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[css-view-transitions-1] Ignore names from shadow DOM #10306

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May 13, 2024

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Applies resolution at #10145.

@khushalsagar khushalsagar requested review from nt1m and vmpstr May 10, 2024 19:10
@khushalsagar khushalsagar merged commit 58350b3 into w3c:main May 13, 2024
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webkit-commit-queue pushed a commit to nt1m/WebKit that referenced this pull request May 13, 2024
https://bugs.webkit.org/show_bug.cgi?id=273883
rdar://127995859

Reviewed by Antti Koivisto.

Corresponding spec issue: w3c/csswg-drafts#10145
Corresponding spec PR: w3c/csswg-drafts#10306

This ignores view-transition names from shadow DOM, given the pseudo-elements are linked to the document element,
exposing shadow DOM names to the view transition pseudo-elements would be a violation of shadow DOM principles.

We don't check for the tree scope directly in `forEachRendererInPaintOrder` because a shadow DOM element might have
flat tree descendants that have an outer tree scope.

We also use the `Styleable`'s element instead of `RenderElement`'s element because for pseudo-elements we want to consider
the associated element's tree scope.

* LayoutTests/TestExpectations:
* LayoutTests/platform/glib/TestExpectations:
* Source/WebCore/dom/ViewTransition.cpp:
(WebCore::ViewTransition::captureOldState):
(WebCore::ViewTransition::captureNewState):

Canonical link: https://commits.webkit.org/278704@main
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