2.1.31 [W3C-HTML51] Section 22.214.171.124.1 Text track model
V0089: The change event is not fired when the text track mode changes
The specification states:
... Text track model ... Whenever a text track that is in a media element's list of text tracks has its text track mode change value, the user agent must run the following steps for the media element: ... 3. Queue a task that runs the following substeps: ... 2. Fire a simple event named change at the media element's textTracks attribute's TextTrackList object.
change event is not fired
when the text track mode changes.