[githubalphapapa]

> Web tech gives you a greater degree of control: e.g., Emacs Lisp cannot put red sqiggles under text like VSCode does, but rather limits the user interface essentially to one large "textarea" (though in contrast to TTY interfaces, Emacs has good support for the mouse), but it is very rare for me to want web tech's greater degree of control.

Emacs can certainly apply red squiggles and many other rich text formatting, through the use of faces (which is how all syntax highlighting is implemented). Emacs also has a rich text-properties API through which any part of a buffer's text may be propertized with metadata. And it also provides overlays, which "overlay" text, also optionally with additional properties, without modifying the buffer text itself.

Together, these features are used to implement GUIs such as the Customization system with widgets, buttons, clickable links, collapsible sections, etc., as well as red-squiggle-style linting tools like flymake, flycheck, and LSP-related tools.

[hollerith]

Do you have a screenshot or a sexpr I can eval to produce the red squiggles in my Emacs?

[githubalphapapa]

> as well as red-squiggle-style linting tools like flymake, flycheck, and LSP-related tools.

[hollerith]

Thanks. I now know how to make red squiggles in my Emacs.