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chromium/content/test/data/accessibility/event/input-type-text-value-changed.html 

<!--
@WIN-DENY:*
@WIN-ALLOW:EVENT_OBJECT_VALUECHANGE*
@MAC-DENY:*
@MAC-ALLOW:AXValueChanged*AXTextField*
-->
<!DOCTYPE html>
<html>
<body>
<input id="c" type="text" value="Before">
<script>
  function go() {
    document.getElementById('c').value = "After";
  }
</script>
</body>
</html>