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Code Issues Projects Releases Packages Wiki Activity Actions 9

LibWeb: Always update computed properties for finished animations

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If an animation got to its finished state before its target's computed
properties could be updated, we would end up with invalid styles. Do not
skip finished animations, but prevent effect invalidation on timeline
updates if the animation is already finished.

This fixes the CI flake on WPT test
`css/css-transitions/inherit-height-transition.html`.
This commit is contained in:
Jelle Raaijmakers 2025-08-26 14:23:30 +02:00 • committed by Jelle Raaijmakers
commit 84c4eb7aa9
Notes: github-actions[bot] 2025-08-26 16:49:03 +00:00
3 changed files with 10 additions and 10 deletions
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11
Libraries/LibWeb/Animations/Animation.cpp
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2023-2024, Matthew Olsson <mattco@serenityos.org>.
* Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -934,7 +935,9 @@ GC::Ptr<DOM::Document> Animation::document_for_timing() const
void Animation::notify_timeline_time_did_change()
{
update_finished_state(DidSeek::No, SynchronouslyNotify::Yes);
// Update finished state if not already finished; prevents recurring invalidation when the timeline updates.
if (!m_is_finished)
update_finished_state(DidSeek::No, SynchronouslyNotify::Yes);
// Act on the pending play or pause task
if (m_pending_play_task == TaskState::Scheduled) {
@ -1330,13 +1333,11 @@ GC::Ref<WebIDL::Promise> Animation::current_finished_promise() const
void Animation::invalidate_effect()
{
if (!m_effect) {
if (!m_effect)
return;
}
if (auto* target = m_effect->target(); target) {
if (auto* target = m_effect->target())
target->document().set_needs_animated_style_update();
}
}
Animation::Animation(JS::Realm& realm)

5
Libraries/LibWeb/DOM/Document.cpp
View file

@ -1574,11 +1574,10 @@ void Document::update_animated_style_if_needed()
for (auto& timeline : m_associated_animation_timelines) {
for (auto& animation : timeline->associated_animations()) {
if (animation->is_idle() || animation->is_finished())
if (animation->is_idle())
continue;
if (auto effect = animation->effect()) {
if (auto effect = animation->effect())
effect->update_computed_properties(context);
}
}
}

4
Tests/LibWeb/Text/expected/wpt-import/css/css-transitions/transitioncancel-003.txt
View file

@ -2,5 +2,5 @@ Harness status: OK
Found 1 tests
1 Fail
Fail Mid-transition transition changes affect subsequent transitions
1 Pass
Pass Mid-transition transition changes affect subsequent transitions