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

<!--
@WIN-DENY:name*
@WIN-ALLOW:STATE_SYSTEM_*
@MAC-ALLOW:AXRoleDescription=*
@AURALINUX-ALLOW:checked
@AURALINUX-DENY:checkable
@AURALINUX-ALLOW:checkable:*
@AURALINUX-ALLOW:indeterminate
@AURALINUX-ALLOW:pressed
@AURALINUX-ALLOW:xml-roles:*
-->
<html>
<body>
<div tabindex=0 role="button">Regular button</div>
<div tabindex=0 role="button" aria-pressed="false">Toggle button</div>
<div tabindex=0 role="button" aria-pressed="true">Toggle button</div>
<div tabindex=0 role="button" aria-pressed="mixed">Toggle button</div>
</body>
</html>