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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if a button has is candidate for constraint validation then change
its type to be barred from constraint validation, it should not be
affected by :valid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body onload="document.getElementById('b').type='button'; document.documentElement.className='';">
<button class='notvalid' type='submit' id='b'></button>
</body>
</html>