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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Containment Test: contain is not animatable</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name=assert content="the contain property is not animatable">
<style>
div {
border: 50px solid green;
background: red;
position: absolute; /* for shrinkwrap */
contain: strict;
animation-duration: 1s;
animation-name: bad;
animation-play-state: paused;
font-size: 100px;
}
@keyframes bad {
from {
contain: none;
}
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div>&nbsp;</div>