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Fix transition toggle & cancellation & delay (servo#35978)
More details in Stylo PR: servo/stylo#145 --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: --> - [x] `./mach build -d` does not report any errors - [x] `./mach test-tidy` does not report any errors - [x] These changes - fixes servo#35833 - fixes servo#35982 <!-- Either: --> - [x] There are new passing test: `css/css-logical/animation-004.html: Transitions from physical to logical update when the direction is changed` Created new test files as well: 1. `css-transitions/transition-remove-and-change-immediate.html` 2. `css-transitions/transition-zero-duration-with-delay.html` 3. `css-transitions/transitioncancel-003.html` <!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.--> <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> cc @Asun0204 @xiaochengh @stevennovaryo Signed-off-by: Euclid Ye <[email protected]>
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‎Cargo.lock

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‎tests/wpt/meta/MANIFEST.json

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[]
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],
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"helper.js": [
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"a37aae918300d1136debbebbfbb75d46259e0bce",
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"0ccfe2648ea297fb55360bfa4e47e371a34a7168",
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[]
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],
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"import-green.css": [
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{}
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]
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],
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"transition-remove-and-change-immediate.html": [
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"717436436302504ce8f068f56dfbba4a6671cce5",
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[
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null,
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{}
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]
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],
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"transition-reparented.html": [
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"3dfd19425fcaa76051618113bfb4793baf06f364",
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[
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null,
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{}
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]
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],
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"transition-zero-duration-with-delay.html": [
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"0b6b9c37a9b2a1c225889c1f362beb9d559c25d7",
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[
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null,
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{}
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]
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],
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"transitioncancel-001.html": [
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"6546195259fd9d1870942402fa80d1cb0ff13ea4",
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[
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{}
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]
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],
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"transitioncancel-003.html": [
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"1c47b3084d486eaaa8218defa689bd7cc4af357c",
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[
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null,
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{}
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]
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],
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"transitionevent-interface.html": [
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"a40ba4537518361c13aab1d9b0648387f7c88aaa",
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[

‎tests/wpt/meta/css/css-logical/animation-004.html.ini

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[Transitions update when the writing-mode is changed through a CSS variable]
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expected: FAIL
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[Transitions from physical to logical update when the direction is changed]
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expected: FAIL

‎tests/wpt/tests/css/css-transitions/support/helper.js

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return sheet.cssRules.length == 1;
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};
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/**
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* Waits for a 'transitionend' event to fire on the given element.
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*
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* @param element The DOM element to listen for the transitionend event on.
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* @returns {Promise<void>} A promise that resolves when the transitionend event is fired.
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*/
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root.waitForTransitionEnd = function(element) {
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return new Promise(resolve => {
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element.addEventListener('transitionend', resolve, { once: true });
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});
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};
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})(window);

‎tests/wpt/tests/css/css-transitions/transition-remove-and-change-immediate.html

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<!doctype html>
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<html>
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<head>
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<meta charset=utf-8>
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<title>CSS Transitions Test: Removing transition and changing width applies change immediately</title>
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<meta name="assert" content="When a transition is removed and a width is changed after a previous transition completes, the change is immediate.">
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<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="./support/helper.js"></script>
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</head>
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<body>
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<div id="log"></div>
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<script>
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promise_test(async t => {
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const div = addDiv(t, {
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style: 'transition: width 0.02s; width: 0px;'
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});
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// Flush initial state
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getComputedStyle(div).width;
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div.style.width = '100px';
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// Wait for transition to complete
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await waitForTransitionEnd(div);
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// Verify the width after first transition
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const afterFirst = getComputedStyle(div).width;
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assert_equals(afterFirst, '100px', 'width should be 100px after first transition');
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// Set width back to 0 and remove transition
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div.style.width = '0px';
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div.style.transition = '';
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// Force layout update to ensure style computation
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const afterSecond = getComputedStyle(div).width;
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// Check width is immediately updated
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assert_equals(
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afterSecond,
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'0px',
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'width should reset to 0 immediately'
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);
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}, 'Removing transition and changing width applies change immediately');
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</script>
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</body>
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</html>

‎tests/wpt/tests/css/css-transitions/transition-zero-duration-with-delay.html

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<!doctype html>
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<html>
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<head>
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<meta charset=utf-8>
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<title>CSS Transitions Test: 0-duration transition with delay applies after delay</title>
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<meta name="assert" content="Transition with 0s duration and 0.3s delay applies property change after delay period">
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<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="./support/helper.js"></script>
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</head>
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<body>
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<div id="log"></div>
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<script>
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promise_test(async t => {
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const div = addDiv(t, {
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style: 'transition: width 0.1s; width: 0px;'
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});
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// Flush initial state
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getComputedStyle(div).width;
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// First transition to 100px
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div.style.width = '100px';
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await waitForTransitionEnd(div);
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// Change transition to 0s duration with 300ms delay
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div.style.transition = 'width 0s linear 0.3s';
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// Set width back to 0
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const startTime = performance.now();
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div.style.width = '0px';
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// Immediate check - should NOT have changed yet
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const computedStart = getComputedStyle(div).width;
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assert_equals(
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computedStart,
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'100px',
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'Width should remain at 100px initially'
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);
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// Wait for transitionend (should trigger after 300ms delay)
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await waitForTransitionEnd(div);
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// Verify final state
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const finalWidth = getComputedStyle(div).width;
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assert_equals(
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finalWidth,
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'0px',
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'Width should reset to 0 after delay'
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);
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}, '0-duration transition with delay applies change after delay period');
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</script>
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</body>
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</html>

‎tests/wpt/tests/css/css-transitions/transitioncancel-003.html

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<!doctype html>
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<html>
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<head>
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<meta charset=utf-8>
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<title>CSS Transitions Test: Changing transition properties mid-transition</title>
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<meta name="assert" content="When transition properties are changed mid-transition, the original transition completes and new transition parameters apply to subsequent changes">
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<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="./support/helper.js"></script>
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</head>
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<body>
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<div id="log"></div>
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<script>
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promise_test(async t => {
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const div = addDiv(t, {
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style: 'transition: width 100ms; width: 0px;'
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});
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// Flush initial state
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getComputedStyle(div).width;
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// Start first transition to 100px
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div.style.width = '100px';
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// Wait until transition starts running
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await new Promise(resolve => {
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div.addEventListener('transitionrun', resolve, { once: true });
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});
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// MID-TRANSITION CHANGE: Switch to 0s duration + 100ms delay
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div.style.transition = 'width 0s 100ms';
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assert_not_equals(
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getComputedStyle(div).width,
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'100px',
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'Width should not reach 100px yet'
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);
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// Trigger new width change mid-transition
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div.style.width = '0px';
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assert_not_equals(
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getComputedStyle(div).width,
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'0px',
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'Width should not changed to 0px immediately'
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);
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await waitForTransitionEnd(div);
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// Final computed style
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assert_equals(
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getComputedStyle(div).width,
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'0px',
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'Final width should be 0px'
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);
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}, 'Mid-transition transition changes affect subsequent transitions');
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</script>
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</body>
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</html>

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