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58 lines
1.8 KiB
HTML
58 lines
1.8 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<html>
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<head>
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<style type="text/css">
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#scroller {
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overflow: scroll;
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height: 500px;
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height: 500px;
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}
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#before {
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height: 200px;
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}
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#anchor {
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position: relative;
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width: 200px;
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height: 200px;
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margin-bottom: 500px;
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background-color: blue;
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/*
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* To trigger the Gecko bug that's being regression-tested here, we
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* need 'top' to start out at a non-'auto' value, so that the
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* dynamic change can trigger Gecko's "RecomputePosition" fast path
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*/
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top: 0px;
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}
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</style>
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</head>
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<body>
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<div id="scroller">
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<div id="before">
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</div>
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<div id="anchor">
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</div>
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</div>
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<script type="text/javascript">
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test(() => {
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let scroller = document.querySelector('#scroller');
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let before = document.querySelector('#before');
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let anchor = document.querySelector('#anchor');
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// Scroll down to select #anchor as a scroll anchor
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scroller.scrollTop = 200;
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// Adjust the 'top' of #anchor, which should trigger a suppression
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anchor.style.top = '10px';
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// Expand #before and make sure we don't apply an adjustment
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before.style.height = '300px';
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assert_equals(scroller.scrollTop, 200);
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}, 'Positioned ancestors with dynamic changes to offsets trigger scroll suppressions.');
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</script>
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</body>
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</html>
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