William Keely7,295 Points
Overflow part was very unclear.
Why did he bring up the overflow part and then not explain how exactly it was solving the problem? He seemed to just say, "this overflow method works, but here's a better way". I would prefer if he explained exactly how the overflow property was solving the issue and then go on to give us the other solution.
Michael Lambert6,286 Points
The sizing calculations of floated elements are ignored which otherwise would normally be factored in so the container knows how to adjust its height to contain them. By using overflow: hidden for example creates a new block formatting context which forces the container to consider the sizes of the floated elements.