fieldset-nested-valid-invalid.html

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<!DOCTYPE html>

<!-- Nested fieldsets should be assigned validation correctly -->

<html>

  <head>

    <style>

      fieldset:valid { background-color: green; }

      fieldset:invalid { background-color: red; }

    </style>

  </head>

  <body>

    <fieldset>

      <fieldset>

        <input>

      </fieldset>

      <fieldset>

        <input required>

      </fieldset>

    </fieldset>

  </body>

</html>