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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-contain/contain-paint-stacking-context-001b.html - WPT Dashboard Interop Dashboard
<!DOCTYPE HTML>
<title>'will-change: contain' establishes stacking context.</title>
<link rel="author" title="Psychpsyo" href="mailto:psychpsyo@gmail.com">
<link rel="match" href="contain-paint-stacking-context-001-ref.html">
<style>
div {
width: 100px;
height: 100px;
}
#front {
background-color: green;
/* makes a stacking context and puts this on top */
position: absolute;
z-index: 10;
}
#back {
will-change: contain;
}
#notOnTop {
background-color: red;
/* z-index is higher than on #front, but this should still be covered up because it is inside #back, which has 'will-change: contain' */
position: absolute;
z-index: 1000;
}
</style>
<div id="front"></div>
<div id="back">
<div id="notOnTop"></div>
</div>
Test succeeds if there is no red.