54 lines
1.2 KiB
HTML
54 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: ignore fixed and sticky positioning</title>
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<link rel="help" href="https://wicg.github.io/layout-instability/" />
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<style>
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body { height: 2000px; }
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#f1, #f2 {
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position: fixed;
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width: 300px;
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height: 100px;
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left: 100px;
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background: yellow;
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}
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#f1 { top: 0; }
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#f2 { top: 150px; will-change: transform; }
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#s1 {
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position: sticky;
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width: 200px;
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height: 100px;
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left: 450px;
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top: 0;
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background: blue;
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}
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</style>
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<div id='f1'>fixed</div>
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<div id='f2'>fixed composited</div>
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<div id='s1'>sticky</div>
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normal
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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="resources/util.js"></script>
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<script>
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promise_test(async () => {
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const watcher = new ScoreWatcher;
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// Wait for the initial render to complete.
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await waitForAnimationFrames(2);
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// Scroll down by 50px.
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document.scrollingElement.scrollTop = 50;
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// Force a layout.
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document.body.style.height = "2500px";
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// No layout shift should occur as a result of the scroll-triggered
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// repositioning of fixed and sticky elements.
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await waitForAnimationFrames(3);
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assert_equals(watcher.score, 0);
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}, 'Ignore fixed and sticky.');
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</script>
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