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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/selection/147.html 

<!doctype html>
<html>
  <head>
    <title>Selection should not be cleared on failed drop</title>
  </head>
  <body>

    <ol>
      <li>Select some text in this sentence and begin dragging it.</li>
      <li>Drop it on this text.</li>
      <li>Pass if the text in step 1 is still selected.</li>
    </ol>

  </body>
</html>