This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The MediaKeySession.expiration read-only property returns the time after which the keys in the current session can no longer be used to decrypt media data, or NaN if no such time exists. This value is determined by the CDM and measured in milliseconds since January 1, 1970, UTC. This value may change during a session lifetime, such as when an action triggers the start of a window.
var expirationTime = mediaKeySessionObj.expiration;
| Specification | Status | Comment |
|---|---|---|
| Encrypted Media Extensions The definition of 'expiration' in that specification. | Recommendation | Initial definition |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 42 | 13 | ? | ? | Yes | ? |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | 43 | 42 | Yes | ? | Yes | ? | 4.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySession/expiration