This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The MediaKeySystemConfiguration.audioCapabilities read-only property returns an array of supported audio type and capability pairs.
var audioCapabilities[ {contentType: 'contentType', robustness:'robustness'}] = mediaSystemConfiguration.audioCapabilities; | Specification | Status | Comment | 
|---|---|---|
| Encrypted Media Extensions The definition of 'audioCapabilities' in that specification.  |  Recommendation | Initial definition | 
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 42 | ? | ? | ? | ? | ? | 
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | 43 | 42 | ? | ? | ? | ? | 4.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySystemConfiguration/audioCapabilities