WAI-ARIA: aria-colcount (Property)

Description

Defines the total number of columns in a table, grid, or treegrid. See related aria-colindex.

If all of the columns are present in the DOM, it is not necessary to set this attribute as the user agent can automatically calculate the total number of columns. However, if only a portion of the columns is present in the DOM at a given moment, this attribute is needed to provide an explicit indication of the number of columns in the full table.

Authors MUST set the value of aria-colcount to an integer equal to the number of columns in the full table. If the total number of columns is unknown, authors MUST set the value of aria-colcount to -1 to indicate that the value should not be calculated by the user agent.

Browser Compatibility For aria-colcount

	desktop						mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet
ariaColCount	ChromeFull support81	EdgeFull support81	FirefoxNo supportNo	Internet ExplorerNo supportNo	OperaFull support68	SafariFull support12.1	WebView AndroidFull support81	Chrome AndroidFull support81	Firefox for AndroidNo supportNo	Opera AndroidFull support58	Safari on iOSFull support12.2	Samsung InternetFull support13.0

Screen Reader support For aria-colcount

Expectation	JAWS			Narrator	NVDA			Orca	TalkBack	VoiceOver (iOS)	VoiceOver (macOS)
	Chrome	Edge	Firefox	Edge	Chrome	Edge	Firefox	Firefox	Chrome	Safari	Safari
MUST convey the total column count when some columns are hidden	supported	supported	supported	supported	supported	supported	supported	unknown	none	none	none
MUST NOT convey a column count when total column count is unknown	none	none	none	none	none	none	none	unknown	none	none	none

aria-colcount Example

The following example shows a grid with 16 columns, of which columns 2, 3, 4, and 9 are displayed to the user.

<div role="grid" aria-colcount="16">
  <div role="rowgroup">
    <div role="row">
      <span role="columnheader" aria-colindex="2">First Name</span> <span role="columnheader" aria-colindex="3">Last Name</span> <span role="columnheader" aria-colindex="4">Company</span> <span role="columnheader" aria-colindex="9">Phone</span>
    </div>
  </div>
  <div role="rowgroup">
    <div role="row">
      <span role="gridcell" aria-colindex="2">Fred</span> <span role="gridcell" aria-colindex="3">Jackson</span> <span role="gridcell" aria-colindex="4">Acme, Inc.</span> <span role="gridcell" aria-colindex="9">555-1234</span>
    </div>
    <div role="row">
      <span role="gridcell" aria-colindex="2">Sara</span> <span role="gridcell" aria-colindex="3">James</span> <span role="gridcell" aria-colindex="4">Acme, Inc.</span> <span role="gridcell" aria-colindex="9">555-1235</span>
    </div>…
  </div>
</div>

Characteristics

Used in Roles

• table

Inherits into Roles

• grid
• treegrid

Value

• integer
  • A numerical value without a fractional component.

Semantic HTML

No HTML element equivalent.

Reference

• W3C (opens new window)
• A11Y Support
• MDN Web Docs