8bccf06ea6
Collapsing thumb causes frame of scrollbar to cache an incorrect pref size, which makes it not able to appear in certain cases. This patch changes it to use "visibility: hidden" instead so that the thumb is hidden but still contributes to the width of scrollbar. An alternative would be also change the code in nsScrollbarFrame to set something other than collapsed attribute instead, but I'm not sure whether doing that is any better than just adding a rule. We need the rule anyway regardless of what we set on the element. Differential Revision: https://phabricator.services.mozilla.com/D15244
23 lines
367 B
HTML
23 lines
367 B
HTML
<!DOCTYPE html>
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<style>
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#outer {
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scrollbar-width: thin;
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overflow: auto;
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border: 5px solid black;
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background: black;
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width: 200px;
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height: 400px;
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}
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#inner {
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height: 300px;
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}
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</style>
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<div id="outer">
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<div id="inner"></div>
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</div>
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<script>
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// Force a reflow
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document.body.offsetHeight;
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document.getElementById('outer').style.height = '200px';
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</script>
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