On: JPEG XL: How it started, how it’s going

[jshier]

Oddly, Safari Tech Preview on Ventura advertises support for JXL but the images don't actually render. So the linked page has almost no images, just broken placeholders.

[markdog12 → jshier]

The image formats (at least newer ones) in Safari defer to OS support, so you'll need Sonoma to view JXL in Safari.

[jshier → markdog12]

Then you'd think STP wouldn't offer support for JXL. But it does, both to the site itself and in the release notes.

[malnourish → jshier]

The images shown to me are .avif (Firefox and Chrome on Windows)

[ComputerGuru → malnourish]

The header image I see is indeed an AVIF but it depends on what your browser sends in the `Accept` header. Chrome sends image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8 but if you drop image/avif from there you get a webp and if also drop image/webp from the header you finally end up with a jpeg.

However if you manually request that image with a custom `image/jxl` at the start of the `Accept:` header, you get a JPEG XL result. So GP is correct, but you won't see that behavior except on their PC (errr, Mac) -- unless you use Firefox and enable JPEGXL support in about:config, of course.

[jshier → ComputerGuru]

The STP request includes jxl.

image/webp,image/avif,image/jxl,image/heic,image/heic-sequence,video/;q=0.8,image/png,image/svg+xml,image/;q=0.8,/;q=0.5

[ComputerGuru → jshier]

Yeah, I was explaining how you could reproduce those results without being on the Safari preview.