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As discussed in 1, because positioned elements intersect scrollbar gutters,
leaving scrollbars visible ends up testing the scrollbar painting order.

Differential Revision: https://phabricator.services.mozilla.com/D278342

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=2009222
gecko-commit: d7b117c5f728dd7ee9cf4bdfe9b86780874f600a
gecko-reviewers: dholbert

As discussed in [1], because positioned elements intersect scrollbar gutters,
leaving scrollbars visible ends up testing the scrollbar painting order.

[1]: #55022 (comment)

Differential Revision: https://phabricator.services.mozilla.com/D278342

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=2009222
gecko-commit: d7b117c5f728dd7ee9cf4bdfe9b86780874f600a
gecko-reviewers: dholbert
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The review process for this patch is being conducted in the Firefox project.

chorotan and others added 2 commits January 9, 2026 14:20
…l. " for causing Wr failures on anchor-scroll-chained-003.html

This reverts commit 2c006c4d18034afc7a6457d29168fcf2a3f63c7d.

gecko-commit: 0fd696f903f415807ee439301335e511dcb2de4e
gecko-reviewers: dholbert
As discussed in [1], because positioned elements intersect scrollbar gutters,
leaving scrollbars visible ends up testing the scrollbar painting order.

[1]: #55022 (comment)

Differential Revision: https://phabricator.services.mozilla.com/D278342

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=2009222
gecko-commit: 1e2c425254e4731c7aa6c73ccd5f7469d1764e50
gecko-reviewers: dholbert
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Would scrollbar-width: none be a better choice?

lando-prod-mozilla bot pushed a commit to mozilla-firefox/firefox that referenced this pull request Jan 22, 2026
…idth: none, not overflow: hidden. r=layout-anchor-positioning-reviewers,emilio

As per WPT review feedback [1]. No real mechanical difference, but it
communicates the intent better.

[1]: web-platform-tests/wpt#57104

Differential Revision: https://phabricator.services.mozilla.com/D280054
…ot overflow: hidden.

As per WPT review feedback [1]. No real mechanical difference, but it
communicates the intent better.

[1]: #57104

Differential Revision: https://phabricator.services.mozilla.com/D280054

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=2009222
gecko-commit: 233d41b97c03af4d583542229d33a21b82b58191
gecko-reviewers: layout-anchor-positioning-reviewers, emilio
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6 participants