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Test Info:

<!doctype html>
<meta charset="utf-8">
<title></title>
<link rel="match" href="width-ref.html">
<hr>
<hr width='50%'>
<hr width='100'>
<hr width='100foo'>
<hr width=' 100 '>
<hr width='100.99'>
<hr width='0'>
<hr width='00'>
<hr width='+0'>
<hr width='+00'>
<hr width='++0'>