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Test Info:
<!DOCTYPE html>
<!-- fieldset with invalid barred for constraint validation element -->
<html>
<head>
<style>
fieldset:valid { display: none ;}
</style>
<script>
function onloadHandler()
{
document.getElementById("fieldset").appendChild(document.getElementById('i'));
document.documentElement.className = '';
}
</script>
</head>
<body onload="onloadHandler();">
<input required readonly id="i">
<fieldset id="fieldset">
</fieldset>
</body>
</html>