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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if button is not disabled and invalid, it is candidate for
constraint validation and should be affected
by :invalid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<script>
function onLoadHandler()
{
var e = document.getElementById('b');
e.setCustomValidity('foo');
e.removeAttribute('disabled');
document.documentElement.className='';
}
</script>
<body onload="onLoadHandler();">
<button class='invalid' id='b' disabled></button>
</body>
</html>