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chromium/third_party/blink/web_tests/svg/animations/animate-startoffset-unitmode.html 

<!DOCTYPE html>
<svg>
  <text>
    <textPath>
      <set attributeName="startOffset" to="50%">
    </textPath>
  </text>
</svg>
<p>Pass if Blink does not crash in debug.</p>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>