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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if output has a custom error, it should not be affected by :valid
pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body onload="document.getElementById('b').setCustomValidity('foo'); document.documentElement.className='';">
<output class='invalid' id='b'>foo</output>
</body>
</html>