<!DOCTYPE html>
<html>
<!-- Test: if input has a disabled fieldset ancestor, but is in the first
legend, it is not barred from constraint validation and should be
affected by :-moz-ui-valid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body>
<fieldset disabled>
<legend>
<input class='notvalid'></input>
</legend>
</fieldset>
</body>
</html>