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> Sites like Imgur could start serving APNG images today

I think there'd be a problem when customers copy/paste an image from the site into another application that doesn't support APNG. Seems like a common use-case that would cause a lot of customer confusion.

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Happened to me with a webp (on another site). And of course it had a .png extension because that was the original URL. After finally figuring it out, I had to go back and visit with another browser to get the right format.

How is this worse than the "gifv" that Imgur introduced?

gifv isn't a new file format at all. It's simply an mp4 video with gifv as the extension.

Exactly--but you can't reliably copy and paste it into another unknowing application.

It's actually an page wrapper around a video element so the source of a gifv is an html page

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