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chromium/content/test/data/accessibility/aria/aria-valuenow.html 

<!--
@MAC-ALLOW:AXRoleDescription=*
@MAC-ALLOW:AXValue=*
@WIN-ALLOW:currentValue*
@WIN-ALLOW:xml-roles*
-->
<!DOCTYPE html>
<html>
<body>
  <div role="progressbar" aria-valuenow="3"></div>
</body>
</html>