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should it be possible for an element with contain:paint to be part of a transform-style:preserve-3d scene? · Issue #6202 · w3c/csswg-drafts · GitHub
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class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Resources <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul class="list-style-none f5" 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class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" 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version="1.1" width="24" data-view-component="true" class="octicon octicon-stack color-fg-subtle mr-3"> <path d="M11.063 1.456a1.749 1.749 0 0 1 1.874 0l8.383 5.316a1.751 1.751 0 0 1 0 2.956l-8.383 5.316a1.749 1.749 0 0 1-1.874 0L2.68 9.728a1.751 1.751 0 0 1 0-2.956Zm1.071 1.267a.25.25 0 0 0-.268 0L3.483 8.039a.25.25 0 0 0 0 .422l8.383 5.316a.25.25 0 0 0 .268 0l8.383-5.316a.25.25 0 0 0 0-.422Z"></path><path d="M1.867 12.324a.75.75 0 0 1 1.035-.232l8.964 5.685a.25.25 0 0 0 .268 0l8.964-5.685a.75.75 0 0 1 .804 1.267l-8.965 5.685a1.749 1.749 0 0 1-1.874 0l-8.965-5.685a.75.75 0 0 1-.231-1.035Z"></path><path d="M1.867 16.324a.75.75 0 0 1 1.035-.232l8.964 5.685a.25.25 0 0 0 .268 0l8.964-5.685a.75.75 0 0 1 .804 1.267l-8.965 5.685a1.749 1.749 0 0 1-1.874 0l-8.965-5.685a.75.75 0 0 1-.231-1.035Z"></path> </svg> <div> <div class="color-fg-default h4">Enterprise platform</div> AI-powered developer platform </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-bottom-0"> <span 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--></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="/g+7Dh/D3kK8RGsqZ//aArTWXeCa2ThKG+vh/mZn//ZTkdO/v7PwT9xkmKs0qk8xWKy+PGOTThHlLG/rz9BaJA==" /> <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"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button 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color-fg-muted">#6202</span> </h1> </div> </div> <div class="d-flex flex-items-center flex-wrap mt-0 gh-header-meta"> <div class="flex-shrink-0 mb-2 flex-self-start flex-md-self-center"> <span title="Status: Closed" data-view-component="true" class="State State--merged d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-issue-closed flex-items-center mr-1"> <path d="M11.28 6.78a.75.75 0 0 0-1.06-1.06L7.25 8.69 5.78 7.22a.75.75 0 0 0-1.06 1.06l2 2a.75.75 0 0 0 1.06 0l3.5-3.5Z"></path><path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0Zm-1.5 0a6.5 6.5 0 1 0-13 0 6.5 6.5 0 0 0 13 0Z"></path> </svg> Closed </span> </div> <div class="mb-2 flex-shrink-0"> <div> </div> </div> <div class="flex-shrink-0 mb-2 flex-self-start flex-md-self-center"> </div> <div class="flex-auto min-width-0 mb-2"> <a class="author text-bold Link--secondary" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron">dbaron</a> opened this issue <relative-time datetime="2021-04-09T22:30:25Z" class="no-wrap">Apr 9, 2021</relative-time> · 9 comments <span data-issue-and-pr-hovercards-enabled> </span> </div> </div> <div class="js-sticky js-sticky-offset-scroll top-0 gh-header-sticky"> <div class="sticky-content"> <div class="d-flex flex-items-center flex-justify-between mt-2"> <div class="d-flex flex-row flex-items-center min-width-0"> <div class="mr-2 mb-2 flex-shrink-0"> <span title="Status: Closed" data-view-component="true" class="State State--merged d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-issue-closed flex-items-center mr-1"> <path d="M11.28 6.78a.75.75 0 0 0-1.06-1.06L7.25 8.69 5.78 7.22a.75.75 0 0 0-1.06 1.06l2 2a.75.75 0 0 0 1.06 0l3.5-3.5Z"></path><path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0Zm-1.5 0a6.5 6.5 0 1 0-13 0 6.5 6.5 0 0 0 13 0Z"></path> </svg> Closed </span> </div> <div class="mb-2 flex-shrink-0"> <div> </div> </div> <div class="mb-2 flex-shrink-0"> </div> <div class="min-width-0 mr-2 mb-2"> <h1 class="d-flex text-bold f5"> <a class="js-issue-title css-truncate css-truncate-target Link--primary width-fit markdown-title js-smoothscroll-anchor" href="#top"> should it be possible for an element with contain:paint to be part of a transform-style:preserve-3d scene? </a> <span class="gh-header-number color-fg-muted pl-1">#6202</span> </h1> <div class="meta color-fg-muted css-truncate css-truncate-target d-block width-fit"> <a class="author text-bold Link--secondary" data-hovercard-z-index-override="111" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron">dbaron</a> opened this issue <relative-time datetime="2021-04-09T22:30:25Z" class="no-wrap">Apr 9, 2021</relative-time> · 9 comments <span data-issue-and-pr-hovercards-enabled> </span> </div> </div> </div> </div> </div> </div> <div class="gh-header-shadow