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Test Info:
<!DOCTYPE html>
<html>
<!-- Test: if textarea has a disabled fieldset ancestor, it is barred from
constraint validation and should not be affected by :-moz-ui-invalid
pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body>
<fieldset disabled>
<fieldset>
<textarea class='notinvalid' required></textarea>
</fieldset>
</fieldset>
</body>
</html>