> Nobody is going to adopt something without being natively supported by browsers without ugly js hacks That's fair, but it is worth pointing out that <picture

> Nobody is going to adopt something without being natively supported by browsers without ugly js hacks That's fair, but it is worth pointing out that <picture> tags support multiple source formats. I serve some logos and other important images as both .png and .webp. Adding additional lines for avif for jxl seem reasonable - especially if browsers are testing new formats.