43 lines
1.2 KiB
HTML
43 lines
1.2 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: behavior when a shadow root is inserted while transitioning</title>
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<meta name="assert" content="Checks the addition of a shadow root does not affect an in-flight transition">
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<link rel="help" href="https://drafts.csswg.org/css-transitions/">
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<script src="/resources/testharness.js" type="text/javascript"></script>
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<script src="/resources/testharnessreport.js" type="text/javascript"></script>
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<script src="./support/helper.js" type="text/javascript"></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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test(t => {
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// Start a 100s transition 50% of the way through
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const div = addDiv(t, {
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style: 'transition: height 100s -50s linear; height: 0px',
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});
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getComputedStyle(div).height;
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div.style.height = '100px';
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assert_equals(
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getComputedStyle(div).height,
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'50px',
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'Transition should be initially 50% complete'
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);
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// Add a shadow root
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div.attachShadow({ mode: "open" });
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// The transition on the height property should not have been canceled
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assert_equals(
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getComputedStyle(div).height,
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'50px',
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'Transition should not have been canceled'
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);
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}, 'addition of a shadow root should not cancel in-flight transitions');
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</script>
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</body>
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</html>
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