x solid blue;
  }
  fieldset {
    margin: 0;
    padding: 0;
    border: 0;
  }
  </style>

  <body>
    <article class="column">
      <div>block1</div>
      <table class="spanner">
        <tr>
          <td>table as a spanner</td>
        </tr>
      </table>
      <div>block2</div>
    </article>
    <br>

    <article class="column">
      <div>block1</div>
      <div class="spanner" style="display: grid;">grid as a spanner</div>
      <div>block2</div>
    </article>
    <br>

    <article class="co