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chromium
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chromium/content/test/data/accessibility/accname/name-button-labelledby.html 

<!--
@BLINK-DENY:descri*
-->
<!doctype html>
<html>
<body>
<input type="button" aria-labelledby="ID1" id="test">
<div id="ID1">Rich's button</div>
</body>
</html>