This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The MediaKeySession.closed read-only property returns a Promise signaling when a MediaKeySession closes. This promise can only be fulfilled and is never rejected. Closing a session means that licenses and keys associated with it are no longer valid for decrypting media data.


var promise = mediaKeySessionObj.closed;


A Promise.


Specification Status Comment
Encrypted Media Extensions
The definition of 'closed' in that specification.
Recommendation Initial definition

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 42 (Yes) ? ? ? ?
Feature Android Webview Chrome for Android Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
Basic support 43 43 (Yes) ? ? ? ? ?

Document Tags and Contributors

 Contributors to this page: jpmedley, libbymc, Sebastianz, Calmbit
 Last updated by: jpmedley,