css - Should I set the default font-size on the body or html element?

Question

I like to work in ems when creating websites. Therefore I set a default font-size of 100.01% on the body element.

My question is should I set the default font-size on the body or the html element? What are the pros and cons (if any) of both?

Answer 1

Now that the rem unit is starting to become popular, setting the base font-size on the root element (html tag) is advised (rem stands for root em).