Scoped VT: Add contain: size and contain-intrinsic-size: auto [chromium/src : main]

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Kevin Ellis (Gerrit)

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Jul 20, 2026, 1:09:03 PM (8 days ago) Jul 20
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Change breaks 3 scope-containment tests. Will hold off on review until this failures are addressed.

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Vladimir Levin (Gerrit)

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Jul 22, 2026, 1:45:19 PM (6 days ago) Jul 22
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Failures addressed!

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Vladimir Levin (Gerrit)

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Jul 22, 2026, 1:45:40 PM (6 days ago) Jul 22
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Kevin Ellis . resolved

Change breaks 3 scope-containment tests. Will hold off on review until this failures are addressed.

Vladimir Levin

PTAL

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Kevin Ellis (Gerrit)

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Jul 23, 2026, 8:50:30 AM (6 days ago) Jul 23
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    Blink W3C Test Autoroller (Gerrit)

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    Jul 23, 2026, 9:04:06 AM (5 days ago) Jul 23
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    Message from Blink W3C Test Autoroller

    Exportable changes to web-platform-tests were detected in this CL and a pull request in the upstream repo has been made: https://github.com/web-platform-tests/wpt/pull/61499.

    When this CL lands, the bot will automatically merge the PR on GitHub if the required GitHub checks pass; otherwise, ecosystem-infra@ team will triage the failures and may contact you.

    WPT Export docs:
    https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md#Automatic-export-process

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    Vladimir Levin (Gerrit)

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    Jul 23, 2026, 9:50:11 AM (5 days ago) Jul 23
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    Chromium LUCI CQ (Gerrit)

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    Jul 23, 2026, 11:26:15 AM (5 days ago) Jul 23
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    Chromium LUCI CQ submitted the change

    Change information

    Commit message:
    Scoped VT: Add contain: size and contain-intrinsic-size: auto

    Based on the resolution (see referenced bug), this adds a flag-guarded
    contain: size and contain-intrinsic-size: auto. The latter is introduced
    via a EffectiveContainIntrinsicSize computed style function.

    R=kev...@chromium.org
    Bug: 535198786
    Change-Id: I4e252fe966e0fa89350175600307fe9b749ddc00
    Commit-Queue: Vladimir Levin <vmp...@chromium.org>
    Reviewed-by: Kevin Ellis <kev...@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#1667123}
    Files:
    • M third_party/blink/renderer/core/css/resolver/style_adjuster.cc
    • M third_party/blink/renderer/core/dom/element.cc
    • M third_party/blink/renderer/core/layout/layout_box.cc
    • M third_party/blink/renderer/core/style/computed_style.h
    • M third_party/blink/renderer/core/style/computed_style_extra_fields.json5
    • M third_party/blink/renderer/core/view_transition/view_transition.cc
    • M third_party/blink/renderer/core/view_transition/view_transition.h
    • M third_party/blink/renderer/platform/runtime_enabled_features.json5
    • A third_party/blink/web_tests/external/wpt/css/css-view-transitions/scoped/scope-containment-during-capture.html
    • A third_party/blink/web_tests/external/wpt/css/css-view-transitions/scoped/scope-containment-pseudo-border-ref.html
    • A third_party/blink/web_tests/external/wpt/css/css-view-transitions/scoped/scope-containment-pseudo-border.html
    • A third_party/blink/web_tests/external/wpt/css/css-view-transitions/scoped/scope-containment-sibling-offset.html
    Change size: L
    Delta: 12 files changed, 381 insertions(+), 18 deletions(-)
    Branch: refs/heads/main
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    Blink W3C Test Autoroller (Gerrit)

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    Jul 23, 2026, 12:15:42 PM (5 days ago) Jul 23
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    Message from Blink W3C Test Autoroller

    The WPT PR for this CL has been merged upstream! https://github.com/web-platform-tests/wpt/pull/61499

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