2.1.6 [MS-EME] Section 7. HTMLMediaElement Extensions

V0006: The onwaitingforkey event is not supported

The specification states:

 7. HTMLMediaElement Extensions
  
 This section specifies additions to and modifications of the HTMLMediaElement [HTML51] 
 when the Encrypted Media Extensions are supported.
 ...
 WebIDL
  
     partial interface HTMLMediaElement {
         [SecureContext]
         readonly attribute MediaKeys?   mediaKeys;
                 ...
                 attribute EventHandler onwaitingforkey;
         ...
     };

EdgeHTML Mode

The onwaitingforkey event is not supported.