Sublime

I like to think of it it with the question: what is to reading what a text-editor is to typing? Social features for sure. We could also experiment with crazy stuff like SYNTACTIC SPACING. Here's an illustration on a paragraph from Doug Englebart's Augmenting Human Intellect:

⌘K

⌘K is a command menu React component that can also be used as an accessible combobox. You render items, it filters and sorts them automatically. ⌘K supports a fully composable API How?, so you can wrap items in other components or even as static JSX.

Demo and examples: cmdk.paco.me