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by Dylan16807 4695 days ago
You can already do things like that with gamma. To say nothing of embeds allowing file substitution.

I don't see why fallback is bad. Having a single canonical file is so much nicer than multiple files. APNG has been around for ages. If you as an upload-accepting web dev aren't aware of it you're not a very good web dev. And as a user you don't even know what container an image is using 99% of the time, so MIME type doesn't matter. Browsers tend to ignore image MIME anyway because of how common mislabelings are.