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chromium/content/test/data/accessibility/html/progress.html 

<!--
@MAC-ALLOW:AXMinValue*
@MAC-ALLOW:AXMaxValue*
@MAC-ALLOW:AXRoleDescription
@WIN-ALLOW:valuetext*
@WIN-ALLOW:currentValue=*
@WIN-ALLOW:minimumValue=*
@WIN-ALLOW:maximumValue=*
@AURALINUX-ALLOW:valuetext*
@AURALINUX-ALLOW:indeterminate
-->
<!DOCTYPE html>
<html>
<body>
<progress value="22" max="100"></progress>
<progress></progress>  <!-- indeterminate -->
</body>
</html>