I noticed that there isn't (as far as I'm aware) any syntax highlighting for VimL as of now.
Now that Google prettify is replaced with highlight.js, wouldn't it be possible to have one now?
Very disappointingly for us, although part of the rationale for changing from Prettify to highlight.js was that with Prettify "no new language syntaxes are being supported", the current change does not add highlighting for Vimscript or any other "new" languages.
Worse than that, if these moderator comments are to believed, it sounds as though SE intends to be conservative about adding new languages in the future (emphasis mine):
I hate to be the bearer of bad news, but this update has not added any new language support (officially. Technically sublanguages like Less/scss got snuck in with the css support). […] That being said, adding more languages to our bundle is technically trivial, but we need to be mindful of bloating the deliverable size. I'll keep this suggestion in mind once we revisit and decide whether to add additional language support. — Ben Kelly
In theory, yes. That being said, I've not looking into the possibilities there or how it would impact us (from a bandwidth/hosting perspective) or our users (from a UX/performance perspective). This is definitely something we'll keep in mind if we decide to expand our supported languages in the future. — Ben Kelly