Hi Ian, I think there's a typo in the description of the TimedTrack mode at http://www.whatwg.org/specs/web-apps/current-work/complete/video.html#timed-track-mode. It says:
Hidden Indicates that the timed track is active, but that the user agent is not actively displaying the cues. If no attempt has yet been made to obtain the track's cues, the user will perform such an attempt momentarily. The user agent is maintaining a list of which cues are active, and events are being fired accordingly. But I think it should be "the user *agent* will perform such an attempt momentarily." Cheers, Silvia.
