Web video was "fixed" in the dying years of Flash. I remember cursing on HMTL5 video, but it was suddenly got performing really well and switched YouTube to it and never looked back. Just pick a graphics library and you'll be fine if you want to move vector stuff around. If you miss the flash IDE, then it still exists and can export to HTML5 standards.
Being proprietary was just part of the problem. I'm glad it showed us the way but it needed to be gone.