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> Some websites use looping videos and call them GIFs

That’s exactly what they’re doing. Just used the web inspector on one of their GIFs. Imgur does the same thing.

Not from here. Here's one I got from their front page. https://j.gifs.com/qjOKXp.gif

The content-type response header is image/gif.

Interestingly you can change the `.gif` to `.mp4` and you get a video _with_ audio.