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Test Info:

<!doctype html>
<title>
Test for bug 1374062: We don't update the root font-size just because the
element has no parent element.
</title>
<style>
:root { font-size: 5px; }
[restyled] { color: green; font-size: 2rem; }
</style>
<div>
Should be green, and have a 10px font-size.
</div>
<script>
getComputedStyle(document.createElement('div')).color;
document.querySelector('div').setAttribute("restyled", "");
</script>