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chromium/third_party/blink/web_tests/external/wpt/mathml/presentation-markup/tokens/mi-mathvariant-1-ref.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
  <math xmlns="http://www.w3.org/1998/Math/MathML">
    <mi mathvariant="normal">cos</mi>
    <mo>&#x2061;</mo>
    <mi>x</mi>
  </math>
</body>
</html>