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Test Info:
<html class="reftest-wait">
<head>
<style>
div::first-letter { color: red; font-size: 200%; background-color: blue; }
</style>
<script>
function boom() {
document.documentElement.offsetWidth;
var s = document.getElementById("s");
s.remove();
document.documentElement.offsetWidth;
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="boom();">
<div>
<span id="s" style="position: absolute;">abcdefh</span>T
</div>
</body>