---
description: API reference for rtk-controlbar-button component (Web Components (HTML) Library)
title: rtk-controlbar-button
image: https://developers.cloudflare.com/og-docs.png
---

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# rtk-controlbar-button

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://e8aee267.previews.developers.cloudflare.com/realtime/realtimekit/ui-kit/api-reference/core/rtk-controlbar-button/index.md)|[Agent setup](https://e8aee267.previews.developers.cloudflare.com/agent-setup/)

A skeleton component used for composing custom controlbar buttons.

## Properties

| Property    | Type               | Required | Default         | Description                                                    |
| ----------- | ------------------ | -------- | --------------- | -------------------------------------------------------------- |
| brandIcon   | boolean            | ✅        | \-              | Whether icon requires brand color                              |
| disabled    | boolean            | ✅        | \-              | Whether button is disabled                                     |
| icon        | string             | ✅        | \-              | Icon                                                           |
| iconPack    | IconPack           | ❌        | defaultIconPack | Icon pack                                                      |
| isLoading   | boolean            | ✅        | \-              | Loading state Ignores current icon and shows a spinner if true |
| label       | string             | ✅        | \-              | Label of button                                                |
| showWarning | boolean            | ✅        | \-              | Whether to show warning icon                                   |
| size        | Size               | ✅        | \-              | Size                                                           |
| variant     | ControlBarVariant1 | ✅        | \-              | Variant                                                        |

## Usage Examples

### Basic Usage

```html
<rtk-controlbar-button></rtk-controlbar-button>
```

### With Properties

```html
<rtk-controlbar-button
 icon="example">
</rtk-controlbar-button>
```

```html
<script>
  const el = document.querySelector("rtk-controlbar-button");

  el.brandIcon= true;
  el.disabled= true;
</script>
```

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