Hiroyuki Ikezoe
9bb989d132
Per the css-overflow propagation rule [1], 'visible' on the viewport is interpreted as 'auto' and 'clip' is interpreted as 'hidden'. So dynamically toggling the root element's overflow between 'visible' and 'clip' changes the viewport's propagated scrollbar styles between 'auto' and 'hidden'. [1] https://drafts.csswg.org/css-overflow/#overflow-propagation Differential Revision: https://phabricator.services.mozilla.com/D301231
25 lines
919 B
HTML
25 lines
919 B
HTML
<!doctype html>
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<html class="reftest-wait">
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<meta charset="utf-8">
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<title>The viewport scrollbar is updated when the root element's overflow is dynamically changed to 'clip'</title>
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<link rel="help" href="https://drafts.csswg.org/css-overflow/#overflow-propagation">
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<link rel="help" href="https://drafts.csswg.org/css-overflow/#valdef-overflow-clip">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=2040247">
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<link rel="match" href="dynamic-visible-to-clip-002-ref.html">
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<style>
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#fill {
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height: 200vh;
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}
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</style>
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<div id="fill"></div>
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<script>
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onload = function() {
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// Force an initial layout so the viewport scrollbar is present.
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window.unused = document.documentElement.getBoundingClientRect();
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requestAnimationFrame(() => requestAnimationFrame(() => {
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document.documentElement.style.overflow = "clip";
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document.documentElement.removeAttribute("class");
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}));
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}
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</script>
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