While I get why, it bugs me that they have comparison images between jxl and other formats, yet it doesn't actually use jxl, as evidenced by all images displaying correctly on my chrome browser.
It uses jxl if the browser supports it, using <picture>¹.
¹ https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/...
It uses jxl if the browser supports it, using <picture>¹.
¹ https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/...