Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
 The onwaitingforkey property of the HTMLMediaElement is an event handler, fired when a waitingforkey event occurs, when playback is blocked while waiting for an encryption key. 
This interface inherits from the ExtendableEvent interface.
HTMLMediaElement.onwaitingforkey = function(waitingforkey) { ... }
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onwaitingforkey | 
55  | 
79  | 
52  | 
No  | 
42  | 
12.1  | 
55  | 
55  | 
52  | 
42  | 
12.2  | 
6.0  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/onwaitingforkey