> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/ja/llms.txt)
# Add a fullscreen control to a map
This example adds a clickable map control that enables a user to toggle fullscreen mode on and off.
It uses [`addControl`](https://docs.mapbox.com/mapbox-gl-js/ja/api/map/#map#addcontrol) with [`FullscreenControl`](https://docs.mapbox.com/mapbox-gl-js/ja/api/markers/#fullscreencontrol) to add the button overlay on the map. The control will hide itself if used in a browser that does not support [`requestFullScreen()`](https://developer.mozilla.org/en-US/docs/Web/API/Element/requestFullScreen#browser_compatibility).
> Example code:
**JavaScript**
```html
Add a fullscreen control to a map
```
**React**
```jsx
import React, { useEffect, useRef } from 'react';
import * as mapboxgl from 'mapbox-gl/esm';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
useEffect(() => {
mapRef.current = new mapboxgl.Map({
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/standard', // style URL
center: [11.255, 43.77],
zoom: 13
});
mapRef.current.addControl(new mapboxgl.FullscreenControl());
return () => {
mapRef.current.remove();
};
}, []);
return ;
};
export default MapboxExample;
```