fieldset-valid-and-barred.html

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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>