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Test Info:

<!DOCTYPE html>
<html>
<!-- Test: if select is required, has all selected option value set to the
empty string, and the selection did not changed,
:-moz-ui-invalid should not apply. -->
<link rel='stylesheet' type='text/css' href='style.css'>
<body>
<select class='notinvalid' required multiple>
<option selected></option>
<option selected value="">foo</option>
</select>
</body>
</html>