member of the <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-lists" rel="nofollow">List</a> is a <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-tokens" rel="nofollow">Token Item</a> denoting either 1) the individual modifier method (<code>set</code>, <code>append</code>, <code>delete</code>, <code>clear</code>), with any arguments for the method as associated <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-parameters" rel="nofollow">Parameters</a>, or 2) the options to apply to the whole batch, with any individual options as associated <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-parameters" rel="nofollow">Parameters</a>. A string type argument or option (<code>key</code>, <code>value</code>, <code>with_lock</code>) can take the form of a <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-tokens" rel="nofollow">Token Item</a> or a <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-strings" rel="nofollow">String Item</a> or a <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences" rel="nofollow">Byte Sequence Item</a>. A boolean type option (<code>ignore_if_present</code>) can take the form of a <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-booleans" rel="nofollow">Boolean Item</a>.</li> <li>The modifier methods <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-items" rel="nofollow">Items</a> in the <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-lists" rel="nofollow">List</a> are handled in the order they appear.</li> <li>If multiple <code>options</code> <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-items" rel="nofollow">Items</a> appear in the <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-lists" rel="nofollow">List</a>, the last one will be used.</li> <li>The individual modifier methods correspond to <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-items" rel="nofollow">Items</a> as follows: <ul dir="auto"> <li><code>set(<key>, <value>, {ignoreIfPresent: true})</code> ←→ <code>set;key=<key>;value=<value>;ignore_if_present</code></li> <li><code>set(<key>, <value>, {ignoreIfPresent: false})</code> ←→ <code>set;key=<key>;value=<value>;ignore_if_present=?0</code></li> <li><code>set(<key>, <value>, {withLock: <resource>})</code> ←→ <code>set;key=<key>;value=<value>;with_lock=<resource></code></li> <li><code>set(<key>, <value>)</code> ←→ <code>set;key=<key>;value=<value></code></li> <li><code>append(<key>, <value>)</code> ←→ <code>append;key=<key>;value=<value></code></li> <li><code>delete(<key>)</code> ←→ <code>delete;key=<key></code></li> <li><code>clear()</code> ←→ <code>clear</code></li> </ul> </li> <li>The <code>batchUpdate()</code> options corresponds to an <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-items" rel="nofollow">Item</a> as follows: <ul dir="auto"> <li><code>{withLock: <resource>}</code> ←→ <code>options;with_lock=<resource></code></li> </ul> </li> <li>Example 1: Single Update <ul dir="auto"> <li>Header value: <code>set;key="123";value="456";ignore_if_present</code>.</li> <li>JavaScript equivalent: <code>sharedStorage.batchUpdate([new SharedStorageSetMethod("123", "456", {ignoreIfPresent: true})])</code>. Note that this is also equivalent to: <code>sharedStorage.set("123", "456", {ignoreIfPresent: true})</code>.</li> </ul> </li> <li>Example 2: Batch Update with Lock <ul dir="auto"> <li>Header value: <code>set;key="123";value="456";ignore_if_present, append;key=abc;value=def, options;with_lock="report-lock"</code>.</li> <li>JavaScript equivalent: <code>sharedStorage.batchUpdate([new SharedStorageSetMethod("123", "456", {ignoreIfPresent: true}), new SharedStorageAppendMethod("abc", "def")], { withLock: "report-lock" })</code>.</li> </ul> </li> <li><code><key></code> and <code><value></code> <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-parameters" rel="nofollow">Parameters</a> are of type <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-strings" rel="nofollow">String</a> or <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences" rel="nofollow">Byte Sequence</a>. <ul dir="auto"> <li>Note that <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-strings" rel="nofollow">Strings</a> are defined as zero or more <a href="https://www.rfc-editor.org/rfc/rfc20.html" rel="nofollow">printable ASCII characters</a>, and this excludes tabs, newlines, carriage returns, and so forth.</li> <li>To pass a key and/or value that contains non-ASCII and/or non-printable <a href="https://www.rfc-editor.org/rfc/rfc3629.html" rel="nofollow">UTF-8</a> characters, specify it as a <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences" rel="nofollow">Byte Sequence</a>. <ul dir="auto"> <li>A <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences" rel="nofollow">Byte Sequence</a> is delimited with colons and encoded using <a href="https://www.rfc-editor.org/rfc/rfc4648.html" rel="nofollow">base64</a>.</li> <li>The sequence of bytes obtained by decoding the <a href="https://www.rfc-editor.org/rfc/rfc4648.html" rel="nofollow">base64</a> from the <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences" rel="nofollow">Byte Sequence</a> must be valid <a href="https://www.rfc-editor.org/rfc/rfc3629.html" rel="nofollow">UTF-8</a>.</li> <li>For example: <ul dir="auto"> <li><code>:aGVsbG8K:</code> encodes "hello\n" in a <a href="https://www.rfc-editor.org/rfc/rfc3629.html" rel="nofollow">UTF-8</a> <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences" rel="nofollow">Byte Sequence</a> (where "\n" is the newline character).</li> <li><code>:8J+YgA==:</code> encodes "😀" in a <a href="https://www.rfc-editor.org/rfc/rfc3629.html" rel="nofollow">UTF-8</a> <a href="https://www.rfc-editor.org/rfc/rfc8941.html#name-byte-sequences" rel="nofollow">Byte Sequence</a>.</li> </ul> </li> <li>Remember that results returned via <code>get()</code> are <a href="https://www.rfc-editor.org/rfc/rfc2781.html" rel="nofollow">UTF-16</a> <a href="https://webidl.spec.whatwg.org/#idl-DOMString" rel="nofollow">DOMStrings</a>.</li> </ul> </li> </ul> </li> </ul> </li> <li>Modifying shared storage via response headers requires a prior opt-in via a corresponding HTTP request header <code>Sec-Shared-Storage-Writable: ?1</code>.</li> <li>The request header can be sent along with <code>fetch</code> requests via specifying an option: <code>fetch(<url>, {sharedStorageWritable: true})</code>.</li> <li>The request header can alternatively be sent on document or image requests either <ul dir="auto"> <li>via specifying a boolean content attribute, e.g.: <ul dir="auto"> <li><code><iframe src=[url] sharedstoragewritable></iframe></code></li> <li><code><img src=[url] sharedstoragewritable></code></li> </ul> </li> <li>or via an equivalent boolean IDL attribute, e.g.: <ul dir="auto"> <li><code>iframe.sharedStorageWritable = true</code></li> <li><code>img.sharedStorageWritable = true</code>.</li> </ul> </li> </ul> </li> <li>Redirects will be followed, and the request header will be sent to the host server for the redirect URL.</li> <li>The origin used for Shared Storage is that of the server that sends the <code>Shared-Storage-Write</code> response header(s). <ul dir="auto"> <li>If there are no redirects, this will be the origin of the request URL.