chromium/content/test/data/accessibility/html/textarea-changes.html

<!--
@WAIT-FOR:done
-->
<html>
<head>

  <style>
    @font-face {
      font-family: 'Ahem';
      src: local('Ahem'),
        url('../../font/Ahem.ttf');
    }
    .textarea-width {
      font-size: 50ch;
      font-family: "Ahem";
      letter-spacing: 1ch;
    }
  </style>
</head>
<body>
  <textarea class="textarea-width"></textarea>
</body>
<script>
document.addEventListener('DOMContentLoaded', () => {
  setTimeout(() => {
    const textarea = document.querySelector('textarea');
    textarea.role = 'textbox';
    textarea.innerText = 'xyz';
    const paragraph = document.createElement('p');
    paragraph.innerText ='abc';
    textarea.appendChild(paragraph);
    document.title = 'done';
  }, 150);
});
</script>

</body>
</html>