MediaKeySession.onkeystatuseschange - Web APIs
this interface inherits from the extendableevent interface. ...
...} specifications specification status comment encrypted media extensionsthe definition of 'onkeystatuseschange' in that specification. recommendation initial definition. ...

Index - Web APIs
nly 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 closing a session means that licenses and keys associated with it are no longer valid for decrypting media data. 2334 mediakeysession.onkeystatuseschange the onkeystatuseschange property of the mediakeysession is an event handler, fired whenever a keystatuschange event ocurrs, denoting there has been a change in the keys or their statuses within a session. 2335 mediakeysession.onmessage the onmessage property of the mediakeysession is an event handler, fired whenever a mediakeymessageevent occurs, denoting a message is generated by the content decryption module. 2336 close() api, encryptedmediaextensions, experimental,...