color-shadow-small js-notification-shelf-offset-top"></div> </div> <div class="d-block d-md-none border-bottom mb-4 f6"> <div class="d-flex mb-3"> <span class="text-bold color-fg-muted col-3 col-sm-2 flex-shrink-0">Labels</span> <div class="min-width-0 d-flex flex-wrap mt-n1"> <a id="label-a5b9f9" href="/w3c/csswg-drafts/labels/Closed%20Accepted%20by%20CSSWG%20Resolution" data-name="Closed Accepted by CSSWG Resolution" style="--label-r:14;--label-g:138;--label-b:22;--label-h:123;--label-s:81;--label-l:29;" data-view-component="true" class="IssueLabel hx_IssueLabel width-fit mb-1 mr-1"> <span class="css-truncate css-truncate-target width-fit">Closed Accepted by CSSWG Resolution</span> </a> <a id="label-8521f0" href="/w3c/csswg-drafts/labels/Commenter%20Satisfied" 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data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/248721?s=80&v=4" width="40" height="40" alt="@dbaron" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issue-854892896"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="e583b856ba3ba66b56257083d4741f92c8ad9f43acb4f7dfc2e4cf489361ee22"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issue-854892896-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user is a member of the w3c organization." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Member</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron">dbaron</a> </strong> commented <a href="#issue-854892896" id="issue-854892896-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-04-09T22:30:25Z" class="no-wrap">Apr 9, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Right now the specs <a href="https://drafts.csswg.org/css-contain-1/#containment-paint" rel="nofollow">for <code class="notranslate">contain:paint</code></a> and <a href="https://drafts.csswg.org/css-transforms-2/#transform-style-property" rel="nofollow">for <code class="notranslate">transform-style</code></a> allow an element with <code class="notranslate">contain: paint</code> to be part of a 3D scene. If such an element both has <code class="notranslate">transform-style: preserve-3d</code> <em>and</em> has a parent that does, then this means that its children (or further descendants, if the children have <code class="notranslate">transform-style: preserve-3d</code>) are rendered as part of its parent's (or further ancestor's, if the ancestor chain has <code class="notranslate">transform-style: preserve-3d</code> further up) 3D scene.</p> <p dir="auto">While the intended guarantees of <code class="notranslate">contain: paint</code> aren't clearly defined, it seems a bit nonintuitive to me that it would allow children to escape the container in this way.</p> <p dir="auto">What is the desired behavior here?</p> </td> </tr> <tr class="d-block pl-3 pr-3 pb-3 js-comment-body-error" hidden> <td class="d-block"> <div class="flash flash-warn" role="alert"> <p class="mb-1"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-info"> <path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path> </svg> The text was updated successfully, but these errors were encountered: </p> <ol class="mb-0 pl-4 ml-4"> </ol> </div> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/w3c/csswg-drafts/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" 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<details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-851289215-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has been invited to collaborate on the csswg-drafts repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Collaborator</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/frivoal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/frivoal">frivoal</a> </strong> commented <a href="#issuecomment-851289215" id="issuecomment-851289215-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-05-31T07:58:04Z" class="no-wrap">May 31, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">I'm not sure. Given that paint-contained element cannot have visible overflow, is there really an issue?<br> If I understand correctly, their content would get positioned into the ancestor's 3D scene, but whether they get painted or not is still depends on whether they overflow the bounds of the containing element, as it would with any other ancestor with overflow:clip. (in the case of non-clip, non-visible overflow, the problem doesn't arise, as the other values cause flattening).