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chromium/third_party/blink/web_tests/fast/css/live-cssrules.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
	<title>Test case for bug 17082</title>
	<style type="text/css">
	</style>
</head>
<body>
<script type="text/javascript"> 
 var rules = document.styleSheets[0].cssRules;
 document.styleSheets[0].insertRule("img { height: 40px; }", 0);
 if (document.styleSheets[0].cssRules.length && rules.length) document.write("<p>Test: PASSED</p>"); else document.write("<p style=\"background-color:red;\">Test: FAILED</p>");
</script>

</body>
</html>