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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if input is readonly, it is barred from constraint validation
and should not be affected by :-moz-ui-invalid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body onload="document.getElementById('i').readOnly='ro'; document.documentElement.className='';">
<input class='notinvalid' id='i' required>
</body>
</html>