I must be one of the only people using the css-tricks solution of group?

https://css-tricks.com/snippets/css/clear-fix/
[See update for august 2012.]

The main downside i can see for display:flow-root is that of backwards compatibility. Maybe in 3 years or so when it becomes actually embedded into the spec, it will need to have a fall back of some sort, and a simple
.group:after {
content: “”;
display: table;
clear: both;
}
works perfectly fine for the time being 🙂