2.1.45 [HTML5:2014] Section 4.7.10.12.7 Event definitions

V0112: These TextTrackList, TextTrack, and TextTrackCue event handlers are not supported

The specification states:

 4.7.10.12.7 Event definitions
  
     The following are the event handlers that (and their corresponding event handler 
     event types) must be supported, as event handler IDL attributes, by all objects 
     implementing the TextTrackList interface:
  
         Event handler | Event handler event type 
         ---------------------------------------
         onchange      | change  
         onaddtrack    | addtrack  
         onremovetrack | removetrack  
  
     The following are the event handlers that (and their corresponding event handler 
     event types) must be supported, as event handler IDL attributes, by all objects 
     implementing the TextTrack interface:
  
         Event handler | Event handler event type 
         ---------------------------------------
         oncuechange   | cuechange  
  
     The following are the event handlers that (and their corresponding event handler 
     event types) must be supported, as event handler IDL attributes, by all objects 
     implementing the TextTrackCue interface:
  
         Event handler | Event handler event type 
         ---------------------------------------
         onenter       | enter  
         onexit        | exit

IE9 Mode, IE8 Mode, IE7 Mode, and IE5 (Quirks) Mode (All versions)

These TextTrackList, TextTrack, and TextTrackCue event handlers are not supported.

V0113: The onaddtrack event handler is not supported

The specification states:

 4.7.10.12.7 Event definitions
  
     The following are the event handlers that (and their corresponding event handler 
     event types) must be supported, as event handler IDL attributes, by all objects 
     implementing the TextTrackList interface:
  
         Event handler | Event handler event type 
         ---------------------------------------
         onchange      | change  
         onaddtrack    | addtrack  
         onremovetrack | removetrack

IE10 Mode, IE9 Mode, IE8 Mode, IE7 Mode, and IE5 (Quirks) Mode (All versions)

The onaddtrack event handler is not supported.