chromium/content/test/data/accessibility/html/table-with-pseudo-elements.html

<!doctype HTML>
<style>
  :before {
    content: "before";
  }
  :after {
    content: "after";
  }
</style>
<table>
  <tr>
    <td><input type="text"></td>
    <td><input type="submit"></td>
  </tr>
</table>