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<!DOCTYPE html>
<!-- fieldset with one invalid element and a barred for constraint validation element -->
<html>
<head>
<style>
fieldset:valid { display: none; }
</style>
</head>
<body>
<fieldset id="fieldset">
<input id='i' value='bar' required>
<input id='i' value='foo' readonly required>
</fieldset>
</body>
</html>
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