Progressive web apps

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href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#how_to">How to</a></li> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#tutorials">Tutorials</a></li> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#reference">Reference</a></li> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#see_also">See also</a></li> </ul> </section> </div> </div> <div class="sidebar-body"> <ol> <li class="section"><em><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB" aria-current="page">Progressive web apps</a></em></li> <li class="section"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Guides</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/What_is_a_progressive_web_app?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">What is a progressive web app?</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Installing?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Installing and uninstalling web apps</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Making_PWAs_installable?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Making PWAs installable</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Offline_and_background_operation?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Offline and background operation</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Caching?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Caching</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Best_practices?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Best practices for PWAs</a></li> <li class="section"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Tutorials</a></li> <li> <ol> <li> <details> <summary>CycleTracker</summary> <ol> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">CycleTracker</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/HTML_and_CSS?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Base HTML and CSS</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Secure_connection?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Secure connection</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/JavaScript_functionality?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">JavaScript functionality</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Manifest_file?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Manifest and iconography</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Service_workers?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Service workers</a></li> </ol> </details></li> </ol></li> <li> <ol> <li> <details> <summary>js13kGames</summary> <ol> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">js13kGames</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/App_structure?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Progressive web app structure</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Offline_Service_workers?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Making PWAs work offline with Service workers</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Installable_PWAs?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">How to make PWAs installable</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Re-engageable_Notifications_Push?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">How to make PWAs re-engageable using Notifications and Push</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Loading?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Progressive loading</a></li> </ol> </details></li> </ol></li> <li class="section"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">How to</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Trigger_install_prompt?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Trigger installation from your PWA</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Define_app_icons?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Define your app icons</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Create_a_standalone_app?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Create a standalone app</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Customize_your_app_colors?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Customize your app's theme and background colors</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Display_badge_on_app_icon?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Display a badge on the app icon</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Expose_common_actions_as_shortcuts?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Expose common app actions as shortcuts</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Share_data_between_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Share data between apps</a></li> <li><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Associate_files_with_your_PWA?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Associate files with your PWA</a></li> <li class="section"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Reference?