</p> <p dir="auto">If this is a misunderstanding, and elements that are part of a 3D scene do not get clipped at the boundaries of an overflow:clip element, then I suspect the correct answer is to add <code class="notranslate">contain: paint</code> to the list of property/value pairs that force the element to have a used style of flat for preserve-3d in <a href="https://drafts.csswg.org/css-transforms-2/#grouping-property-values" rel="nofollow">https://drafts.csswg.org/css-transforms-2/#grouping-property-values</a></p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" 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role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the csswg-drafts repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/chrishtr/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/chrishtr">chrishtr</a> </strong> commented <a href="#issuecomment-853273503" id="issuecomment-853273503-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-06-02T18:12:19Z" class="no-wrap">Jun 2, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Contain:paint's clip is the same as an overflow:clip. I don't remember why that restriction is there in the transforms spec, can we just make overflow:clip a grouping property?</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/w3c/csswg-drafts/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="_-bYX1Q8tCjsOaDwQ5m_VvcXOouEjPgGOcmoHgTH_rEB9XQwJQWFxyH9LriZw1ZRhd4rnWfN1poSALDPmqmIEg" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDg1MzI3MzUwMw=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex 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viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-857835865-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user is a member of the w3c organization." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Member</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/tabatkins/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/tabatkins">tabatkins</a> </strong> commented <a href="#issuecomment-857835865" id="issuecomment-857835865-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-06-09T16:08:28Z" class="no-wrap">Jun 9, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">I agree that <code class="notranslate">contain:paint</code> should be a grouping property, yes.</p> <p dir="auto">And I think it makes sense for <code class="notranslate">overflow:clip</code> to be one too; it's not clear to me why it would make sense, or what it would mean, for a clipped-overflow element's descendants to be able to escape it in 3d.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/w3c/csswg-drafts/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="I6l6VpbUSBeSxM70fx5S9LVOS2tCERy-wMHjbI7iPLjdutY55-15-F8AQLylRLvzx4dafaFQMiLrCPu9EIxKGw" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDg1NzgzNTg2NQ=="> <input type="hidden" 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class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">The CSS Working Group just discussed <code class="notranslate">should it be possible for an element with contain:paint to be part of a transform-style:preserve-3d scene?</code>, and agreed to the following:</p> <ul dir="auto"> <li><code class="notranslate">RESOLVED: add contain:paint to list of grouping properties</code></li> </ul> <details><summary>The full IRC log of that discussion</summary> <dael> Topic: should it be possible for an element with contain:paint to be part of a transform-style:preserve-3d scene?<br> <dael> github: https://github.com/<a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="854892896" data-permission-text="Title is private" data-url="https://github.com/w3c/csswg-drafts/issues/6202" data-hovercard-type="issue" data-hovercard-url="/w3c/csswg-drafts/issues/6202/hovercard" href="https://github.com/w3c/csswg-drafts/issues/6202">/issues/6202</a><br> <dael> TabAtkins: The summary is when you have a preserve3d transform nothing prevents a contain:paint participate in the 3d scene.<br> <dael> TabAtkins: A bunch of properties restricted to force it to become flat so children are container<br> <dael> TabAtkins: contain:paint should work the same<br> <smfr> overflow does NOT create a graphical group<br> <dael> TabAtkins: Spec also allows overflow-clip to have children leave element entirely and florian pointed out that doesn't make sense.<br> <smfr> q+<br> <dael> TabAtkins: If we're having overflow:contain-paint to cause flattening we should have them both<br> <dael> TabAtkins: Prop: add contain-paint to list of grouping properties that force it to be flat. Remove clip value form exceptions so it also causes it to be flat<br> <dael> smfr: I think this is right thing. I think contain-paint causes stacking but should flatten<br> <dael> smfr: I think TabAtkins said non-visbile overflow creates stacking?