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

<!--
@BLINK-ALLOW:textPosition=*
@WIN-ALLOW:text-position*
@AURALINUX-ALLOW:text-position*
-->
<!DOCTYPE html>
<html>
<body>

<p>This text contains <span role="superscript">superscript</span> text.</p>

</body>
</html>