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Reference</a></li> </ol> </div> </div> <section class="place side"></section> </nav> </aside> <div class="toc-container"> <aside class="toc"> <nav> <div class="document-toc-container"> <section class="document-toc"> <header> <h2 class="document-toc-heading">In this article</h2> </header> <ul class="document-toc-list"> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#guides">Guides</a></li> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#how_to">How to</a></li> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#tutorials">Tutorials</a></li> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#reference">Reference</a></li> <li class="document-toc-item "><a class="document-toc-link" href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#see_also">See also</a></li> </ul> </section> </div> </nav> </aside> <section class="place side"></section> </div> </div> <main id="content" class="main-content "> <article class="main-page-content" lang="en-US"> <header> <h1>Progressive web apps</h1> </header> <div class="section-content"> <p>A <strong>progressive web app</strong> (PWA) is an app that's built using web platform technologies, but that provides a user experience like that of a platform-specific app.</p> <p>Like a website, a PWA can run on multiple platforms and devices from a single codebase. Like a platform-specific app, it can be installed on the device, can operate while offline and in the background, and can integrate with the device and with other installed apps.</p> </div> <section aria-labelledby="guides"> <h2 id="guides"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#guides">Guides</a></h2> <div class="section-content"> <p>These guides give conceptual explanations of different aspects of PWAs. They're intended to help you understand what kinds of things are possible with PWAs, and to provide enough pointers to help you understand how to achieve them.</p> <dl> <dt id="what_is_a_progressive_web_app"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/What_is_a_progressive_web_app?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">What is a progressive web app?</a> </dt> <dd> <p>An introduction to PWAs, comparing them with traditional websites and with platform-specific apps, and outlining their main features.</p> </dd> <dt id="making_pwas_installable"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Making_PWAs_installable?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Making PWAs installable</a> </dt> <dd> <p>One of the defining aspects of a PWA is that it can be installed on the device, and then appears to users as a platform-specific app, a permanent feature of their device which they can launch directly from the operating system like any other app. In this guide we'll explore what "installable" means, what a PWA needs to provide for it to be installable, and how you can customize the install experience.</p> </dd> <dt id="installing_and_uninstalling_web_apps"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Installing?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Installing and uninstalling web apps</a> </dt> <dd> <p>This guide covers how users can install and uninstall PWAs on their devices.</p> </dd> <dt id="offline_and_background_operation"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Offline_and_background_operation?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Offline and background operation</a> </dt> <dd> <p>In this guide, we'll introduce a set of technologies that enable a PWA to provide a good user experience even when the device has intermittent network connectivity and to perform operations in the background, even when the main app is not running.</p> </dd> <dt id="caching"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Caching?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Caching</a> </dt> <dd> <p>An overview of the APIs that enable a PWA to cache resources locally, and some common strategies used by PWAs to implement offline functionality.</p> </dd> <dt id="best_practices_for_pwas"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Guides/Best_practices?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Best practices for PWAs</a> </dt> <dd> <p>PWAs should adapt to different browsers and devices, be accessible, have good performance, and integrate well with the operating system. This guide provides a list of best practices to help you make sure your PWA is as good as it can be.</p> </dd> </dl> </div> </section> <section aria-labelledby="how_to"> <h2 id="how_to"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#how_to">How to</a></h2> <div class="section-content"> <p>These guides give concrete detailed instructions for how to implement specific PWA features.</p> <dl> <dt id="create_a_standalone_app"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Create_a_standalone_app?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Create a standalone app</a> </dt> <dd> <p>Describes how to specify that a PWA should be launched in its own dedicated window when it is launched, rather than a browser tab.</p> </dd> <dt id="define_your_app_icons"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Define_app_icons?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Define your app icons</a> </dt> <dd> <p>Describes how to define your own set of icons to be used when the PWA is installed on a device.</p> </dd> <dt id="customize_your_apps_colors"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Customize_your_app_colors?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Customize your app's colors</a> </dt> <dd> <p>Describes how to set background and theme colors for a PWA.</p> </dd> <dt id="display_badges"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Display_badge_on_app_icon?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Display badges</a> </dt> <dd> <p>Describes how to display a badge on the PWA's icon: for example to let the user know that they have received new messages.</p> </dd> <dt id="expose_common_app_actions_as_shortcuts"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Expose_common_actions_as_shortcuts?