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52 lines
1.4 KiB
HTML
52 lines
1.4 KiB
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>
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