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Test Info:
<!DOCTYPE html>
<html class='reftest-wait'>
<head>
<style>
fieldset:invalid { display: none; }
</style>
</head>
<script>
function onloadHandler()
{
document.getElementById('i').readOnly = false;
document.documentElement.className = '';
}
</script>
<body onload='onloadHandler();'>
<fieldset id="fieldset">
<input id='i' required readonly>
</fieldset>
</body>
</html>