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chromium/third_party/blink/web_tests/external/wpt/css/css-content/attr-case-sensitivity-ref-003.html 

<!doctype html>
<meta charset=utf-8>
<title>attr case-sensitivity reference 003</title>
<style>
    #casematch:before { content: "casematch"; }
</style>
<math id="casematch"></math>