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Expose common app actions as shortcuts</a> </dt> <dd> <p>Describes how to expose common actions for a PWA that can be launched from the operating system's app shortcut menu.</p> </dd> <dt id="share_data_between_apps"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Share_data_between_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Share data between apps</a> </dt> <dd> <p>Describes how PWAs can share data with each other by using the operating system's app sharing mechanism.</p> </dd> <dt id="trigger_installation_from_your_pwa"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Trigger_install_prompt?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Trigger installation from your PWA</a> </dt> <dd> <p>Describes how developers can provide their own UI to invite users to install their PWA.</p> </dd> <dt id="associate_files_with_your_pwa"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/How_to/Associate_files_with_your_PWA?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Associate files with your PWA</a> </dt> <dd> <p>Describes how you can create an association between file types and your PWA, so that when the user clicks on the file, your PWA is launched to handle it.</p> </dd> </dl> </div> </section> <section aria-labelledby="tutorials"> <h2 id="tutorials"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#tutorials">Tutorials</a></h2> <div class="section-content"> <p>In these tutorials, you'll build a PWA from scratch. Tutorials walk through the steps of creating an app, from start to finish, explaining how the different features of the app are implemented.</p> <dl> <dt id="creating_your_first_pwa"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Creating your first PWA</a> </dt> <dd> <p>This novice-level tutorial walks through the creation of a PWA to track menstrual cycles. Lessons include a walk through of the HTML, CSS, and JavaScript required to create a fully functional web app, setting up a testing environment, and complete explanations guiding the learner through upgrading the web app into a PWA; including developing and inspecting a manifest, adding a service worker, and using the service worker to delete stale caches.</p> </dd> <dt id="deep_dive_into_pwa"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Deep dive into PWA</a> </dt> <dd> <p>This intermediate-level tutorial walks through the creation of a PWA that lists information about games submitted to the A-Frame category in the <a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://2017.js13kgames.com/" class="external" target="_blank">js13kGames 2017</a> competition. This tutorial includes all the basics for creating a PWA, with additional features, including notifications, push, and app performance.</p> </dd> </dl> </div> </section> <section aria-labelledby="reference"> <h2 id="reference"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#reference">Reference</a></h2> <div class="section-content"> <p>Reference documentation for the web technologies you will use to build a PWA.</p> </div> </section> <section aria-labelledby="web_app_manifest"> <h3 id="web_app_manifest"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#web_app_manifest">Web app manifest</a></h3> <div class="section-content"> <dl> <dt id="web_app_manifest_members"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Manifest?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Web app manifest members</a> </dt> <dd> <p>Developers can use web app manifest members to describe a PWA, customize its appearance, and more deeply integrate it into the operating system.</p> </dd> </dl> </div> </section> <section aria-labelledby="service_worker_apis"> <h3 id="service_worker_apis"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#service_worker_apis">Service Worker APIs</a></h3> <div class="section-content"> <h4 id="communication_with_the_app">Communication with the app</h4> <p>The following APIs can be used by a service worker to communicate with its associated client PWA:</p> <dl> <dt id="client.postmessage"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Client/postMessage?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><code>Client.postMessage()</code></a> </dt> <dd> <p>Allows a service worker to send a message to its client PWA.</p> </dd> <dt id="broadcast_channel_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Broadcast_Channel_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Broadcast Channel API</a> </dt> <dd> <p>Allows a service worker and its client PWA to establish a basic two-way communication channel.</p> </dd> </dl> <h4 id="offline_operation">Offline operation</h4> <p>The following APIs can be used by a service worker to make your app work offline:</p> <dl> <dt id="cache"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Cache?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><code>Cache</code></a> </dt> <dd> <p>A persistent storage mechanism for HTTP responses used to store assets that can be reused when the app is offline.</p> </dd> <dt id="clients"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Clients?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><code>Clients</code></a> </dt> <dd> <p>An interface used to provide access to the documents that are controlled by the service worker.</p> </dd> <dt id="fetchevent"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/FetchEvent?