</li> <li>If there are redirects, the origin of the redirect URL that is accompanied by the <code>Shared-Storage-Write</code> response header(s) will be used.</li> </ul> </li> <li>The response header will only be honored if the corresponding request included the request header: <code>Sec-Shared-Storage-Writable: ?1</code>.</li> <li>See example usage below.</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Locking for Modifier Methods</h3><a id="user-content-locking-for-modifier-methods" class="anchor" aria-label="Permalink: Locking for Modifier Methods" href="#locking-for-modifier-methods"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">All modifier methods (<code>set</code>, <code>append</code>, <code>delete</code>, <code>clear</code>, <code>batchUpdate</code>), whether invoked from JavaScript or from response headers, accept a <code>withLock: <resource></code> option. This option instructs the method to acquire a lock on the designated resource before executing.</p> <p dir="auto">The locks requested this way are partitioned by the shared storage data origin, and are independent of any locks obtained via <code>navigator.locks.request</code> in a Window or Worker context. Note that they share the same scope with the locks obtained via <code>navigator.locks.request</code> in the SharedStorageWorklet context.</p> <p dir="auto">Unlike <code>navigator.locks.request</code>, which offers various configuration options, the locks requested this way always use the default settings:</p> <ul dir="auto"> <li><code>mode: "exclusive"</code>: The lock is never shared with other locks.</li> <li><code>steal: false</code>: The lock will not preempt other locks.</li> <li><code>ifAvailable: false</code>: If the lock is currently held by others, keep waiting and don't skip.</li> </ul> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Example: Report on Multiple Keys</h4><a id="user-content-example-report-on-multiple-keys" class="anchor" aria-label="Permalink: Example: Report on Multiple Keys" href="#example-report-on-multiple-keys"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This example uses a lock to ensure that the read and delete operations inside the worklet runs atomically, preventing interference from the write operations outside the worklet.</p> <p dir="auto">Window context:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="try { sharedStorage.batchUpdate([ new SharedStorageSetMethod('key0', calculateValueFor('key0')), new SharedStorageSetMethod('key1', calculateValueFor('key1')) ], { withLock: 'report-lock' }); await sharedStorage.worklet.addModule('report-on-multiple-keys-script.js'); await sharedStorage.worklet.run('report-on-multiple-keys'); } catch (error) { // Handle error. }"><pre><span class="pl-k">try</span> <span class="pl-kos">{</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">batchUpdate</span><span class="pl-kos">(</span><span class="pl-kos">[</span> <span class="pl-k">new</span> <span class="pl-v">SharedStorageSetMethod</span><span class="pl-kos">(</span><span class="pl-s">'key0'</span><span class="pl-kos">,</span> <span class="pl-en">calculateValueFor</span><span class="pl-kos">(</span><span class="pl-s">'key0'</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">SharedStorageSetMethod</span><span class="pl-kos">(</span><span class="pl-s">'key1'</span><span class="pl-kos">,</span> <span class="pl-en">calculateValueFor</span><span class="pl-kos">(</span><span class="pl-s">'key1'</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">]</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">withLock</span>: <span class="pl-s">'report-lock'</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">await</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-c1">worklet</span><span class="pl-kos">.</span><span class="pl-en">addModule</span><span class="pl-kos">(</span><span class="pl-s">'report-on-multiple-keys-script.js'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">await</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-c1">worklet</span><span class="pl-kos">.</span><span class="pl-en">run</span><span class="pl-kos">(</span><span class="pl-s">'report-on-multiple-keys'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">error</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Handle error.</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">In the worklet script (<code>report-on-multiple-keys-script.js</code>):</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="class ReportOnMultipleKeysOperation { async run(data) { await navigator.locks.request("report-lock", async (lock) => { const value1 = await sharedStorage.get('key1'); const value2 = await sharedStorage.get('key2'); // Record an aggregate histogram with `value1` and `value2` here... await sharedStorage.delete('key1'); await sharedStorage.delete('key2'); }); } } register('report-on-multiple-keys', ReportOnMultipleKeysOperation);"><pre><span class="pl-k">class</span> <span class="pl-v">ReportOnMultipleKeysOperation</span> <span class="pl-kos">{</span> <span class="pl-k">async</span> <span class="pl-en">run</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">await</span> <span class="pl-s1">navigator</span><span class="pl-kos">.</span><span class="pl-c1">locks</span><span class="pl-kos">.</span><span class="pl-en">request</span><span class="pl-kos">(</span><span class="pl-s">"report-lock"</span><span class="pl-kos">,</span> <span class="pl-k">async</span> <span class="pl-kos">(</span><span class="pl-s1">lock</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-k">const</span> <span class="pl-s1">value1</span> <span class="pl-c1">=</span> <span class="pl-k">await</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">get</span><span class="pl-kos">(</span><span class="pl-s">'key1'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">value2</span> <span class="pl-c1">=</span> <span class="pl-k">await</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">get</span><span class="pl-kos">(</span><span class="pl-s">'key2'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Record an aggregate histogram with `value1` and `value2` here...</span> <span class="pl-k">await</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">delete</span><span class="pl-kos">(</span><span class="pl-s">'key1'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">await</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">delete</span><span class="pl-kos">(</span><span class="pl-s">'key2'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-en">register</span><span class="pl-kos">(</span><span class="pl-s">'report-on-multiple-keys'</span><span class="pl-kos">,</span> <span class="pl-v">ReportOnMultipleKeysOperation</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Caveat: Unexpected ordering</h4><a id="user-content-caveat-unexpected-ordering" class="anchor" aria-label="Permalink: Caveat: Unexpected ordering" href="#caveat-unexpected-ordering"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Modifier methods may block due to the lock, so may not execute in the order they appear in the code.