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Test Info:
- Manifest: layout/reftests/bugs/reftest.list
<!DOCTYPE html>
<html>
<head>
<style>
div:not(:lang(foo)) { display: none; }
</style>
</head>
<body onload="document.body.offsetWidth; document.body.lang = 'foo'">
<div>This text should be visible</div>
</body>
</html>