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61 lines
2 KiB
HTML
61 lines
2 KiB
HTML
<!DOCTYPE html>
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<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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<head>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style type="text/css">
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#scroller {
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overflow: scroll;
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width: 500px;
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height: 500px;
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}
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#anchor {
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position: relative;
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width: 100px;
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height: 100px;
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margin-top: 100px;
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margin-bottom: 1000px;
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background-color: blue;
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}
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#positioned {
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position: absolute;
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width: 10px;
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height: 10px;
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top: -200px;
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background-color: yellow;
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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="anchor">
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<div id="positioned">
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</div>
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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 positioned = document.querySelector('#positioned');
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// Scroll down to select #anchor as an anchor node
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scroller.scrollTop = 20;
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// Move #positioned downwards, which will move the unclamped scrollable
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// overflow rect of #anchor downards as well
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positioned.style.top = '-180px';
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// To trigger the bug that this regression tests in Gecko, we need
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// to not take Gecko's relative positioning fast path. To do
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// this, change the 'left' of #positioned from 'auto' to '0px'.
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positioned.style.left = '0px';
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// The implementation should clamp the scrollable overflow rect
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// before the start-edge of the anchor node, and not apply an
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// adjustment
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assert_equals(scroller.scrollTop, 20);
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}, 'scrollable overflow before the start-edge of the anchor node should be clamped');
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</script>
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</body>
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</html>
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