The same thing stood out to me. With the popularity of animated GIFs, it's disappointing and ridiculous for a new Web-friendly image format to omit at least a s

The same thing stood out to me. With the popularity of animated GIFs, it's disappointing and ridiculous for a new Web-friendly image format to omit at least a simple multi-image/looping facility. As for your question about video looping: Nothing prevents that, although I don't know of a container format that has a flag to indicate that it should be looped. Players could eliminate the delay on looping by caching the first few frames.