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chromium/third_party/blink/web_tests/external/wpt/mathml/presentation-markup/radicals/empty-msqrt-ref.html 

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8"/>
    <title>Empty &lt;msqrt&gt; element (reference)</title>
  </head>
  <body>
    <math><msqrt><mrow></mrow></msqrt></math>
  </body>
</html>