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firefox/testing/web-platform/tests/css/css-masking/clip/clip-no-stacking-context.html
Daniel Baumann 5e9a113729
Adding upstream version 140.0.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-25 09:37:52 +02:00

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HTML

<!DOCTYPE html>
<meta charset="utf-8">
<title>Clip does not create a stacking context</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#propdef-clip">
<link rel="match" href="clip-no-stacking-context-ref.html">
<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
<style>
#bottom {
position: absolute;
width: 100px;
height: 100px;
background: red;
z-index: 1;
}
#clip {
position: absolute;
clip: rect(0px, 100px, 100px, 0px);
}
#top {
position: absolute;
width: 100px;
height: 100px;
background: green;
z-index: 3;
}
</style>
<p>Expected: A green box with no red visible.</p>
<div id="bottom"></div>
<!-- If #clip creates a stacking context, it will be below #bottom (which has a
higher z-index) which will force #top to be below #bottom as well. This
should not happen because #clip should not create a stacking context. -->
<div id="clip">
<div id="top"></div>
</div>