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MediaKeySession: message event

The message event of the MediaKeySession interface fires when a message is generated by the content decryption module.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("message", (event) => {});

onmessage = (event) => {};

MediaKeyMessageEvent.message Read only: Returns an ArrayBuffer with a message from the content decryption module. Messages vary by key system.
MediaKeyMessageEvent.messageType Read only: Indicates the type of message. May be one of license-request, license-renewal, license-release, or individualization-request.

Specification
Encrypted Media Extensions # dom-mediakeysession-onmessage

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`message_event`	55 42–55 The `onmessage` event handler property is not supported.	79	52	No	42 29–42 The `onmessage` event handler property is not supported.	12.1	55 43–55 The `onmessage` event handler property is not supported.	55 42–55 The `onmessage` event handler property is not supported.	52	42 29–42 The `onmessage` event handler property is not supported.	12.2	6.0 4.0–6.0 The `onmessage` event handler property is not supported.

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https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySession/message_event