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Test Info:

<!DOCTYPE HTML>↩
<html>↩
<head>↩
<style>↩
body::first-letter { float: left; }↩
</style>↩
</head>↩
<body style="width:0">↩
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm↩
<span id="a"></span>↩
<script>↩
document.body.offsetWidth;↩
document.getElementById('a').setAttribute('style', 'display: block;');↩
</script>↩
</body>↩
</html>↩