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Test Info:
<!DOCTYPE html>
<html>
<!-- Test: if input isn't valid nor barred from constraint validation,
but its default value hasn't been changed,
it should not be affected by :-moz-ui-invalid pseudo-class. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body>
<input class='notinvalid' type='file' required>
</body>
</html>