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Resolve immediately. Internally, this may block to wait for the lock to be granted. sharedStorage.set('key0', 'value1', { withLock: 'resource0' }); // Resolve immediately. Internally, this will execute immediately. sharedStorage.set('key0', 'value2');"><pre><span class="pl-c">// Resolve immediately. Internally, this may block to wait for the lock to be granted.</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">set</span><span class="pl-kos">(</span><span class="pl-s">'key0'</span><span class="pl-kos">,</span> <span class="pl-s">'value1'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">withLock</span>: <span class="pl-s">'resource0'</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Resolve immediately. Internally, this will execute immediately.</span> <span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">set</span><span class="pl-kos">(</span><span class="pl-s">'key0'</span><span class="pl-kos">,</span> <span class="pl-s">'value2'</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">Developers should be mindful of this potential ordering issue.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Recommendations for lock usage</h3><a id="user-content-recommendations-for-lock-usage" class="anchor" aria-label="Permalink: Recommendations for lock usage" href="#recommendations-for-lock-usage"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If only a single key is involved, and the data is accessed at most once within and outside worklet, then the lock is unnecessary. This is because each access is inherently atomic. Example: <a href="https://github.com/WICG/shared-storage/blob/main/select-url.md#simple-example-consistent-ab-experiments-across-sites">A/B experiment</a>.</p> <p dir="auto">If the worklet performs both read and write on the same key, then the lock is likely necessary. Example: <a href="https://github.com/WICG/shared-storage/blob/main/select-url.md#a-second-example-ad-creative-selection-by-frequency">creative selection by frequency</a>.</p> <p dir="auto">If the logic involes updating data organized across multiple keys, then the lock is likely necessary. <a href="#example-report-on-multiple-keys">Example: Report on Multiple Keys</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Reporting embedder context</h3><a id="user-content-reporting-embedder-context" class="anchor" aria-label="Permalink: Reporting embedder context" href="#reporting-embedder-context"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In using the <a href="https://github.com/patcg-individual-drafts/private-aggregation-api">Private Aggregation API</a> to report on advertisements within <a href="https://github.com/wicg/fenced-frame/">fenced frames</a>, for instance, we might report on viewability, performance, which parts of the ad the user engaged with, the fact that the ad showed up at all, and so forth. But when reporting on the ad, it might be important to tie it to some contextual information from the embedding publisher page, such as an event-level ID.</p> <p dir="auto">In a scenario where the input URLs for the <a href="https://github.com/wicg/fenced-frame/">fenced frame</a> must be k-anonymous, e.g. if we create a <a href="https://github.com/WICG/fenced-frame/blob/master/explainer/fenced_frame_config.md">FencedFrameConfig</a> from running a <a href="https://github.com/WICG/turtledove/blob/main/FLEDGE.md#2-sellers-run-on-device-auctions">Protected Audience auction</a>, it would not be a good idea to rely on communicating the event-level ID to the <a href="https://github.com/wicg/fenced-frame/">fenced frame</a> by attaching an identifier to any of the input URLs, as this would make it difficult for any input URL(s) with the attached identifier to reach the k-anonymity threshold.</p> <p dir="auto">Instead, before navigating the <a href="https://github.com/wicg/fenced-frame/">fenced frame</a> to the auction's winning <a href="https://github.com/WICG/fenced-frame/blob/master/explainer/fenced_frame_config.md">FencedFrameConfig</a> <code>fencedFrameConfig</code>, we could write the event-level ID to <code>fencedFrameConfig</code> using <code>fencedFrameConfig.setSharedStorageContext()</code> as in the example below.</p> <p dir="auto">Subsequently, anything we've written to <code>fencedFrameConfig</code> through <code>setSharedStorageContext()</code> prior to the fenced frame's navigation to <code>fencedFrameConfig</code>, can be read via <code>sharedStorage.context</code> from inside a shared storage worklet created by the <a href="https://github.com/wicg/fenced-frame/">fenced frame</a>, or created by any of its same-origin children.</p> <p dir="auto">In the embedder page:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// See https://github.com/WICG/turtledove/blob/main/FLEDGE.md for how to write an auction config. const auctionConfig = { ... }; // Run a Protected Audience auction, setting the option to "resolveToConfig" to true. auctionConfig.resolveToConfig = true; const fencedFrameConfig = await navigator.runAdAuction(auctionConfig); // Write to the config any desired embedder contextual information as a string. fencedFrameConfig.setSharedStorageContext("My Event ID 123"); // Navigate the fenced frame to the config. document.getElementById('my-fenced-frame').config = fencedFrameConfig;"><pre><span class="pl-c">// See https://github.com/WICG/turtledove/blob/main/FLEDGE.md for how to write an auction config.</span> <span class="pl-k">const</span> <span class="pl-s1">auctionConfig</span> <span class="pl-c1">=</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-c">// Run a Protected Audience auction, setting the option to "resolveToConfig" to true.</span> <span class="pl-s1">auctionConfig</span><span class="pl-kos">.</span><span class="pl-c1">resolveToConfig</span> <span class="pl-c1">=</span> <span class="pl-c1">true</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">fencedFrameConfig</span> <span class="pl-c1">=</span> <span class="pl-k">await</span> <span class="pl-s1">navigator</span><span class="pl-kos">.</span><span class="pl-en">runAdAuction</span><span class="pl-kos">(</span><span class="pl-s1">auctionConfig</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Write to the config any desired embedder contextual information as a string.</span> <span class="pl-s1">fencedFrameConfig</span><span class="pl-kos">.</span><span class="pl-en">setSharedStorageContext</span><span class="pl-kos">(</span><span class="pl-s">"My Event ID 123"</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Navigate the fenced frame to the config.</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">getElementById</span><span class="pl-kos">(</span><span class="pl-s">'my-fenced-frame'</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-c1">config</span> <span class="pl-c1">=</span> <span class="pl-s1">fencedFrameConfig</span><span class="pl-kos">;</span></pre></div> <p dir="auto">In the fenced frame (<code>my-fenced-frame</code>):</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// Save some information we want to report that's only available inside the fenced frame. const frameInfo = { ... }; // Send a report using shared storage and private aggregation. try { await window.sharedStorage.worklet.addModule('report.js'); await window.sharedStorage.run('send-report', { data: { info: frameInfo }, }); } catch (error) { // Error handling }"><pre><span class="pl-c">// Save some information we want to report that's only available inside the fenced frame.