> > attribute be highlighted as a string?
>
> I'm not familiar with HEEx and can't share a useful opinion, but FWIW, I
> simply noted that the code directly above the change said
>
> :feature 'heex-string
>
> which is why I assumed that using a string face should make sense.

So we think that the current face is just a typo?

Originally I was not sure what would be more appropriate, but got a comment from a user and saw html-ts-mode uses string so thought it would be good to change before it gets released.