So that it doesn't create a stacking context and thus alter the paint order. Differential Revision: https://phabricator.services.mozilla.com/D251860
13 lines
192 B
HTML
13 lines
192 B
HTML
<!doctype html>
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<style>
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#cover {
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background: white;
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position: fixed;
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width: 100%;
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height: 200px;
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top: 0;
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border: 1px solid black;
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}
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</style>
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<div id="cover"></div>
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