gecko/layout/reftests/css-invalid/textarea/textarea-required-invalid.html

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HTML

<!DOCTYPE html>
<html>
<!-- Test: if textarea isn't valid nor barred from constraint validation,
it should be affected by :invalid pseudo-class. -->
<style>
textarea { background-color: red; }
textarea:invalid { background-color: green; }
</style>
<body>
<textarea required></textarea>
</body>
</html>