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chromium/third_party/blink/web_tests/external/wpt/mathml/presentation-markup/operators/mo-invisibleoperators-2.html 

<!DOCTYPE html>
<html class="reftest-wait">
  <head>
    <link rel="match" href="mo-invisibleoperators-2-ref.html">
    <link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
    <link rel="help" href="This test verifies proper invalidation after dynamically replacing the text of invisible operators.">
    <meta name="assert" content="https://bugzilla.mozilla.org/show_bug.cgi?id=522393">
  </head>
  <body>
  <math>
    <mo id="mo1">&#x2061;<!-- FUNCTION APPLICATION --></mo>
  </math>
  <p>
  <math>
    <mo id="mo2">&#x2062;<!-- INVISIBLE TIMES --></mo>
  </math>
  <p>
  <math>
    <mo id="mo3">&#x2063;<!-- INVISIBLE SEPARATOR --></mo>
  </math>
  <p>
  <math>
    <mo id="mo4">&#x2064;<!-- INVISIBLE PLUS --></mo>
  </math>
  <p>
  <!-- Test preferred width after dynamic change-->
  <table>
    <tr>
      <td style="border: 1px solid;">
        <math>
          <mo id="mo5">&ApplyFunction;</mo>
        </math>
      </td>
    </tr>
  </table>
  <script type="text/javascript">
    function doTest() {
      document.getElementById('mo1').firstChild.data = '1';
      document.getElementById('mo2').firstChild.data = '2';
      document.getElementById('mo3').firstChild.data = '3';
      document.getElementById('mo4').firstChild.data = '4';
      document.getElementById('mo5').firstChild.data = 'x';
      document.documentElement.removeAttribute("class");
    }
    window.addEventListener("TestRendered", doTest);
  </script>
  </body>
</html>