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB"><code>FetchEvent</code></a> </dt> <dd> <p>An event, dispatched in the service worker with every HTTP request made by the client PWA. The event can be used to either send the request to the server as normal and save the response for future use, or intercept the request and immediately respond with a response cached previously.</p> </dd> </dl> <h4 id="background_operation">Background operation</h4> <p>The following APIs can be used by a service worker to perform tasks in the background, even when your app is not running:</p> <dl> <dt id="background_synchronization_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Background_Synchronization_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Background Synchronization API</a> </dt> <dd> <p>A way to defer tasks to run in a service worker once there is a stable network connection.</p> </dd> <dt id="web_periodic_background_synchronization_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Web_Periodic_Background_Synchronization_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Web Periodic Background Synchronization API</a> </dt> <dd> <p>A way to register tasks to be run in a service worker at periodic intervals with network connectivity.</p> </dd> <dt id="background_fetch_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Background_Fetch_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Background Fetch API</a> </dt> <dd> <p>A method for a service worker to manage downloads that may take a significant amount of time, such as video or audio files.</p> </dd> </dl> </div> </section> <section aria-labelledby="other_web_apis"> <h3 id="other_web_apis"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#other_web_apis">Other web APIs</a></h3> <div class="section-content"> <dl> <dt id="indexeddb"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/IndexedDB_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">IndexedDB</a> </dt> <dd> <p>A client-side storage API for significant amounts of structured data, including files.</p> </dd> <dt id="badging_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Badging_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Badging API</a> </dt> <dd> <p>A method of setting a badge on the application icon, providing a low-distraction notification.</p> </dd> <dt id="notifications_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Notifications_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Notifications API</a> </dt> <dd> <p>A way to send notifications that are displayed at the operating system level.</p> </dd> <dt id="web_share_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Web_Share_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Web Share API</a> </dt> <dd> <p>A mechanism for sharing text, links, files, and other content to other apps selected by the user on their device.</p> </dd> <dt id="window_controls_overlay_api"> <a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/API/Window_Controls_Overlay_API?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">Window Controls Overlay API</a> </dt> <dd> <p>An API for PWAs installed on desktop operating systems that enables hiding the default window title bar, enabling displaying the app over the full surface area of the app window.</p> </dd> </dl> </div> </section> <section aria-labelledby="see_also"> <h2 id="see_also"><a href="https://developer-mozilla-org.translate.goog/en-US/docs/Web/Progressive_web_apps?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB#see_also">See also</a></h2> <div class="section-content"> <ul> <li><a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://web.dev/explore/progressive-web-apps" class="external" target="_blank">Progressive web apps</a> on web.dev</li> <li><a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://web.dev/learn/pwa/" class="external" target="_blank">Learn PWA</a> on web.dev</li> <li><a href="https://translate.google.com/website?sl=pl&tl=iw&hl=en-GB&u=https://learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/" class="external" target="_blank">Progressive web apps</a> on learn.microsoft.com (2023)</li> </ul> </div> </section> </article> <aside class="article-footer"> <div class="article-footer-inner"> <div class="svg-container"> <svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewbox="0 0 162 162" fill="none" role="none"> <mask id="b" fill="#fff"> <path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 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Content available under <a href="https://developer-mozilla-org.translate.goog/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license?_x_tr_sl=pl&_x_tr_tl=iw&_x_tr_hl=en-GB">a Creative Commons license</a>.</p> </div> </div> </footer> </div> <script type="application/json" id="hydration">{"url":"/en-US/docs/Web/Progressive_web_apps","doc":{"isMarkdown":true,"isTranslated":false,"isActive":true,"flaws":{},"title":"Progressive web apps","mdn_url":"/en-US/docs/Web/Progressive_web_apps","locale":"en-US","native":"English (US)","sidebarHTML":"<ol><li class=\"section\"><em><a href=\"/en-US/docs/Web/Progressive_web_apps\" aria-current=\"page\">Progressive web apps</a></em></li><li class=\"section\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides\">Guides</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/What_is_a_progressive_web_app\">What is a progressive web app?