A lesson in webdev history by Jason Hoffman:
The clearfix, for those unaware, is a CSS hack that solves a persistent bug that occurs when two floated elements are stacked next to each other. When elements are aligned this way, the parent container ends up with a height of 0, and it can easily wreak havoc on a layout. The clearfix was invented to solve all that.
But to understand the clearfix, you have to go back even further, to the 2004 and a particular technique called the Holly hack.
I had some nostalgic flashbacks whilst reading this 🙂