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>
  <tbody role="rowgroup">
    <tr role="row">
      <td role="cell" aria-rowindex="11">header</td>
      <td role="cell" aria-rowindex="11">h1</td>
    <tr role="row">
      <td role="cell" aria-rowindex="16">header</td>
      <td role="cell" aria-rowindex="16">h6</td>
    <tr role="row">
      <td role="cell" aria-rowindex="18">rowgroup</td>
      <td role="cell" aria-rowindex="18">thead</td>
    <tr role="row">
      <td role="cell" aria-rowindex="24">term</td>
      <td role="cell" aria-rowindex="24">dt</td>
let el = document.getElementById('semantic-table');
console.log(el.ariaColCount); // 2
el.ariaColCount = "3"
console.log(el.ariaColCount); // 3


Accessible Rich Internet Applications (WAI-ARIA)
# dom-ariamixin-ariacolcount

Browser compatibility

BCD tables only load in the browser