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Test Info:
<!DOCTYPE html>
<html>
<!-- Test: if input is invalid but it's value hasn't changed, it's not
affected by :-moz-ui-invalid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body>
<fieldset disabled>
<legend>
<input class='notinvalid' required>
</legend>
</fieldset>
</body>
</html>