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Test Info:

<!DOCTYPE html>
<style>
:root { font-size: 16px; }
.x:root { font-size: 32px; }
body { font-size: 16px; }
.y { width: 1rem; height: 1rem; background-color: blue; }
</style>
<body onload="document.body.offsetWidth; document.documentElement.className = 'x';">
<div><div class=y></div></div>