Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/platform/html-to-os-HELPER-FILE.html 

<!doctype html>
<html>
  <head>
    <title>drag and drop - dragging HTML onto the OS - helper file</title>
  </head>
  <body>

    <p>This is the helper file. Drop the paragraph here --&gt;</p>
    <script type="text/javascript">
document.body.contentEditable = true;
    </script>

  </body>
</html>