61 lines
1.6 KiB
HTML
61 lines
1.6 KiB
HTML
<!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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