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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if input is no longer readonly, it is candidate for constraint
validation and should be affected by :valid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body onload="document.getElementById('i').removeAttribute('readonly'); document.documentElement.className='';">
<input class='valid' id='i' readonly>
</body>
</html>