When 16px Isn't 16px

I’ll make this one short. Sometimes, I’ll view a website I’m working on locally, and all appears well. Next, I commit and the fonts are wrong—they’re too big. Instead of going through checking CSS styles, cascading, inheritance, and the universal selector (*), next time I’ll follow the genius of this commenter on Stack Overflow and make sure my zoom level is correct. I feel pretty foolish right now.