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chromium/content/test/data/accessibility/accname/desc-img-one-valid-describedby.html 

<!--
@BLINK-DENY:name*
-->
<!doctype html>
<html>
<body>
<img src="foo.jpg" id="test" alt="test" aria-describedby="t1 t2 t3">
<div id="t2">foo</div>
</body>
</html>