In maintaining pages created by others long gone, I sometimes come across constructs that I've never seen before. Usually these are the result of macros I've never had occasion to use. I have such a page before me.
I'm sure there's some trivial way to identify the macros being used on a page, but I don't know what it is.
(The specific case here is that, when I open the page for editing, the page seems to consist of invisible boxes, two columns. I can edit inside the boxes but not select the boxes. But I'm interested in some general answer so I can delay having to ask for help.)
John