This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2019.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The closed read-only property of the MediaKeySession interface 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 Closing a session means that licenses and keys associated with it are no longer valid for decrypting media data.
A Promise.
| Specification |
|---|
| Encrypted Media Extensions> # dom-mediakeysession-closed> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
closed |
42 | 13 | 38 | 29 | 12.1 | 42 | 38 | 29 | 12.2 | 4.0 | 43 | 12.2 |
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https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySession/closed