<br> <Rossen_> ack smfr<br> <dael> TabAtkins: Overflow-clip is on list of values that don't cause flattening. Feels weird. I think it should<br> <chrishtr> agree that clip and contain:paint should cause flattenign<br> <dael> smfr: That's fine. I agree with proposal<br> <TabAtkins> s/overflow-clip/overflow:clip/<br> <dael> dbaron[m]: I agree as well<br> <dael> Rossen_: Other feedback or objections?<br> <dael> smfr: Prop to make coverflow:clip a grouping property. Impl it creates stacking context?<br> <dael> florian: DOn't think so<br> <dael> smfr: Think it does<br> <dael> dbaron[m]: We do have that grouping prop create stacking context. That said, I wrote a test a few weeks ago to see what rbowsers made group. Tested with transform flattening and mixed blend and got entirely different results in all browsers.<br> <dael> dbaron[m]: Given that I think we don't have a good sense of grouping<br> <dael> smfr: Testing with opacity or filters might have given more consistent<br> <dael> smfr: I don't want to separate grouping from stacking context. Would create complexity<br> <dael> florian: I don't think the grouping are defined to create stacking<br> <dael> dbaron[m]: Don't have a spec for this. I did have understanding that the set of things grouping is subset of things that create stacking<br> <dael> TabAtkins: Happy to remove overflow:clip part and just do contain-paint<br> <dbaron[m]> the test I'm talking about was https://dbaron.org/css/test/2018/stacking-context-z-order<br> <dael> smfr: contain-paint can imply overflow:clip. Would love overflow properties that create stacking, but that ship has sailed<br> <dael> Rossen_: TabAtkins just resolve on contain:paint and leave overflow:clip for now?<br> <dael> TabAtkins: Yes<br> <dael> Rossen_: That's the proposal. thoughts or objections?<br> <dael> florian: Thought; maybe misunderstanding. Seems it's not necessary for overflow:clip to flatten a 3d transform b/c can position in 3d model. If when it's time to paint the projection is outside area you paint you clip<br> <dael> smfr: Please don't make clipping a thing we nee din 3d scenes<br> <smfr> q+<br> <dael> Rossen_: Great convo that should happen when additional investigation of overflow:clip takes place<br> <dael> smfr: If we resolve on this do we need to resolve on if will-change contains side effects. From dbaron[m] chart it does nto have stacking.<br> <dael> TabAtkins: Can you open as separate issue?<br> <dael> smfr: Yes<br> <dael> Rossen_: not hearing objection sot contain:paint<br> <dbaron[m]> I think will-change's definition is pretty clear about what's �supposed� to happen...<br> <dael> RESOLVED: add contain:paint to list of grouping properties<br> <dael> Rossen_: Anything else on this?<br> </details> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/w3c/csswg-drafts/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" 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href="/mozilla-apprentice">mozilla-apprentice</a> mentioned this issue <a class="Link--secondary" href="#ref-issue-916411808" > <relative-time datetime="2021-06-09T16:49:11Z" class="no-wrap">Jun 9, 2021</relative-time> </a> </div> <div class="mt-2 d-flex flex-items-start flex-column flex-md-row"> <div class="flex-auto wb-break-word" id="ref-issue-916411808" > <a href="/mozilla/wg-decisions/issues/560" class="Link--primary f4 text-bold markdown-title" data-hovercard-type="issue" data-hovercard-url="/mozilla/wg-decisions/issues/560/hovercard"> should it be possible for an element with contain:paint to be part of a transform-style:preserve-3d scene? <span class="color-fg-muted text-normal" >mozilla/wg-decisions#560</span> </a> </div> <div class="flex-shrink-0 my-1 my-md-0 ml-md-3"> <span title="Status: Closed" data-view-component="true" class="State State--merged State--small d-flex flex-items-center"> <svg aria-hidden="true" height="12" viewBox="0 0 16 16" version="1.1" width="12" 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0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="MDEyOklzc3VlQ29tbWVudDg1ODE1ODQ5MQ=="> <div class="TimelineItem js-comment-container" data-gid="MDEyOklzc3VlQ29tbWVudDg1ODE1ODQ5MQ==" data-url="/w3c/csswg-drafts/comments/MDEyOklzc3VlQ29tbWVudDg1ODE1ODQ5MQ==/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/248721?s=80&v=4" width="40" height="40" alt="@dbaron" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " 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</span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-858158491-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user is a member of the w3c organization." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Member</span> </span> <span aria-label="This user is the author of this issue." