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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/ariaColCount below:

Element: ariaColCount property - Web APIs

Baseline 2023

Newly available

The ariaColCount property of the Element interface reflects the value of the aria-colcount attribute, which defines the number of columns in a table, grid, or treegrid.

A string.

In this example the aria-colcount attribute on the element with an ID of semantic-table is set to "2". Using ariaColCount we update the value to "3".

<table
  id="semantic-table"
  role="table"
  aria-label="Semantic Elements"
  aria-describedby="semantic_elements_table_desc"
  aria-rowcount="100"
  aria-colcount="2">
  <caption id="semantic_elements_table_desc">
    Semantic Elements to use instead of ARIA's roles
  </caption>
  <thead role="rowgroup">
    <tr role="row">
      <th role="columnheader" aria-sort="none" aria-rowindex="1">ARIA Role</th>
      <th role="columnheader" aria-sort="none" aria-rowindex="1">
        Semantic Element
      </th>
    </tr>
  </thead>
  <tbody role="rowgroup">
    <tr role="row">
      <td role="cell" aria-rowindex="11">header</td>
      <td role="cell" aria-rowindex="11">h1</td>
    </tr>
    <tr role="row">
      <td role="cell" aria-rowindex="16">header</td>
      <td role="cell" aria-rowindex="16">h6</td>
    </tr>
    <tr role="row">
      <td role="cell" aria-rowindex="18">rowgroup</td>
      <td role="cell" aria-rowindex="18">thead</td>
    </tr>
    <tr role="row">
      <td role="cell" aria-rowindex="24">term</td>
      <td role="cell" aria-rowindex="24">dt</td>
    </tr>
  </tbody>
</table>

let el = document.getElementById("semantic-table");
console.log(el.ariaColCount); // 2
el.ariaColCount = "3";
console.log(el.ariaColCount); // 3

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