[gestures] Apply default styles to ::overscroll-* [chromium/src : main]

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Rune Lillesveen (Gerrit)

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Nov 25, 2025, 6:34:30 AMNov 25
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Code-Review+1

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Patchset-level comments
File-level comment, Patchset 4 (Latest):
Rune Lillesveen . resolved

lgtm

File third_party/blink/renderer/core/css/selector_checker.cc
Line 3146, Patchset 4 (Latest): return element.GetPseudoIdForStyling() == pseudo_id;
Rune Lillesveen . resolved

Note: If these were author-exposed, you would strictly have had to deal with dynamic_pseudo and context.pseudo_id (for getComputedStyle).

File third_party/blink/renderer/core/style/computed_style_constants.h
Line 129, Patchset 4 (Latest): kLastPublicPseudoId = kPseudoIdOverscrollClientArea,
Rune Lillesveen . unresolved

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Robert Flack (Gerrit)

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Nov 25, 2025, 9:20:19 AMNov 25
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Robert Flack voted and added 2 comments

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File third_party/blink/renderer/core/css/selector_checker.cc
Line 3146, Patchset 4 (Latest): return element.GetPseudoIdForStyling() == pseudo_id;
Rune Lillesveen . resolved

Note: If these were author-exposed, you would strictly have had to deal with dynamic_pseudo and context.pseudo_id (for getComputedStyle).

Robert Flack

Thanks, good to know.

File third_party/blink/renderer/core/style/computed_style_constants.h
Line 129, Patchset 4 (Latest): kLastPublicPseudoId = kPseudoIdOverscrollClientArea,
Rune Lillesveen . resolved

Was this the change that solved your issue?

Robert Flack

Yes, this is the one. Per my other comment we have a check here https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/css/selector_checker.cc?q=file:selector_checker.cc%20pseudo_id%5C%20%5C%3C%5C%3D%5C%20kLastPublicPseudoId&ss=chromium%2Fchromium%2Fsrc that was critical to descending to the pseudo-element in selector matching. Without this, we try to match against the owning element.

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    Vladimir Levin (Gerrit)

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    Nov 25, 2025, 9:20:35 AMNov 25
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    Vladimir Levin voted Code-Review+1

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    Robert Flack (Gerrit)

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    Nov 25, 2025, 9:22:29 AMNov 25
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    Robert Flack . resolved

    +chrishtr for third_party/blink/public

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    Chris Harrelson (Gerrit)

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    blink/public LGTM

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    Robert Flack (Gerrit)

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    Chromium LUCI CQ (Gerrit)

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    Nov 25, 2025, 1:42:05 PMNov 25
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    Chromium LUCI CQ submitted the change with unreviewed changes

    Unreviewed changes

    4 is the latest approved patch-set.
    The change was submitted with unreviewed changes in the following files:

    ```
    The name of the file: third_party/blink/renderer/core/dom/element_test.cc
    Insertions: 3, Deletions: 9.

    The diff is too large to show. Please review the diff.
    ```

    Change information

    Commit message:
    [gestures] Apply default styles to ::overscroll-*

    Sets UA styles for ::overscroll-area-parent and ::overscroll-client-area.
    Bug: 457468300
    Change-Id: Ib6fe138e8b18319f42563144fab35a142af710d3
    Reviewed-by: Chris Harrelson <chri...@chromium.org>
    Commit-Queue: Robert Flack <fla...@chromium.org>
    Reviewed-by: Vladimir Levin <vmp...@chromium.org>
    Reviewed-by: Rune Lillesveen <fut...@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#1549924}
    Files:
    • M third_party/blink/public/blink_resources.grd
    • M third_party/blink/renderer/core/css/css_default_style_sheets.cc
    • M third_party/blink/renderer/core/css/css_default_style_sheets.h
    • M third_party/blink/renderer/core/css/css_selector.cc
    • M third_party/blink/renderer/core/css/invalidation/rule_invalidation_data_visitor.cc
    • A third_party/blink/renderer/core/css/overscroll.css
    • M third_party/blink/renderer/core/css/parser/css_selector_parser.cc
    • M third_party/blink/renderer/core/css/resolver/style_resolver.cc
    • M third_party/blink/renderer/core/css/rule_set.cc
    • M third_party/blink/renderer/core/css/selector_checker.cc
    • M third_party/blink/renderer/core/dom/element_test.cc
    • M third_party/blink/renderer/core/style/computed_style_constants.h
    Change size: M
    Delta: 12 files changed, 145 insertions(+), 14 deletions(-)
    Branch: refs/heads/main
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    Gerrit-Change-Number: 7167567
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    Gerrit-Reviewer: Chromium LUCI CQ <chromiu...@luci-project-accounts.iam.gserviceaccount.com>
    Gerrit-Reviewer: Robert Flack <fla...@chromium.org>
    Gerrit-Reviewer: Rune Lillesveen <fut...@chromium.org>
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