When I first began learning CSS layout, I believed positioning elements was something I had to actively command. I imagined that every element needed to be pushed into place like pieces on a tactical map. If a heading appeared slightly off, I tried another property. If a paragraph drifted out of alignment, I forced it back with margins or positioning. Eventually I discovered that the browser already has a plan. Before any layout system is invoked, before Flexbox or Grid enter the story, every web page follows a quiet and predictable rule system called normal flow. Normal flow is the browser default layout behavior. It is the terrain upon which…