</span> <span class="pl-k">const</span> <span class="pl-s1">frameInfo</span> <span class="pl-c1">=</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-c">// Send a report using shared storage and private aggregation.</span> <span class="pl-k">try</span> <span class="pl-kos">{</span> <span class="pl-k">await</span> <span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-c1">worklet</span><span class="pl-kos">.</span><span class="pl-en">addModule</span><span class="pl-kos">(</span><span class="pl-s">'report.js'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">await</span> <span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">run</span><span class="pl-kos">(</span><span class="pl-s">'send-report'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">data</span>: <span class="pl-kos">{</span> <span class="pl-c1">info</span>: <span class="pl-s1">frameInfo</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">error</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Error handling</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">In the worklet script (<code>report.js</code>):</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="class ReportingOperation { async run(data) { // Helper functions that map the embedder context to a predetermined bucket and the // frame info to an appropriately-scaled value. // See also https://github.com/patcg-individual-drafts/private-aggregation-api#examples function convertEmbedderContextToBucketId(context) { ... } function convertFrameInfoToValue(info) { ... } // The user agent sends the report to the reporting endpoint of the script's // origin (that is, the caller of `sharedStorage.run()`) after a delay. privateAggregation.contributeToHistogram({ bucket: convertEmbedderContextToBucketId(sharedStorage.context) , value: convertFrameInfoToValue(data.info) }); } } register('send-report', ReportingOperation);"><pre><span class="pl-k">class</span> <span class="pl-v">ReportingOperation</span> <span class="pl-kos">{</span> <span class="pl-k">async</span> <span class="pl-en">run</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Helper functions that map the embedder context to a predetermined bucket and the</span> <span class="pl-c">// frame info to an appropriately-scaled value.</span> <span class="pl-c">// See also https://github.com/patcg-individual-drafts/private-aggregation-api#examples</span> <span class="pl-k">function</span> <span class="pl-en">convertEmbedderContextToBucketId</span><span class="pl-kos">(</span><span class="pl-s1">context</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span> <span class="pl-k">function</span> <span class="pl-en">convertFrameInfoToValue</span><span class="pl-kos">(</span><span class="pl-s1">info</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span> <span class="pl-c">// The user agent sends the report to the reporting endpoint of the script's</span> <span class="pl-c">// origin (that is, the caller of `sharedStorage.run()`) after a delay.</span> <span class="pl-s1">privateAggregation</span><span class="pl-kos">.</span><span class="pl-en">contributeToHistogram</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c1">bucket</span>: <span class="pl-en">convertEmbedderContextToBucketId</span><span class="pl-kos">(</span><span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-c1">context</span><span class="pl-kos">)</span> <span class="pl-kos">,</span> <span class="pl-c1">value</span>: <span class="pl-en">convertFrameInfoToValue</span><span class="pl-kos">(</span><span class="pl-s1">data</span><span class="pl-kos">.</span><span class="pl-c1">info</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-en">register</span><span class="pl-kos">(</span><span class="pl-s">'send-report'</span><span class="pl-kos">,</span> <span class="pl-v">ReportingOperation</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Keeping a worklet alive for multiple operations</h3><a id="user-content-keeping-a-worklet-alive-for-multiple-operations" class="anchor" aria-label="Permalink: Keeping a worklet alive for multiple operations" href="#keeping-a-worklet-alive-for-multiple-operations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Callers may wish to run multiple worklet operations from the same context, e.g. they might select a URL and then send one or more aggregatable reports. To do so, they would need to use the <code>keepAlive: true</code> option when calling each of the worklet operations (except perhaps in the last call, if there was no need to extend the worklet's lifetime beyond that call).</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Writing to Shared Storage via response headers</h3><a id="user-content-writing-to-shared-storage-via-response-headers" class="anchor" aria-label="Permalink: Writing to Shared Storage via response headers" href="#writing-to-shared-storage-via-response-headers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">For an origin making changes to their Shared Storage data at a point when they do not need to read the data, an alternative to using the Shared Storage JavaScript API is to trigger setter and/or deleter operations via the HTTP response header <code>Shared-Storage-Write</code> as in the examples below.</p> <p dir="auto">In order to perform operations via response header, the origin must first opt-in via one of the methods below, causing the HTTP request header <code>Sec-Shared-Storage-Writable: ?1</code> to be added by the user agent if the request is eligible based on permissions checks.</p> <p dir="auto">An origin <code>a.example</code> could initiate such a request in multiple ways.</p> <p dir="auto">On the client side, to initiate the request:</p> <ol dir="auto"> <li><code>fetch()</code> option: <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="fetch("https://a.example/path/for/updates", {sharedStorageWritable: true});"><pre><span class="pl-en">fetch</span><span class="pl-kos">(</span><span class="pl-s">"https://a.example/path/for/updates"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span><span class="pl-c1">sharedStorageWritable</span>: <span class="pl-c1">true</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> </li> <li>Content attribute option with an iframe (also possible with an img): <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" <iframe src="https://a.example/path/for/updates" sharedstoragewritable></iframe> "><pre class="notranslate"><code> <iframe src="https://a.example/path/for/updates" sharedstoragewritable></iframe> </code></pre></div> </li> <li>IDL attribute option with an iframe (also possible with an img): <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let iframe = document.getElementById("my-iframe"); iframe.sharedStorageWritable = true; iframe.src = "https://a.example/path/for/updates";"><pre><span class="pl-k">let</span> <span class="pl-s1">iframe</span> <span class="pl-c1">=</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">getElementById</span><span class="pl-kos">(</span><span class="pl-s">"my-iframe"</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">iframe</span><span class="pl-kos">.