I wonder how to draw frames around various elements in LaTeX (or LuaLaTeX if needed)?
I would like to get frames around every text paragraph, and/or every equation, every image, every header, every footer and so on. The frame should identify the bounding box of the object. What is the best way to achieve this?
I am looking at hooks like
\everyvbox but I am asking here in case someone had a very clever way to achieve this task.