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You can use AV1 or HEIF right now, and they're actually modern formats.

> Even 4:2:0 is better than the sRGB usually used in PNG.

Better for what? Not for wide-color photographs or any kind of colored text, that's for sure.

Afaik there is no av1 or heif browser implementations. Theres far less efficient polyfills for heif that are poor on large images.

Chrome 70 Canary and Firefox Nightly support AV1. YouTube has a test channel with AV1 encoded videos.

https://9to5google.com/2018/09/14/youtube-av1-video-beta-chr...

That is very, very new, and afaik it uses the poorly performing reference Implimentation.

HEIF works in Safari, and I believe Android will have it soon if it doesn't already. As for AV1, browsers can add it anytime they want…

Looking at CanIUse [1][2], it seems like the HEIF support is in macOS itself, and not the Safari browser. I wouldn't be surprised if the Windows version of Safari didn't support it.

[1] https://caniuse.com/#feat=heif

[2] https://github.com/Fyrd/caniuse/issues/3767

Safari for Windows has been discontinued a few years back.

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