</span><span class="pl-c1">sharedStorageWritable</span> <span class="pl-c1">=</span> <span class="pl-c1">true</span><span class="pl-kos">;</span> <span class="pl-s1">iframe</span><span class="pl-kos">.</span><span class="pl-c1">src</span> <span class="pl-c1">=</span> <span class="pl-s">"https://a.example/path/for/updates"</span><span class="pl-kos">;</span></pre></div> </li> </ol> <p dir="auto">On the server side, here is an example response header:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Shared-Storage-Write: clear, set;key="hello";value="world";ignore_if_present;with_lock="lock2", append;key="good";value="bye", delete;key="hello", set;key="all";value="done", options;with_lock="lock1""><pre lang="text" class="notranslate"><code>Shared-Storage-Write: clear, set;key="hello";value="world";ignore_if_present;with_lock="lock2", append;key="good";value="bye", delete;key="hello", set;key="all";value="done", options;with_lock="lock1" </code></pre></div> <p dir="auto">Sending the above response header would be equivalent to making the following call on the client side, from either the document or a worklet:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=" sharedStorage.batchUpdate([ new SharedStorageClearMethod(), new SharedStorageSetMethod("hello", "world", {ignoreIfPresent: true, withLock: "lock2"}), new SharedStorageAppendMethod("good", "bye"), new SharedStorageDeleteMethod("hello"), new SharedStorageSetMethod("all", "done") ], { withLock: "lock1" }) "><pre><span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">batchUpdate</span><span class="pl-kos">(</span><span class="pl-kos">[</span> <span class="pl-k">new</span> <span class="pl-v">SharedStorageClearMethod</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">SharedStorageSetMethod</span><span class="pl-kos">(</span><span class="pl-s">"hello"</span><span class="pl-kos">,</span> <span class="pl-s">"world"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span><span class="pl-c1">ignoreIfPresent</span>: <span class="pl-c1">true</span><span class="pl-kos">,</span> <span class="pl-c1">withLock</span>: <span class="pl-s">"lock2"</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">SharedStorageAppendMethod</span><span class="pl-kos">(</span><span class="pl-s">"good"</span><span class="pl-kos">,</span> <span class="pl-s">"bye"</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">SharedStorageDeleteMethod</span><span class="pl-kos">(</span><span class="pl-s">"hello"</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">SharedStorageSetMethod</span><span class="pl-kos">(</span><span class="pl-s">"all"</span><span class="pl-kos">,</span> <span class="pl-s">"done"</span><span class="pl-kos">)</span> <span class="pl-kos">]</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">withLock</span>: <span class="pl-s">"lock1"</span> <span class="pl-kos">}</span><span class="pl-kos">)</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Loading cross-origin worklet scripts</h3><a id="user-content-loading-cross-origin-worklet-scripts" class="anchor" aria-label="Permalink: Loading cross-origin worklet scripts" href="#loading-cross-origin-worklet-scripts"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">There are currently six (6) approaches to creating a worklet that loads cross-origin script. The partition origin for the worklet's shared storage data access depends on the approach.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Using the context origin as data partition origin</h4><a id="user-content-using-the-context-origin-as-data-partition-origin" class="anchor" aria-label="Permalink: Using the context origin as data partition origin" href="#using-the-context-origin-as-data-partition-origin"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The first three (3) approaches use the invoking context's origin as the partition origin for shared storage data access and the invoking context's site for shared storage budget withdrawals.</p> <ol dir="auto"> <li> <p dir="auto">Call <code>addModule()</code> with a cross-origin script.</p> <p dir="auto">In an "<a href="https://a.example" rel="nofollow">https://a.example</a>" context in the embedder page:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="await sharedStorage.worklet.addModule("https://b.example/worklet.js");"><pre class="notranslate"><code>await sharedStorage.worklet.addModule("https://b.example/worklet.js"); </code></pre></div> <p dir="auto">For any subsequent <code>run()</code> or <code>selectURL()</code> operation invoked on this worklet, the shared storage data for "<a href="https://a.example" rel="nofollow">https://a.example</a>" (i.e. the context origin) will be used.</p> </li> <li> <p dir="auto">Call <code>createWorklet()</code> with a cross-origin script.</p> <p dir="auto">In an "<a href="https://a.example" rel="nofollow">https://a.example</a>" context in the embedder page:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js");"><pre class="notranslate"><code>const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js"); </code></pre></div> <p dir="auto">For any subsequent <code>run()</code> or <code>selectURL()</code> operation invoked on this worklet, the shared storage data for "<a href="https://a.example" rel="nofollow">https://a.example</a>" (i.e. the context origin) will be used.</p> </li> <li> <p dir="auto">Call <code>createWorklet()</code> with a cross-origin script, setting its <code>dataOption</code> to the invoking context's origin.</p> <p dir="auto">In an "<a href="https://a.example" rel="nofollow">https://a.example</a>" context in the embedder page:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js", {dataOrigin: "context-origin"});"><pre class="notranslate"><code>const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js", {dataOrigin: "context-origin"}); </code></pre></div> <p dir="auto">For any subsequent <code>run()</code> or <code>selectURL()</code> operation invoked on this worklet, the shared storage data for "<a href="https://a.example" rel="nofollow">https://a.example</a>" (i.e. the context origin) will be used.</p> </li> </ol> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Using the worklet script origin as data partition origin</h4><a id="user-content-using-the-worklet-script-origin-as-data-partition-origin" class="anchor" aria-label="Permalink: Using the worklet script origin as data partition origin" href="#using-the-worklet-script-origin-as-data-partition-origin"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The fourth approach uses the worklet script's origin as the partition origin for shared storage data access and the worklet script's site for shared storage budget withdrawals.</p> <ol start="4" dir="auto"> <li> <p dir="auto">Call <code>createWorklet()</code> with a cross-origin script, setting its <code>dataOption</code> to the worklet script's origin.