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Re:Evolution of <img>: Gif without the GIF by roh0sun on Tuesday December 05, 2017 @10:42AM (#15852373)
It’s just HEIF. http://nokiatech.github.io/heif/technical.html

I think we should not deny its future proving goodnees.

Re:Evolution of <img>: Gif without the GIF by cflat on Tuesday December 05, 2017 @01:39PM (#15854354)
mp4s aren't HEIF. but this feature is certainly pre-lude to Safari supporting HEIF in the browser.