In all seriousness we make sure things work with modern browsers, but you're never going to find a government agency requiring the latest and most advanced tech. For one thing, nothing in government moves fast enough to make that even remotely possible.
Also there's no way I'm gonna learn how to use some new piece of tech every few months. They don't pay us nearly enough for that kind of effort.
EDIT: Oh but I wasn't kidding about dropping support for IE6 recently. It was like a year or so ago, not last week, but still.