[Webkit-unassigned] [Bug 206344] New: Unexpected TextTrackCue enter and exit events

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206344

            Bug ID: 206344
           Summary: Unexpected TextTrackCue enter and exit events
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chris.needham at bbc.co.uk

I have encountered a couple of issues with TextTrackCue enter and exit events in Safari:

- an enter event is fired if an active cue's startTime or endTime is changed
- an exit event is not fired if an active cue's startTime or endTime is changed such that it becomes no longer active.

I have documented the details of the tests I've done here: https://docs.google.com/document/d/1uq-wVjY3Lq6J3GLZb246-5smIjECxjZ4VqsY-gnIPek/edit

There's a demo page you can use to adjust cue start and end times interactively here: https://waveform.prototyping.bbc.co.uk/cue-events

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