</p> <p dir="auto">In an "<a href="https://a.example" rel="nofollow">https://a.example</a>" context in the embedder page:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js", {dataOrigin: "script-origin"});"><pre class="notranslate"><code>const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js", {dataOrigin: "script-origin"}); </code></pre></div> <p dir="auto">For any subsequent <code>run()</code> or <code>selectURL()</code> operation invoked on this worklet, the shared storage data for "<a href="https://b.example" rel="nofollow">https://b.example</a>" (i.e. the worklet script origin) will be used, assuming that the worklet script's server confirmed opt-in with the required "Shared-Storage-Cross-Origin-Worklet-Allowed: ?1" response header.</p> </li> </ol> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Using a custom origin as data partition origin</h4><a id="user-content-using-a-custom-origin-as-data-partition-origin" class="anchor" aria-label="Permalink: Using a custom origin as data partition origin" href="#using-a-custom-origin-as-data-partition-origin"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The fifth through eighth approaches use a custom origin as the partition origin for shared storage data access and the custom origin's site for shared storage budget withdrawals.</p> <ol start="5" dir="auto"> <li> <p dir="auto">Call <code>createWorklet()</code>, setting its <code>dataOption</code> to a string whose value is the serialization of the custom origin.</p> <p dir="auto">In an "<a href="https://a.example" rel="nofollow">https://a.example</a>" context in the embedder page:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="const worklet = await sharedStorage.createWorklet("https://a.example/worklet.js", {dataOrigin: "https://custom.example"});"><pre class="notranslate"><code>const worklet = await sharedStorage.createWorklet("https://a.example/worklet.js", {dataOrigin: "https://custom.example"}); </code></pre></div> <p dir="auto">For any subsequent <code>run()</code> or <code>selectURL()</code> operation invoked on this worklet, the shared storage data for "<a href="https://custom.example" rel="nofollow">https://custom.example</a>" will be used, assuming that the <a href="#well-known">/.well-known/</a> JSON file at "<a href="https://custom.example/.well-known/shared-storage/trusted-origins" rel="nofollow">https://custom.example/.well-known/shared-storage/trusted-origins</a>" contains an array of dictionaries, where one of its dictionaries has</p> </li> </ol> <ul dir="auto"> <li>the <code>scriptOrigin</code> key's value matches "<a href="https://a.example" rel="nofollow">https://a.example</a>" (i.e. its value is "<a href="https://a.example" rel="nofollow">https://a.example</a>", <code>"*"</code>, or an array of strings containing "<a href="https://a.example" rel="nofollow">https://a.example</a>")</li> <li>the <code>contextOrigin</code> key's value matches "<a href="https://a.example" rel="nofollow">https://a.example</a>" (i.e. its value is "<a href="https://a.example" rel="nofollow">https://a.example</a>", <code>"*"</code>, or an array of strings containing "<a href="https://a.example" rel="nofollow">https://a.example</a>")</li> </ul> <ol start="6" dir="auto"> <li> <p dir="auto">Call <code>createWorklet()</code> with a cross-origin script, setting its <code>dataOption</code> to a string whose value is the serialization of the custom origin.</p> <p dir="auto">In an "<a href="https://a.example" rel="nofollow">https://a.example</a>" context in the embedder page:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js", {dataOrigin: "https://custom.example"});"><pre class="notranslate"><code>const worklet = await sharedStorage.createWorklet("https://b.example/worklet.js", {dataOrigin: "https://custom.example"}); </code></pre></div> <p dir="auto">For any subsequent <code>run()</code> or <code>selectURL()</code> operation invoked on this worklet, the shared storage data for "<a href="https://custom.example" rel="nofollow">https://custom.example</a>" will be used, assuming that the <a href="#well-known">/.well-known/</a> JSON file at "<a href="https://custom.example/.well-known/shared-storage/trusted-origins" rel="nofollow">https://custom.example/.well-known/shared-storage/trusted-origins</a>" contains an array of dictionaries, where one of its dictionaries has</p> </li> </ol> <ul dir="auto"> <li>the <code>scriptOrigin</code> key's value matches "<a href="https://b.example" rel="nofollow">https://b.example</a>" (i.e. its value is "<a href="https://b.example" rel="nofollow">https://b.example</a>", <code>"*"</code>, or an array of strings containing "<a href="https://b.example" rel="nofollow">https://b.example</a>")</li> <li>the <code>contextOrigin</code> key's value matches "<a href="https://a.example" rel="nofollow">https://a.example</a>" (i.e. its value is "<a href="https://a.example" rel="nofollow">https://a.example</a>", <code>"*"</code>, or an array of strings containing "<a href="https://a.example" rel="nofollow">https://a.example</a>")</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Error handling</h2><a id="user-content-error-handling" class="anchor" aria-label="Permalink: Error handling" href="#error-handling"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Note that the shared storage APIs may throw for several possible reasons. The following list of situations is not exhaustive, but, for example, the APIs may throw if the site invoking the API is not <a href="https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md">enrolled</a> and/or <a href="https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations">attested</a>, if the user has disabled shared storage in site settings, if the "shared-storage" or "shared-storage-select-url" permissions policy denies access, or if one of its arguments is invalid.</p> <p dir="auto">We recommend handling exceptions. This can be done by wrapping <code>async..await</code> calls to shared storage JS methods in <code>try...catch</code> blocks, or by following calls that are not awaited with <code>.catch</code>:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="try { await window.sharedStorage.worklet.addModule('worklet.js'); } catch (error) { // Handle error. }"><pre><span class="pl-k">try</span> <span class="pl-kos">{</span> <span class="pl-k">await</span> <span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-c1">worklet</span><span class="pl-kos">.</span><span class="pl-en">addModule</span><span class="pl-kos">(</span><span class="pl-s">'worklet.js'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-k">catch</span> <span class="pl-kos">(</span><span class="pl-s1">error</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Handle error.</span> <span class="pl-kos">}</span></pre></div> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="window.sharedStorage.worklet.addModule('worklet.js') .catch((error) => { // Handle error. });"><pre><span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-c1">worklet</span><span class="pl-kos">.</span><span class="pl-en">addModule</span><span class="pl-kos">(</span><span class="pl-s">'worklet.js'</span><span class="pl-kos">)</span> <span class="pl-kos">.</span><span class="pl-en">catch</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">error</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// Handle error.