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron">dbaron</a> </strong> commented <a href="#issuecomment-858158491" id="issuecomment-858158491-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-06-09T23:08:11Z" class="no-wrap">Jun 9, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">To follow up on this mornings discussion -- I noticed that the compositing spec <a href="https://drafts.fxtf.org/compositing-1/#csscompositingrules_CSS" rel="nofollow">says</a> (for HTML but not SVG):</p> <blockquote> <p dir="auto">Everything in CSS that creates a stacking context must be considered an ‘isolated’ group.</p> </blockquote> <p dir="auto">This makes the results I'm seeing in <a href="https://dbaron.org/css/test/2018/stacking-context-z-order" rel="nofollow">my test</a> make a lot more sense -- but then I no longer understand what the distinction is between a stacking context and a grouping property. Is it a distinction that's only relevant to SVG?</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/w3c/csswg-drafts/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="tR2M2jWvg604RWh7kf-jc1a4s6XWabrYi0P1Ur5bzZFLDiC1RJayQvWB5jNLpUp0JHGiszUolESgiu2DIDW7Mg" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDg1ODE1ODQ5MQ=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details 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1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="MDE1OlJlZmVyZW5jZWRFdmVudDQ4Njg1NTEyMjc="> <div class="TimelineItem" > <span class="TimelineItem-badge"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-cross-reference"> <path d="M2.75 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h4.5a.25.25 0 0 0 .25-.25v-2.5a.75.75 0 0 1 1.5 0v2.5A1.75 1.75 0 0 1 13.25 13H9.06l-2.573 2.573A1.458 1.458 0 0 1 4 14.543V13H2.75A1.75 1.75 0 0 1 1 11.25v-7.5C1 2.784 1.784 2 2.75 2h5.5a.75.75 0 0 1 0 1.5ZM16 1.25v4.146a.25.25 0 0 1-.427.177L14.03 4.03l-3.75 3.75a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734l3.75-3.75-1.543-1.543A.25.25 0 0 1 11.604 1h4.146a.25.25 0 0 1 .25.25Z"></path> </svg> </span> <div class="TimelineItem-body" id="ref-commit-4ab5eed"> <a class="author Link--primary text-bold" data-hovercard-type="user" data-hovercard-url="/users/frivoal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/frivoal">frivoal</a> added a commit that referenced this issue <a href="#ref-commit-4ab5eed" class="Link--secondary"> <relative-time datetime="2021-06-10T02:22:20Z" class="no-wrap">Jun 10, 2021</relative-time> </a> <div class="mt-3"> <div class="js-details-container Details js-socket-channel js-updatable-content" 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<div class="pr-1 flex-auto min-width-0" > <code> <a title="[css-transforms-2] Paint containment causes flattening See #6202" data-pjax="true" class="Link--secondary markdown-title" href="/w3c/csswg-drafts/commit/4ab5eede9d9ead25796c2ef8fe64ccc90e2f42d2">[css-transforms-2] Paint containment causes flattening</a> </code> <span class="hidden-text-expander inline"> <button type="button" class="ellipsis-expander js-details-target" aria-expanded="false">…</button> </span> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="MDY6Q29tbWl0OTI1MjI2ODo0YWI1ZWVkZTlkOWVhZDI1Nzk2YzJlZjhmZTY0Y2NjOTBlMmY0MmQy" data-targets="batch-deferred-content.inputs" autocomplete="off" /> <input type="hidden" name="badge_size" value="small" data-targets="batch-deferred-content.inputs" autocomplete="off" /> <input type="hidden" name="dropdown_direction" value="w" data-targets="batch-deferred-content.inputs" autocomplete="off" /> </batch-deferred-content> </div> <div class="pr-1 flex-shrink-0" style="width: 16px;"> </div> <!-- ml-1 is added to accommodate "clock" icon --> <div class="text-right ml-1"> <code> <a href="/w3c/csswg-drafts/commit/4ab5eede9d9ead25796c2ef8fe64ccc90e2f42d2" class="Link--secondary">4ab5eed</a> </code> </div> </div> </div> <div class="Details-content--hidden mt-2"> <pre class="color-fg-muted ws-pre-wrap">See <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="854892896" data-permission-text="Title is private" data-url="https://github.com/w3c/csswg-drafts/issues/6202" data-hovercard-type="issue" data-hovercard-url="/w3c/csswg-drafts/issues/6202/hovercard" href="https://github.com/w3c/csswg-drafts/issues/6202">#6202</a></pre> </div> </div> </div> </div> </div> <div class="TimelineItem js-targetable-element" data-team-hovercards-enabled id="event-4868551498"> <div class="TimelineItem-badge "> 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data-hovercard-type="user" data-hovercard-url="/users/frivoal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/frivoal">frivoal</a> added <a id="label-a83d69" href="/w3c/csswg-drafts/labels/Closed%20Accepted%20by%20CSSWG%20Resolution" data-name="Closed