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Intent to ship: JPEG XL! This will be on-by-default in Firefox 157, which should become the main release version at the end of September. This includes key JPEG XL features like progressive rendering. groups.google.com/a/mozilla.or...

groups.google.comIntent to ship: JPEG XLAs of Firefox 157 I intend to turn JPEG XL decoding on by default on all platforms. It has been developed behind image.jxl.enabled, which today is on by default on Nightly only, and has had a Firefox…

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Woo! There's a lot to like about the format but the lossless recompression of existing jpegs is *such* a killer feature nothing else can remotely match.

Nice to see progressive rendering included. For CMSes like WordPress, the harder part will be delivery: content negotiation, cache keys, and fallbacks. A format win can disappear quickly if variant handling causes cache misses or doubles storage.

I'm thinking some combination of HTML property plus JS controls. Or at least a method for JS to check loading progress from the client end to feed back to the server so it knows when to start sending more.