The ariaRowSpan property of the Element interface reflects the value of the aria-rowspan attribute, which defines the number of rows spanned by a cell or gridcell within a table, grid, or treegrid.

A string which contains an integer.

In this example the aria-rowspan attribute on the element with an ID of spanning-heading is set to "3". Using ariaRowSpan we update the value to "2".

<table>
  <tr>
    <th id="spanning-heading" rowspan="3" aria-rowspan="3">Spanning heading</th>
    <th>Heading</th>
  </tr>
  <tr>
    <td>One</td>
  </tr>
  <tr>
    <td>Two</td>
  </tr>
</table>

let el = document.getElementById("spanning-heading");
console.log(el.ariaRowSpan);
el.ariaRowSpan = "2";
console.log(el.ariaRowSpan);

• ARIA: table role