> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/llms.txt)
# Display icons above 3D buildings
This example uses a `symbol-z-elevate` property to display a symbol layer above fill extrusions and models.
> **Note: Performance caveats of the property**
>
> To have minimal impact on performance, this is supported only when `fill-extrusion-height` is not zoom-dependent and remains unchanged. For more details about `symbol-z-elevate` follow [the link](https://docs.mapbox.com/style-spec/reference/layers/#layout-symbol-symbol-z-elevate).
> **Note (warning): Supported File Types**
>
> Only `.png`, `.jpg` and `.webp` formats are supported when loading images into a style at runtime using [`map.loadImage()`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#loadimage). Other file types like `.svg` are not supported.
> Example code:
**JavaScript**
```html
Display icons above 3D buildings
```
**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',
center: [-74.010499, 40.705441],
zoom: 15.1,
pitch: 60
});
mapRef.current.once('style.load', () => {
mapRef.current.setConfigProperty(
'basemap',
'showPointOfInterestLabels',
false
);
mapRef.current.setConfigProperty('basemap', 'showPlaceLabels', false);
mapRef.current.setConfigProperty('basemap', 'showRoadLabels', false);
mapRef.current.setConfigProperty('basemap', 'showTransitLabels', false);
});
mapRef.current.once('load', () => {
mapRef.current.loadImage(
'https://docs.mapbox.com/mapbox-gl-js/assets/cat.png',
(error, image) => {
mapRef.current.addImage('cat', image);
mapRef.current.addSource('buildings', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-74.00923587095748, 40.70294276920271]
}
}
]
}
});
mapRef.current.addLayer({
id: 'cat-on-building',
source: 'buildings',
slot: 'top',
type: 'symbol',
layout: {
'icon-image': 'cat',
'icon-size': 0.1,
'symbol-placement': 'point',
'symbol-z-elevate': true
}
});
}
);
});
}, []);
return ;
};
export default MapboxExample;
```