>
      <button id="target-size-1">+</button>
      <span role="button" tabindex="0" id="target-size-2">o</span>
    </section>
    <p>td-has-header</p>
    <section>
      <table id="td-has-header">
        <tr><th>FOO</th><th>FOO</th><th>FOO</th><td>FOO</td></tr>
        <tr><td>foo</td><td>foo</td><td>foo</td><td>foo</td></tr>
        <tr><td>foo</td><td>foo</td><td>foo</td><td>foo</td></tr>
        <tr><td>foo</td><td>foo</td><td>foo</td><td>foo</td></tr>
      </table>
    </section>
    <p>td-headers-