button-type-invalid.html

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<!DOCTYPE html>

<html class="reftest-wait">

  <!-- Test: if a button has a custom error when barred from constraint

             validation then move a type candidate for constraint validation,

             it should not be affected by :valid pseudo-class. -->

  <link rel='stylesheet' type='text/css' href='style.css'>

  <script>

    function onLoadHandler()

      var b = document.getElementById('b');

      b.setCustomValidity('foo');

      b.type = 'submit';

      document.documentElement.className='';

  </script>

  <body onload="onLoadHandler();">

    <button class='notvalid' type='button' id='b'></button>

  </body>

</html>