Currently, the website lists the javascript part of raku/rakudo as an normal part of the whole language, which leads to outside viewers assuming that it is maintained like the rest of raku/rakudo, while this is clearly not the case in the moment.
It therefore should be added a notice that usage of the javascript backend / rakudo.js is experimental. It might even be of benefit to move the javascript tab from the top of the downloads page to the bottom under a new section "Experimental".
Maybe it also should be discussed if it is to be marked as "unmaintained" as it seems that way as no-one seems to work on it currently, which might be of benefit for an outside viewer to decide if they want to evaluate using rakudo with javascript or not.