ElementInternals: ariaColCount property

Baseline 2023

Newly available

Since ⁨October 2023⁩, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

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

Note: Setting aria attributes on ElementInternals allows default semantics to be defined on a custom element. These may be overwritten by author-defined attributes, but ensure that default semantics are retained should the author delete those attributes, or fail to add them at all. For more information see the Accessibility Object Model explainer.

Value

A string.

Examples

In this example the aria-colcount attribute is set to "3".

class CustomControl extends HTMLElement {
  constructor() {
    super();
    this.internals_ = this.attachInternals();
    this.internals_.ariaColCount = "3";
  }
  // …
}