The MediaKeys.createSession() method returns a new MediaKeySession object, which represents a context for message exchange with a content decryption module (CDM). 
 The MediaKeys.createSession() method returns a new MediaKeySession object, which represents a context for message exchange with a content decryption module (CDM). 
js
createSession() createSession(mediaKeySessionType)
mediaKeySessionType Optional
A string. Either "temporary" or "persistent-license". The default value is "temporary".
A new MediaKeySession object.
| Specification | 
|---|
| Encrypted Media Extensions  # dom-mediakeys-createsession  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
createSession | 
42 | 13 | 38 | No | 29 | 12.1 | 43 | 42 | 38 | 29 | 12.2 | 4.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/MediaKeys/createSession