</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Installing\">Installing and uninstalling web apps</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Making_PWAs_installable\">Making PWAs installable</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Offline_and_background_operation\">Offline and background operation</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Caching\">Caching</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Best_practices\">Best practices for PWAs</a></li><li class=\"section\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials\">Tutorials</a></li><li><ol><li><details><summary>CycleTracker</summary><ol><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker\">CycleTracker</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/HTML_and_CSS\">Base HTML and CSS</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Secure_connection\">Secure connection</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/JavaScript_functionality\">JavaScript functionality</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Manifest_file\">Manifest and iconography</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Service_workers\">Service workers</a></li></ol></details></li></ol></li><li><ol><li><details><summary>js13kGames</summary><ol><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames\">js13kGames</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/App_structure\">Progressive web app structure</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Offline_Service_workers\">Making PWAs work offline with Service workers</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Installable_PWAs\">How to make PWAs installable</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Re-engageable_Notifications_Push\">How to make PWAs re-engageable using Notifications and Push</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames/Loading\">Progressive loading</a></li></ol></details></li></ol></li><li class=\"section\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to\">How to</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Trigger_install_prompt\">Trigger installation from your PWA</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Define_app_icons\">Define your app icons</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Create_a_standalone_app\">Create a standalone app</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Customize_your_app_colors\">Customize your app's theme and background colors</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Display_badge_on_app_icon\">Display a badge on the app icon</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Expose_common_actions_as_shortcuts\">Expose common app actions as shortcuts</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Share_data_between_apps\">Share data between apps</a></li><li><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Associate_files_with_your_PWA\">Associate files with your PWA</a></li><li class=\"section\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Reference\">Reference</a></li></ol>","sidebarMacro":"PWASidebar","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>A <strong>progressive web app</strong> (PWA) is an app that's built using web platform technologies, but that provides a user experience like that of a platform-specific app.</p>\n<p>Like a website, a PWA can run on multiple platforms and devices from a single codebase. Like a platform-specific app, it can be installed on the device, can operate while offline and in the background, and can integrate with the device and with other installed apps.</p>"}},{"type":"prose","value":{"id":"guides","title":"Guides","isH3":false,"content":"<p>These guides give conceptual explanations of different aspects of PWAs. They're intended to help you understand what kinds of things are possible with PWAs, and to provide enough pointers to help you understand how to achieve them.</p>\n<dl>\n <dt id=\"what_is_a_progressive_web_app\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/What_is_a_progressive_web_app\">What is a progressive web app?</a></dt>\n <dd>\n <p>An introduction to PWAs, comparing them with traditional websites and with platform-specific apps, and outlining their main features.</p>\n </dd>\n <dt id=\"making_pwas_installable\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Making_PWAs_installable\">Making PWAs installable</a></dt>\n <dd>\n <p>One of the defining aspects of a PWA is that it can be installed on the device, and then appears to users as a platform-specific app, a permanent feature of their device which they can launch directly from the operating system like any other app. In this guide we'll explore what \"installable\" means, what a PWA needs to provide for it to be installable, and how you can customize the install experience.</p>\n </dd>\n <dt id=\"installing_and_uninstalling_web_apps\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Installing\">Installing and uninstalling web apps</a></dt>\n <dd>\n <p>This guide covers how users can install and uninstall PWAs on their devices.</p>\n </dd>\n <dt id=\"offline_and_background_operation\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Offline_and_background_operation\">Offline and background operation</a></dt>\n <dd>\n <p>In this guide, we'll introduce a set of technologies that enable a PWA to provide a good user experience even when the device has intermittent network connectivity and to perform operations in the background, even when the main app is not running.</p>\n </dd>\n <dt id=\"caching\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Caching\">Caching</a></dt>\n <dd>\n <p>An overview of the APIs that enable a PWA to cache resources locally, and some common strategies used by PWAs to implement offline functionality.