<!doctype html>
<html>
  <head>
    <title>Radical bar visibility</title>
    <meta charset="utf-8"/>
  </head>
  <body>

    <p>This test passes if you see the radical bar.</p>

    <div>
      <!-- blue square to hide the radical symbol -->
      <div style="position: absolute; background: blue; width: 100px; height: 100px;"></div>
    </div>

  </body>
</html>