When, in the course of human events, it becomes necessary to understand why your wordpress site's freaking menus display fine when you're logged in as administrator but are completely broken when you're logged out, it may be useful to be able to easily compile all the CSS for the affected page elements for both the working and nonworking versions, and compare them to see what might be different.

Let me back up. I had a problem the other day where my Wordpress site's caching plugin, which performs various optimizations on my site's code for non-logged-in users, was adding some sort of broken CSS. When I was logged in, everything worked fine, but when not logged in, something changed somewhere in the CSS that caused some of my menus not to display. I had a rough idea of where the changed code must be, but no more than that, and…