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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml">↩
<head>↩
<script>document.documentElement.offsetHeight</script>↩
</head>↩
<body>↩
<div style="height: 3000px; background: lightgreen;"/>↩
<div style="width: 4px; float: left; background: yellow;">↩
A↩
<span style="padding: 5px">↩
<span style="float: left;" />↩
</span>↩
Z↩
</div>↩
</body>↩
</html>↩