</p>\n </dd>\n <dt id=\"best_practices_for_pwas\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Guides/Best_practices\">Best practices for PWAs</a></dt>\n <dd>\n <p>PWAs should adapt to different browsers and devices, be accessible, have good performance, and integrate well with the operating system. This guide provides a list of best practices to help you make sure your PWA is as good as it can be.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"how_to","title":"How to","isH3":false,"content":"<p>These guides give concrete detailed instructions for how to implement specific PWA features.</p>\n<dl>\n <dt id=\"create_a_standalone_app\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Create_a_standalone_app\">Create a standalone app</a></dt>\n <dd>\n <p>Describes how to specify that a PWA should be launched in its own dedicated window when it is launched, rather than a browser tab.</p>\n </dd>\n <dt id=\"define_your_app_icons\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Define_app_icons\">Define your app icons</a></dt>\n <dd>\n <p>Describes how to define your own set of icons to be used when the PWA is installed on a device.</p>\n </dd>\n <dt id=\"customize_your_apps_colors\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Customize_your_app_colors\">Customize your app's colors</a></dt>\n <dd>\n <p>Describes how to set background and theme colors for a PWA.</p>\n </dd>\n <dt id=\"display_badges\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Display_badge_on_app_icon\">Display badges</a></dt>\n <dd>\n <p>Describes how to display a badge on the PWA's icon: for example to let the user know that they have received new messages.</p>\n </dd>\n <dt id=\"expose_common_app_actions_as_shortcuts\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Expose_common_actions_as_shortcuts\">Expose common app actions as shortcuts</a></dt>\n <dd>\n <p>Describes how to expose common actions for a PWA that can be launched from the operating system's app shortcut menu.</p>\n </dd>\n <dt id=\"share_data_between_apps\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Share_data_between_apps\">Share data between apps</a></dt>\n <dd>\n <p>Describes how PWAs can share data with each other by using the operating system's app sharing mechanism.</p>\n </dd>\n <dt id=\"trigger_installation_from_your_pwa\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Trigger_install_prompt\">Trigger installation from your PWA</a></dt>\n <dd>\n <p>Describes how developers can provide their own UI to invite users to install their PWA.</p>\n </dd>\n <dt id=\"associate_files_with_your_pwa\"><a href=\"/en-US/docs/Web/Progressive_web_apps/How_to/Associate_files_with_your_PWA\">Associate files with your PWA</a></dt>\n <dd>\n <p>Describes how you can create an association between file types and your PWA, so that when the user clicks on the file, your PWA is launched to handle it.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"tutorials","title":"Tutorials","isH3":false,"content":"<p>In these tutorials, you'll build a PWA from scratch. Tutorials walk through the steps of creating an app, from start to finish, explaining how the different features of the app are implemented.</p>\n<dl>\n <dt id=\"creating_your_first_pwa\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker\">Creating your first PWA</a></dt>\n <dd>\n <p>This novice-level tutorial walks through the creation of a PWA to track menstrual cycles. Lessons include a walk through of the HTML, CSS, and JavaScript required to create a fully functional web app, setting up a testing environment, and complete explanations guiding the learner through upgrading the web app into a PWA; including developing and inspecting a manifest, adding a service worker, and using the service worker to delete stale caches.</p>\n </dd>\n <dt id=\"deep_dive_into_pwa\"><a href=\"/en-US/docs/Web/Progressive_web_apps/Tutorials/js13kGames\">Deep dive into PWA</a></dt>\n <dd>\n <p>This intermediate-level tutorial walks through the creation of a PWA that lists information about games submitted to the A-Frame category in the <a href=\"https://2017.js13kgames.com/\" class=\"external\" target=\"_blank\">js13kGames 2017</a> competition. This tutorial includes all the basics for creating a PWA, with additional features, including notifications, push, and app performance.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"reference","title":"Reference","isH3":false,"content":"<p>Reference documentation for the web technologies you will use to build a PWA.</p>"}},{"type":"prose","value":{"id":"web_app_manifest","title":"Web app manifest","isH3":true,"content":"<dl>\n <dt id=\"web_app_manifest_members\"><a href=\"/en-US/docs/Web/Manifest\">Web app manifest members</a></dt>\n <dd>\n <p>Developers can use web app manifest members to describe a PWA, customize its appearance, and more deeply integrate it into the operating system.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"service_worker_apis","title":"Service Worker APIs","isH3":true,"content":"<h4 id=\"communication_with_the_app\">Communication with the app</h4>\n<p>The following APIs can be used by a service worker to communicate with its associated client PWA:</p>\n<dl>\n <dt id=\"client.postmessage\"><a href=\"/en-US/docs/Web/API/Client/postMessage\"><code>Client.postMessage()</code></a></dt>\n <dd>\n <p>Allows a service worker to send a message to its client PWA.</p>\n </dd>\n <dt id=\"broadcast_channel_api\"><a href=\"/en-US/docs/Web/API/Broadcast_Channel_API\">Broadcast Channel API</a></dt>\n <dd>\n <p>Allows a service worker and its client PWA to establish a basic two-way communication channel.