The worst part for me is that it's one of the few places I end up having to hack my hacks because I find out that Firefox does something wildly different from C

The worst part for me is that it's one of the few places I end up having to hack my hacks because I find out that Firefox does something wildly different from Chrome so the fix I just made to Firefox made it better but broke something else. It feels just as annoying and opaque now as when I was doing CSS hacks for Netscape navigator vs IE. The other thing that frustrated me about CSS and continues to this day is the lack of permanence of a working layout. That is one of the things that really separates the backend from the front end mindset for me, the back end can be done forever but the front end will have to change to fix something unknown in the future