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chromium/third_party/blink/web_tests/svg/custom/tref-with-progress-tag-setpseudo-assert.html 

<html>
  <script>
    if (window.testRunner)
      testRunner.dumpAsText();
  </script>
  <a id="B">PASS</a>
  <svg xmlns="http://www.w3.org/1999/xhtml">
    <tref xlink:href="#B"></tref>
  </svg>
  <progress></progress>
</html>