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Test Info:
<html>
<head>
<style></style>
<script>
o1 = document.createElement('t');
document.documentElement.appendChild(o1);
document.styleSheets[0].insertRule('* { will-change:an }', 0);
k = new KeyframeEffect(o1, [{'willChange':'s'}], {'':''});
k = null;
SpecialPowers.forceGC();
SpecialPowers.forceCC();
</script>
</head>
</html>