社区老民警马长林：受爱戴的好片警是怎样炼成的
Baseline Widely available
百度 除了海坨滑雪队，延庆引入2名专业滑冰滑雪教练、12名高层次人才、17名博士后，组建青少年冰雪轮滑队，注册冬季项目运动员145人。
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Closing a session means that licenses and keys associated with it are no longer valid for decrypting media data.
Value
A Promise.
Specifications
| Specification |
|---|
| Encrypted Media Extensions # dom-mediakeysession-closed |