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firefox/testing/web-platform/tests/css/css-will-change/will-change-stacking-context-opacity-2.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>CSS Test: will-change: opacity should create a stacking context for inlines.</title>
<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1119651">
<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
<link rel="match" href="green-square-100-by-100-ref.html">
<style>
html, body { margin: 0; }
.indicator {
position: absolute;
width: 100px;
height: 100px;
background: green;
z-index: 1;
}
.will-change-opacity {
will-change: opacity;
width: 100px;
height: 100px;
}
.top {
position: absolute;
width: 100px;
height: 100px;
background: red;
z-index: 3;
}
</style>
<div class="indicator"></div>
<span class="will-change-opacity">
<!-- Because will-change: opacity creates a stacking context, this child
remains on bottom even though it has a higher z-index than the indicator
box. -->
<div class="top"></div>
</span>