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"in theory, it does not matter, but MP4 is recommended and seems to be the most popular at the moment."

If I'm not mistaking, the <video> tag can't play MOV[0] so MP4 is the way to go.

[0] https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_...

Huh. That's kinda surprising, since MP4 containers are really just a standardized extension of QuickTime.

IIRC, it reads like they took the QuickTime spec, did a find-and-replace to change the word "atom" to "box," then added a couple of MPEG-specific enhancements.

Yeap. But technically, you can use WebM container (a subset of MKV) for AV1. Chrome and Firefox support it. But size is a little bigger and WebM container seems like is not really official for AV1.

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