browser quirk mode
I was doing a forum post to help out a friend, and I came across some updated info on toggling quirk mode in various browsers, an issue I've ranted about here previously.
Here's a few links on the topic:
It seems Mozilla and Opera have similar mechanisms as well for controlling this now.
Another excellent resource for helping understand what the heck is going on can be found here: http://gutfeldt.ch/matthias/articles/doctypeswitch.html