---
title: ElementInternals.ariaColCount
slug: Web/API/ElementInternals/ariaColCount
tags:
  - API
  - Property
  - Reference
  - ariaColCount
  - AriaAttributes
  - AriaMixin
  - ElementInternals
browser-compat: api.ElementInternals.ariaColCount
---
{{DefaultAPISidebar("DOM")}}

The **`ariaColCount`** property of the {{domxref("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](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).

## Syntax

```js
let ariaColCount = ElementInternals.ariaColCount;
ElementInternals.ariaColCount = ariaColCount;
```

### Value

A {{domxref("DOMString")}}.

## Examples

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

```js
this.internals_.ariaColCount = "3";
```

## Specifications

{{Specifications}}

## Browser compatibility

{{Compat}}

- [ARIA: table role](/en-US/docs/Web/Accessibility/ARIA/Roles/Table_Role)
