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chromium/third_party/blink/web_tests/fast/forms/select/HTMLOptionElement_selected2.html 

<!DOCTYPE html>
<html>
  <body>
    <p>This test checks that the selected property of an option is initialized correctly. https://bugs.webkit.org/show_bug.cgi?id=32641</p>
    <p>Before querying selectedIndex, [theOption].selected = <span id="logOne"></span></p>
    <p>[theSelect].selectedIndex = <span id="logTwo"></span></p>
    <p>After querying selectedIndex, [theOption].selected = <span id="logThree"></span></p>
    <select id="theSelect" style="display:none">
      <option id="theOption">lalala</option>
    </select>
    <script>
      if (window.testRunner)
        testRunner.dumpAsText();
      var o = document.getElementById('theOption');
      document.getElementById('logOne').textContent = o.selected;
      document.getElementById('logTwo').textContent = document.getElementById('theSelect').selectedIndex;
      document.getElementById('logThree').textContent = o.selected;
    </script>
 </body>
</html>