Should features not ready for implementation be tested?

[SebastianZ]

There are several specifications that are marked as "Not ready for implementation" like CSS Color 6 or CSS Backgrounds 4. And there are also individual features within different specs that are marked as at-risk like e.g. font-language-override in CSS Fonts 4, the scroll value of spatial-navigation-action in CSS Spatial Navigation 1 or the :blank pseudo-class of Selectors 4.

Currently, we have mixed coverage of those features and specs. Should we cover all of them, should we remove them, or should we mark them as "highly experimental" somehow?

I'd initially remove them if there are no implementations yet. In a second step I'd add them back with a hint that they are highly experimental and exclude them from the score. And maybe a new filter could be added to cover them.

Sebastian