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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if textarea 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 doTest()
{
var e = document.getElementById('t');
e.setCustomValidity('foo');
e.removeAttribute('disabled');
document.documentElement.className='';
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>
<body>
<textarea class='invalid' id='t' disabled></textarea>
</body>
</html>