Accepted by CSSWG Resolution" style="--label-r:14;--label-g:138;--label-b:22;--label-h:123;--label-s:81;--label-l:29;" data-view-component="true" class="IssueLabel hx_IssueLabel d-inline-block v-align-middle"> Closed Accepted by CSSWG Resolution </a> <a id="label-bf9b8f" href="/w3c/csswg-drafts/labels/Needs%20Testcase%20%28WPT%29" data-name="Needs Testcase (WPT)" style="--label-r:83;--label-g:25;--label-b:231;--label-h:256;--label-s:81;--label-l:50;" data-view-component="true" class="IssueLabel hx_IssueLabel d-inline-block v-align-middle"> Needs Testcase (WPT) </a> labels <a href="#event-4868551498" class="Link--secondary"><relative-time datetime="2021-06-10T02:22:28Z" class="no-wrap">Jun 10, 2021</relative-time></a> </div> </div> <div class="TimelineItem"> <div class="TimelineItem-badge"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-cross-reference"> <path d="M2.75 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h4.5a.25.25 0 0 0 .25-.25v-2.5a.75.75 0 0 1 1.5 0v2.5A1.75 1.75 0 0 1 13.25 13H9.06l-2.573 2.573A1.458 1.458 0 0 1 4 14.543V13H2.75A1.75 1.75 0 0 1 1 11.25v-7.5C1 2.784 1.784 2 2.75 2h5.5a.75.75 0 0 1 0 1.5ZM16 1.25v4.146a.25.25 0 0 1-.427.177L14.03 4.03l-3.75 3.75a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734l3.75-3.75-1.543-1.543A.25.25 0 0 1 11.604 1h4.146a.25.25 0 0 1 .25.25Z"></path> </svg> </div> <div class="TimelineItem-body" > <div > <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/frivoal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/frivoal"><img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/113268?s=40&u=dba0a73d683a9db9cf6dfd6660a306e802d4c07e&v=4" width="20" height="20" alt="@frivoal" /></a> <a class="author Link--primary text-bold" data-hovercard-type="user" data-hovercard-url="/users/frivoal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/frivoal">frivoal</a> mentioned this issue <a class="Link--secondary" href="#ref-issue-916825928" > <relative-time datetime="2021-06-10T02:33:13Z" class="no-wrap">Jun 10, 2021</relative-time> </a> </div> <div class="mt-2 d-flex flex-items-start flex-column flex-md-row"> <div class="flex-auto wb-break-word" id="ref-issue-916825928" > <a href="/w3c/csswg-drafts/issues/6374" class="Link--primary f4 text-bold markdown-title" data-hovercard-type="issue" data-hovercard-url="/w3c/csswg-drafts/issues/6374/hovercard"> [css-transforms-2][css-overflow-3] overflow: clip and 3d transforms <span class="color-fg-muted text-normal" >#6374</span> </a> </div> <div class="flex-shrink-0 my-1 my-md-0 ml-md-3"> <span title="Status: Open" data-view-component="true" class="State State--open State--small d-flex flex-items-center"> <svg aria-hidden="true" height="12" viewBox="0 0 16 16" version="1.1" width="12" data-view-component="true" class="octicon octicon-issue-opened flex-items-center mr-1"> <path d="M8 9.5a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path><path d="M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0ZM1.5 8a6.5 6.5 0 1 0 13 0 6.5 6.5 0 0 0-13 0Z"></path> </svg> Open </span> </div> </div> </div> </div> <div class="TimelineItem js-targetable-element" data-team-hovercards-enabled id="event-4868578312"> <div class="TimelineItem-badge "> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-tag color-fg-inherit"> <path d="M1 7.775V2.75C1 1.784 1.784 1 2.75 1h5.025c.464 0 .91.184 1.238.513l6.25 6.25a1.75 1.75 0 0 1 0 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href="/w3c/csswg-drafts/labels/Commenter%20Response%20Pending" data-name="Commenter Response Pending" style="--label-r:251;--label-g:202;--label-b:4;--label-h:48;--label-s:96;--label-l:50;" data-view-component="true" class="IssueLabel hx_IssueLabel d-inline-block v-align-middle"> Commenter Response Pending </a> label <a href="#event-4868578312" class="Link--secondary"><relative-time datetime="2021-06-10T02:34:27Z" class="no-wrap">Jun 10, 2021</relative-time></a> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="MDEyOklzc3VlQ29tbWVudDg1ODIzMzE0OA=="> <div class="TimelineItem js-comment-container" data-gid="MDEyOklzc3VlQ29tbWVudDg1ODIzMzE0OA==" data-url="/w3c/csswg-drafts/comments/MDEyOklzc3VlQ29tbWVudDg1ODIzMzE0OA==/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/frivoal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/frivoal"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/113268?s=80&u=dba0a73d683a9db9cf6dfd6660a306e802d4c07e&v=4" width="40" height="40" alt="@frivoal" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-858233148"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="ba67c45989945ebb34a2a1775eeb73501c50de94286e4bc4eb1df50c6bdb385d"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-858233148-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has