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Test Info:

<!DOCTYPE html>
<!-- fieldset with one invalid element and a barred for constraint
validation element then you remove the second element -->
<html class='reftest-wait'>
<head>
<style>
fieldset:valid { display: none; }
</style>
</head>
<script>
function onloadHandler()
{
document.getElementById("fieldset").removeChild(document.getElementById('j'));
document.documentElement.className = '';
}
</script>
<body onload='onloadHandler();'>
<fieldset id="fieldset">
<input id='j' required>
<input value='foo' readonly>
</fieldset>
</body>
</html>