And that's precisely the reason it was removed from the specs. There are so many moving things that need to be done right and in the end it all hinges on the me

And that's precisely the reason it was removed from the specs. There are so many moving things that need to be done right and in the end it all hinges on the media authoring being done right (which is why the HLS/DASH specs are valuable). I went over some of these things a few months ago: https://github.com/filamentgroup/html-video-responsive/issues https://github.com/filamentgroup/html-video-responsive/issue...