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Box tree construction: only unset pseudo elements if the box is rebuilt#55540

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servo-wpt-sync wants to merge 1 commit intoweb-platform-tests:masterfrom
servo:servo_export_39930
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Box tree construction: only unset pseudo elements if the box is rebuilt#55540
servo-wpt-sync wants to merge 1 commit intoweb-platform-tests:masterfrom
servo:servo_export_39930

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Box Tree re-construction may cause the loss of pseudo element: servo/servo#39225 (comment), then causes transition stucks.
We should only unset pseudo elements if the box is rebuilt.

Testing: fix manual test in servo/servo#39225, CI reports no regression: action
Fixes: servo/servo#39225

cc: @xiaochengh

Reviewed in servo/servo#39930

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The review process for this patch is being conducted in the Servo project.

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👋 Downstream pull request (servo/servo#39930) no longer contains any upstreamable changes. Closing pull request without merging.

@servo-wpt-sync servo-wpt-sync deleted the servo_export_39930 branch October 22, 2025 07:24
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Quirky behavior of particular ::before pseudo element CSS transition

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