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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if a button has a custom error when barred from constraint
validation then move a type candidate for constraint validation,
it should not be affected by :invalid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<script>
function onLoadHandler()
{
var b = document.getElementById('b');
b.setCustomValidity('foo');
b.type = 'submit';
document.documentElement.className='';
}
</script>
<body onload="onLoadHandler();">
<button class='invalid' type='button' id='b'></button>
</body>
</html>