# Dolby Atmos
**Checking support…**
Tip: open your browser's developer console and use the `player` and `THEOplayer` variables to interact with this demo.
**Source**
DASHHLS
This example plays a Dolby Atmos (ec-3, 16/JOC) stream and probes the browser for Atmos support with [`MediaCapabilities.decodingInfo`](https://developer.mozilla.org/en-US/docs/Web/API/Media_Capabilities_API): once for plain Dolby Digital Plus decoding, and once with `spatialRendering: true` for Atmos. When `navigator.mediaCapabilities` is unavailable it falls back to `MediaSource.isTypeSupported`.
```js
await navigator.mediaCapabilities.decodingInfo({
type: 'media-source',
audio: {
contentType: 'audio/mp4; codecs="ec-3"',
channels: '16',
bitrate: 768000,
samplerate: 48000,
spatialRendering: true,
},
});
```
The status box above the player is green when both checks pass, yellow when the stream plays but without Atmos spatial rendering, and red when the browser cannot decode ec-3 at all.
> **Note**
>
> Browsers cannot report whether the connected speakers or headphones are Atmos-capable — the check only covers decoding, not the output device.
Code
demo.html
```html
Dolby Atmos
```