</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Worklets can outlive the associated document</h2><a id="user-content-worklets-can-outlive-the-associated-document" class="anchor" aria-label="Permalink: Worklets can outlive the associated document" href="#worklets-can-outlive-the-associated-document"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">After a document dies, the corresponding worklet (if running an operation) will continue to be kept alive for a maximum of two seconds to allow the pending operation(s) to execute. This gives more confidence that any end-of-page operations (e.g. reporting) are able to finish.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Permissions Policy</h2><a id="user-content-permissions-policy" class="anchor" aria-label="Permalink: Permissions Policy" href="#permissions-policy"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Shared storage methods can be disallowed by the "shared-storage" <a href="https://w3c.github.io/webappsec-permissions-policy/#policy-controlled-feature" rel="nofollow">policy-controlled feature</a>. Its default allowlist is * (i.e. every origin). APIs built on top of Shared Storage have their own specific permission policies, so it is possible to allow reading and writing of Shared Storage while disabling particular APIs.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Permissions Policy inside the shared storage worklet</h3><a id="user-content-permissions-policy-inside-the-shared-storage-worklet" class="anchor" aria-label="Permalink: Permissions Policy inside the shared storage worklet" href="#permissions-policy-inside-the-shared-storage-worklet"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The permissions policy inside the shared storage worklet will inherit the permissions policy of the associated document.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Data Retention Policy</h2><a id="user-content-data-retention-policy" class="anchor" aria-label="Permalink: Data Retention Policy" href="#data-retention-policy"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Each key is cleared after thirty days of last write (<code>set</code> or <code>append</code> call). If <code>ignoreIfPresent</code> is true, the last write time is updated.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Data Storage Limits</h2><a id="user-content-data-storage-limits" class="anchor" aria-label="Permalink: Data Storage Limits" href="#data-storage-limits"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Shared Storage is not subject to the quota manager, as that would leak information across sites. Therefore we limit the per-origin total key and value bytes to 5MB.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Privacy</h2><a id="user-content-privacy" class="anchor" aria-label="Permalink: Privacy" href="#privacy"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Shared Storage takes the following protective measures to prevent its stored data from being read by means other than via approved APIs (e.g., via side channels):</p> <ul dir="auto"> <li> <p dir="auto"><strong>Concealed Operation Time and Errors</strong>: When writing data or running worklet operations from the Window scope, the method returns immediately and will not expose errors that might arise from reading shared storage data.</p> </li> <li> <p dir="auto"><strong>Disabled Storage Access before Loading Finishes</strong>: Access to Shared Storage is disabled until a module script finishes loading. This prevents websites from using timing attacks to learn about the data stored in Shared Storage.</p> </li> <li> <p dir="auto"><strong>Isolated Locks</strong>: Locks requested for Shared Storage are completely separate from locks requested from the Window scope. This prevents information leakage through lock contention.</p> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Privacy-Preserving APIs</h3><a id="user-content-privacy-preserving-apis" class="anchor" aria-label="Permalink: Privacy-Preserving APIs" href="#privacy-preserving-apis"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The APIs that can read data from Shared Storage have their own privacy documentation.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Enrollment and Attestation</h3><a id="user-content-enrollment-and-attestation" class="anchor" aria-label="Permalink: Enrollment and Attestation" href="#enrollment-and-attestation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Use of Shared Storage requires <a href="https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md">enrollment</a> and <a href="https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations">attestation</a> via the <a href="https://github.com/privacysandbox/attestation/blob/main/README.md">Privacy Sandbox enrollment attestation model</a>.</p> <p dir="auto">For each method in the Shared Storage API surface, a check will be performed to determine whether the calling <a href="https://html.spec.whatwg.org/multipage/browsers.html#site" rel="nofollow">site</a> is <a href="https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md">enrolled</a> and <a href="https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations">attested</a>. In the case where the <a href="https://html.spec.whatwg.org/multipage/browsers.html#site" rel="nofollow">site</a> is not <a href="https://github.com/privacysandbox/attestation/blob/main/how-to-enroll.md">enrolled</a> and <a href="https://github.com/privacysandbox/attestation/blob/main/README.md#core-privacy-attestations">attested</a>, the promise returned by the method is rejected.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Possibilities for extension</h2><a id="user-content-possibilities-for-extension" class="anchor" aria-label="Permalink: Possibilities for extension" href="#possibilities-for-extension"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Interactions between worklets</h3><a id="user-content-interactions-between-worklets" class="anchor" aria-label="Permalink: Interactions between worklets" href="#interactions-between-worklets"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Communication between worklets is not possible in the initial design. However, adding support for this would enable multiple origins to flexibly share information without needing a dedicated origin for that sharing. Relatedly, allowing a worklet to create other worklets might be useful.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Registering event handlers</h3><a id="user-content-registering-event-handlers" class="anchor" aria-label="Permalink: Registering event handlers" href="#registering-event-handlers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">We could support event handlers in future iterations. For example, a handler could run a previously registered operation when a given key is modified (e.g. when an entry is updated via a set or append call):</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="sharedStorage.addEventListener( 'key' /* event_type */, 'operation-to-run' /* operation_name */, { key: 'example-key', actions: ['set', 'append'] } /* options */);"><pre><span class="pl-s1">sharedStorage</span><span class="pl-kos">.