Baseline Widely available
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The expiration read-only property of the MediaKeySession interface returns the time after which the keys in the current session can no longer be used to decrypt media data, or NaN if no such time exists.
This value is determined by the CDM and measured in milliseconds since January 1, 1970, UTC. This value may change during a session lifetime, such as when an action triggers the start of a window.
ValueA number or NaN.
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4