<html>
<body>
This is a test of dynamic rem unit scaling.  Changes to the root element's font size need to cause dependent elements in the document tree
to update as well.
<div style="font-size:10px">
This text should be small.
<div style="font-size:1rem">
This text should match the root (and be 24px).
</div>
</div>
<script>
document.body.offsetWidth;
document.documentElement.style.fontSize = '24px';
</script>
</body>
</html>