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Test Info:
<!DOCTYPE html>
<html>
<!-- Test: if button is of the button type, it is barred from constraint
validation and should not be affected by :-moz-ui-valid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body>
<button class='notvalid' type='button'></button>
</body>
</html>