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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
#b::first-letter { }
#c::first-line { }
</style>
</head>
<body>
This page should not crash Mozilla
<div id="c">
<table>
<div id="b" style="display:table-header-group;">
<q>
text
<div style="position:fixed;">
<q>y</q>
</div>
</q>
</div>
<span style="display: table;"></span>
</div>
</body>
</html>