Inline small tooltip with small colorful icon in specification for IDEs.

[YagaoDirac]

I just spent 10-ish minutes watched the first 40 minutes of
https://www.youtube.com/watch?v=NiferfBvN3s
The host introduces some feature of asp. This reminds me of the new inline tooltip feature came with vs2022. It looks like:

I suggest add this to the specification since you mentioned the specification will be also for a lot of relevant infrastructures.

Reason:
Readability.

Edit:
Maybe I should have started like, "don't rely on text-only design to obtain great readability".
I've no idea about APL. The only knowledge is from the video. Symbols are generally more readability than characters but super hard for people to search. Symbols always have different names around the world, and never have any precise translation in other natural languages.
But till now, not IDEs provide only semantic coloring. This is not very enough. I've no idea how to improve this but it's needed.
If this is the case, maybe you can rely on shorter keywords, shorter names while maintain readability. Especially, borders are perfect to enhance semantic coloring. But if this is not in the specification, idk, at least programmers can't rely on this and optimize their tricks.