</span><span class="pl-en">addEventListener</span><span class="pl-kos">(</span> <span class="pl-s">'key'</span> <span class="pl-c">/* event_type */</span><span class="pl-kos">,</span> <span class="pl-s">'operation-to-run'</span> <span class="pl-c">/* operation_name */</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">key</span>: <span class="pl-s">'example-key'</span><span class="pl-kos">,</span> <span class="pl-c1">actions</span>: <span class="pl-kos">[</span><span class="pl-s">'set'</span><span class="pl-kos">,</span> <span class="pl-s">'append'</span><span class="pl-kos">]</span> <span class="pl-kos">}</span> <span class="pl-c">/* options */</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Acknowledgements</h2><a id="user-content-acknowledgements" class="anchor" aria-label="Permalink: Acknowledgements" href="#acknowledgements"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Many thanks for valuable feedback and advice from:</p> <p dir="auto">Victor Costan, Christian Dullweber, Charlie Harrison, Jeff Kaufman, Rowan Merewood, Marijn Kruisselbrink, Nasko Oskov, Evgeny Skvortsov, Michael Tomaine, David Turner, David Van Cleve, Zheng Wei, Mike West.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="iStl1Xe3VuHEIxLEeH+zLdJtLnsqw62+qNVtdXOCqtDDsLxSdGUkFaze7+yRaBiETWgnhwIayeRNDtGwRd1AjA==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm 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4.616 0 0 1 3.282 1.355c.41.408.757.86.996 1.428.238.568.348 1.206.347 1.968 0 2.193-1.505 4.254-3.081 5.862-1.496 1.526-3.213 2.796-4.249 3.563l-.22.163a.749.749 0 0 1-.895 0l-.221-.163c-1.036-.767-2.753-2.037-4.249-3.563C1.51 10.008.007 7.952.002 5.762a4.614 4.614 0 0 1 1.353-3.407C3.123.585 6.223.537 8.048 2.24Zm-1.153.983c-1.25-1.033-3.321-.967-4.48.191a3.115 3.115 0 0 0-.913 2.335c0 1.556 1.109 3.24 2.652 4.813C5.463 11.898 6.96 13.032 8 13.805c.353-.262.758-.565 1.191-.905l-1.326-1.223a.75.75 0 0 1 1.018-1.102l1.48 1.366c.328-.281.659-.577.984-.887L9.99 9.802a.75.75 0 1 1 1.019-1.103l1.384 1.28c.295-.329.566-.661.81-.995L12.92 8.7l-1.167-1.168c-.674-.671-1.78-.664-2.474.03-.268.269-.538.537-.802.797-.893.882-2.319.843-3.185-.032-.346-.35-.693-.697-1.043-1.047a.75.75 0 0 1-.04-1.016c.162-.191.336-.401.52-.623.62-.748 1.356-1.637 2.166-2.417Zm7.112 4.442c.313-.65.491-1.293.491-1.916v-.001c0-.614-.088-1.045-.23-1.385-.143-.339-.357-.633-.673-.949a3.111 3.111 0 0 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href="/WICG/shared-storage/custom-properties" data-view-component="true" class="Link Link--muted"> <svg text="gray" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-note mr-2"> <path d="M0 3.75C0 2.784.784 2 1.75 2h12.5c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 14H1.75A1.75 1.75 0 0 1 0 12.25Zm1.75-.25a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-8.5a.25.25 0 0 0-.25-.25ZM3.5 6.25a.75.75 0 0 1 .75-.75h7a.75.75 0 0 1 0 1.5h-7a.75.75 0 0 1-.75-.75Zm.75 2.25h4a.75.75 0 0 1 0 1.5h-4a.75.75 0 0 1 0-1.5Z"></path> </svg> <span class="color-fg-muted">Custom properties</span> </a> </div> <h3 class="sr-only">Stars</h3> <div class="mt-2"> <a href="/WICG/shared-storage/stargazers" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star mr-2"> <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <strong>95</strong> stars </a> </div> <h3 class="sr-only">Watchers</h3> <div class="mt-2"> <a href="/WICG/shared-storage/watchers" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-eye mr-2"> <path d="M8 2c1.981 0 3.671.992 4.933 2.078 1.27 1.091 2.187 2.345 2.637 3.023a1.62 1.62 0 0 1 0 1.798c-.45.678-1.367 1.932-2.637 3.023C11.67 13.008 9.981 14 8 14c-1.981 0-3.671-.992-4.933-2.078C1.797 10.83.88 9.576.43 8.898a1.62 1.62 0 0 1 0-1.798c.45-.677 1.367-1.931 2.637-3.022C4.33 2.992 6.019 2 8 2ZM1.679 7.932a.12.12 0 0 0 0 .136c.411.622 1.241 1.75 2.366 2.717C5.176 11.758 6.527 12.5 8 12.5c1.473 0 2.825-.742 3.955-1.715 1.124-.967 1.954-2.096 2.366-2.717a.12.12 0 0 0 0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>46</strong> watching </a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/WICG/shared-storage/forks" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>24</strong> forks </a> </div> <div class="mt-2"> <a class="Link--muted" href="/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2FWICG%2Fshared-storage&report=WICG+%28user%29"> Report repository </a> </div> </div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame"> <a href="/WICG/shared-storage/releases" data-view-component="true" class="Link--primary no-underline Link"> Releases </a></h2> <div class="text-small color-fg-muted">No releases published</div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/orgs/WICG/packages?repo_name=shared-storage" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center"> Packages <span title="0" hidden="hidden" data-view-component="true" class="Counter ml-1">0</span> </a></h2> <div class="text-small color-fg-muted" > No packages published <br> </div> </div> </div> <div class="BorderGrid-row" hidden> <div class="BorderGrid-cell"> <include-fragment src="/WICG/shared-storage/used_by_list" accept="text/fragment+html"> </include-fragment> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/WICG/shared-storage/graphs/contributors" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center"> Contributors <span title="18" data-view-component="true" class="Counter ml-1">18</span> </a></h2> <include-fragment src="/WICG/shared-storage/contributors_list?count=18&current_repository=shared-storage&items_to_show=14" aria-busy="true" aria-label="Loading contributors"> <ul class="list-style-none d-flex flex-wrap mb-n2"> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> </ul> </include-fragment> <div data-view-component="true" class="mt-3"> <a text="small" href="/WICG/shared-storage/graphs/contributors" data-view-component="true" class="Link--inTextBlock Link"> + 4 contributors </a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3">Languages</h2> <div class="mb-2"> <span data-view-component="true" class="Progress"> <span style="background-color:#5562ac !important;;width: 99.6%;" itemprop="keywords" aria-label="Bikeshed 99.6" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#427819 !important;;width: 0.4%;" itemprop="keywords" aria-label="Makefile 0.4" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> </span></div> <ul class="list-style-none"> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/WICG/shared-storage/search?l=bikeshed" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#5562ac;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Bikeshed</span> <span>99.6%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/WICG/shared-storage/search?l=makefile" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#427819;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Makefile</span> <span>0.4%</span> </a> </li> </ul> </div> </div> </div> </div> </div></div> </div> </div> </turbo-frame> </main> </div> </div> <footer class="footer pt-8 pb-6 f6 color-fg-muted p-responsive" role="contentinfo" > <h2 class='sr-only'>Footer</h2> <div class="d-flex flex-justify-center flex-items-center flex-column-reverse flex-lg-row flex-wrap flex-lg-nowrap"> <div class="d-flex flex-items-center flex-shrink-0 mx-2"> <a aria-label="Homepage" title="GitHub" 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