There have been a few other test pages posted in the comments with varying degrees of additional context. https://jpegxl.info/resources/jpeg-xl-test-page https

There have been a few other test pages posted in the comments with varying degrees of additional context. https://jpegxl.info/resources/jpeg-xl-test-page https://jpegxl.info/resources/jpeg-xl-test-page https://caniuse.com/jpegxl https://caniuse.com/jpegxl