ProPhoto RGB is not tested

[foolip]

This is part of the testing roadmap and the only remaining wide gamut test.

[FooIbar]

Note wide-gamut-display-p3.html and wide-gamut-rec2020.html are just placeholders, and sunset_logo.jxl in wide-gamut-adobe-rgb.html is a sRGB (instead of Adobe RGB) image, so this isn't the only one left.

[stof]

Does this mean that the score reported in web-platform-tests/interop#1293 is incorrect ?

[FooIbar]

Does this mean that the score reported in web-platform-tests/interop#1293 is incorrect ?

That is incorrect, but it's not due to this as wide gamut is excluded from the score.
It's because lossy modular isn't tested (will be fixed by web-platform-tests/wpt#60853).