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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<link rel='stylesheet' type='text/css' href='style.css'>
<body onload="if (document.getElementById('i1').matches(':valid') ||
document.getElementById('i2').matches(':valid')) {
document.body.textContent='FAIL';
} else {
document.body.textContent='SUCCESS';
}
document.documentElement.className='';">
<input id='i1' name='foo' type='radio' required>
<input id='i2' name='foo' type='radio'>
</body>
</html>