HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaColSpan read</title>
</head>
<body>
  <table>
    <thead><tr><th>Heading 1</th><th>Heading 2</th><th>Heading 3</th></tr></thead>
    <tbody>
      <tr>
        <td colspan="2" aria-colspan="2" id="spanning-column">Spanning</td>
        <td>One</td>
      </tr>
    </tbody>
  </table>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      String(document.getElementById("spanning-column").ariaColSpan);
  </script>
</body>
</html>

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Element.ariaColSpan — read (Try It)