When I first wrote about what's known as the Clearfix technique in 2004, I knew it was going to be useful. It was to solve a problem that previously required us to add extra markup to the page. I had no idea it would still be used in one of it's many forms in most CMS and a large percentage of all websites 8 years later.
Browsers have come a long way since then, most of the browser versions we had to support are not even thought of these days.