been invited to collaborate on the csswg-drafts repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Collaborator</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/frivoal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/frivoal">frivoal</a> </strong> commented <a href="#issuecomment-858233148" id="issuecomment-858233148-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-06-10T02:34:33Z" class="no-wrap">Jun 10, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Fixed the spec in <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/w3c/csswg-drafts/commit/4ab5eede9d9ead25796c2ef8fe64ccc90e2f42d2/hovercard" href="https://github.com/w3c/csswg-drafts/commit/4ab5eede9d9ead25796c2ef8fe64ccc90e2f42d2"><tt>4ab5eed</tt></a>. Opened a separate issue (<a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="916825928" data-permission-text="Title is private" data-url="https://github.com/w3c/csswg-drafts/issues/6374" data-hovercard-type="issue" data-hovercard-url="/w3c/csswg-drafts/issues/6374/hovercard" href="https://github.com/w3c/csswg-drafts/issues/6374">#6374</a>) to follow up on <code class="notranslate">overflow: clip</code>.</p> <p dir="auto">If any other subthread of this issue needs continued discussion, I suggest opening a separate issue.</p> <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/dbaron">@dbaron</a>, if that seems fine by you, can you close the issue?</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/w3c/csswg-drafts/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="lnimDrlApajTLZGZUa_hJcG7q-kD5hfGlllRyHQqWPFoawphyHmURx7pH9GL9Qgis3K6_-CnOVq9kEkZ6kQuUg" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDg1ODIzMzE0OA=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium 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0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="MDEyOklzc3VlQ29tbWVudDg1ODg1OTAyNA=="> <div class="TimelineItem js-comment-container" data-gid="MDEyOklzc3VlQ29tbWVudDg1ODg1OTAyNA==" data-url="/w3c/csswg-drafts/comments/MDEyOklzc3VlQ29tbWVudDg1ODg1OTAyNA==/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/248721?s=80&v=4" width="40" height="40" alt="@dbaron" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-858859024"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="1190a017bfc058d4f563bb12ebd413efb70abf8f881a6024b4e952265a6dee89"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-858859024-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user is a member of the w3c organization." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Member</span> </span> <span aria-label="This user is the author of this issue." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/dbaron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/dbaron">dbaron</a> </strong> commented <a href="#issuecomment-858859024" id="issuecomment-858859024-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-06-10T18:12:14Z" class="no-wrap">Jun 10, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Seems fine to me.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container 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data-hovercard-url="/users/chrishtr/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/chrishtr">chrishtr</a> </strong> commented <a href="#issuecomment-858877529" id="issuecomment-858877529-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2021-06-10T18:29:26Z" class="no-wrap">Jun 10, 2021</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <blockquote> <p dir="auto">but then I no longer understand what the distinction is between a stacking context and a grouping property. Is it a distinction that's only relevant to SVG?</p> </blockquote> <p dir="auto">The distinction is that not all grouping properties induce stacking contexts - in particular, overflow clipping. An unfortunate concession to web compatibility..</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/w3c/csswg-drafts/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="hdYwYVODmRTM669nBmltYvyqMEq2INgBIRxagiJqObt7xZwOIrqo-wEvIS_cM4RljmMhXFVh9p0K1UJTvARPGA" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDg1ODg3NzUyOQ=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-858877529-edit-form" data-turbo="false" action="/w3c/csswg-drafts/issue_comments/858877529" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="jTJljSEqbSLsJaGukntChEzeis5wkuLqA8THVKL9VKsbvev3u8EupEd4ziPnspH0loQe1foyfT6eigPt+A8VHQ==" /> <include-fragment loading="lazy" src="/w3c/csswg-drafts/issue_comments/858877529/edit_form?textarea_id=issuecomment-858877529-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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