</p>\n </dd>\n</dl>\n<h4 id=\"offline_operation\">Offline operation</h4>\n<p>The following APIs can be used by a service worker to make your app work offline:</p>\n<dl>\n <dt id=\"cache\"><a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a></dt>\n <dd>\n <p>A persistent storage mechanism for HTTP responses used to store assets that can be reused when the app is offline.</p>\n </dd>\n <dt id=\"clients\"><a href=\"/en-US/docs/Web/API/Clients\"><code>Clients</code></a></dt>\n <dd>\n <p>An interface used to provide access to the documents that are controlled by the service worker.</p>\n </dd>\n <dt id=\"fetchevent\"><a href=\"/en-US/docs/Web/API/FetchEvent\"><code>FetchEvent</code></a></dt>\n <dd>\n <p>An event, dispatched in the service worker with every HTTP request made by the client PWA. The event can be used to either send the request to the server as normal and save the response for future use, or intercept the request and immediately respond with a response cached previously.</p>\n </dd>\n</dl>\n<h4 id=\"background_operation\">Background operation</h4>\n<p>The following APIs can be used by a service worker to perform tasks in the background, even when your app is not running:</p>\n<dl>\n <dt id=\"background_synchronization_api\"><a href=\"/en-US/docs/Web/API/Background_Synchronization_API\">Background Synchronization API</a></dt>\n <dd>\n <p>A way to defer tasks to run in a service worker once there is a stable network connection.</p>\n </dd>\n <dt id=\"web_periodic_background_synchronization_api\"><a href=\"/en-US/docs/Web/API/Web_Periodic_Background_Synchronization_API\">Web Periodic Background Synchronization API</a></dt>\n <dd>\n <p>A way to register tasks to be run in a service worker at periodic intervals with network connectivity.</p>\n </dd>\n <dt id=\"background_fetch_api\"><a href=\"/en-US/docs/Web/API/Background_Fetch_API\">Background Fetch API</a></dt>\n <dd>\n <p>A method for a service worker to manage downloads that may take a significant amount of time, such as video or audio files.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"other_web_apis","title":"Other web APIs","isH3":true,"content":"<dl>\n <dt id=\"indexeddb\"><a href=\"/en-US/docs/Web/API/IndexedDB_API\">IndexedDB</a></dt>\n <dd>\n <p>A client-side storage API for significant amounts of structured data, including files.</p>\n </dd>\n <dt id=\"badging_api\"><a href=\"/en-US/docs/Web/API/Badging_API\">Badging API</a></dt>\n <dd>\n <p>A method of setting a badge on the application icon, providing a low-distraction notification.</p>\n </dd>\n <dt id=\"notifications_api\"><a href=\"/en-US/docs/Web/API/Notifications_API\">Notifications API</a></dt>\n <dd>\n <p>A way to send notifications that are displayed at the operating system level.</p>\n </dd>\n <dt id=\"web_share_api\"><a href=\"/en-US/docs/Web/API/Web_Share_API\">Web Share API</a></dt>\n <dd>\n <p>A mechanism for sharing text, links, files, and other content to other apps selected by the user on their device.</p>\n </dd>\n <dt id=\"window_controls_overlay_api\"><a href=\"/en-US/docs/Web/API/Window_Controls_Overlay_API\">Window Controls Overlay API</a></dt>\n <dd>\n <p>An API for PWAs installed on desktop operating systems that enables hiding the default window title bar, enabling displaying the app over the full surface area of the app window.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"see_also","title":"See also","isH3":false,"content":"<ul>\n <li><a href=\"https://web.dev/explore/progressive-web-apps\" class=\"external\" target=\"_blank\">Progressive web apps</a> on web.dev</li>\n <li><a href=\"https://web.dev/learn/pwa/\" class=\"external\" target=\"_blank\">Learn PWA</a> on web.dev</li>\n <li><a href=\"https://learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/\" class=\"external\" target=\"_blank\">Progressive web apps</a> on learn.microsoft.com (2023)</li>\n</ul>"}}],"toc":[{"text":"Guides","id":"guides"},{"text":"How to","id":"how_to"},{"text":"Tutorials","id":"tutorials"},{"text":"Reference","id":"reference"},{"text":"See also","id":"see_also"}],"summary":"A progressive web app (PWA) is an app that's built using web platform technologies, but that provides a user experience like that of a platform-specific app.","popularity":0.0798,"modified":"2023-10-25T17:27:32.000Z","other_translations":[{"locale":"de","title":"Progressive web apps","native":"Deutsch"},{"locale":"es","title":"Aplicaciones Web Progresivas","native":"Español"},{"locale":"fr","title":"Applications web progressives","native":"Français"},{"locale":"ja","title":"プログレッシブウェブアプリ (PWA)","native":"日本語"},{"locale":"ko","title":"프로그레시브 웹 앱","native":"한국어"},{"locale":"pt-BR","title":"Progressive Web Apps","native":"Português (do Brasil)"},{"locale":"ru","title":"Прогрессивные веб-приложения","native":"Русский"},{"locale":"zh-CN","title":"渐进式 Web 应用（PWA）","native":"中文 (简体)"},{"locale":"zh-TW","title":"漸進式網路應用程式","native":"正體中文 (繁體)"}],"pageType":"landing-page","source":{"folder":"en-us/web/progressive_web_apps","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/progressive_web_apps/index.md","last_commit_url":"https://github.com/mdn/content/commit/835d6632d59993861a0458510402787f8a2c3cb3","filename":"index.md"},"short_title":"Progressive web apps","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/Progressive_web_apps","title":"Progressive web apps"}],"pageTitle":"Progressive web apps | MDN","noIndexing":false}}</script> <script>function gtElInit() {var lib = new google.translate.TranslateService();lib.translatePage('pl', 'iw', function () {});}</script> <script src="https://translate.google.com/translate_a/element.js?cb=gtElInit&hl=en-GB&client=wt" type="text/javascript"></script> </body> </html>

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