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<!DOCTYPE html>
<!-- fieldset with one valid element and you dynamically add a barred constraint
validation element -->
<html>
<head>
<style>
fieldset:invalid { display:none }
</style>
<script>
function onLoadHandler()
{
document.getElementById("fieldset").appendChild(document.getElementById('i'));
document.documentElement.className='';
}
</script>
</head>
<body onload='onLoadHandler();'>
<input id='i' value='foo' readonly>
<fieldset id="fieldset">
<input required>
</fieldset>
</body>
</html>
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