b and i

[Aaron Swartz]

http://mpt.net.nz/archive/2004/05/02/b-and-i

More often, people switch from i to em for everything they want 
italicized, and from b to strong for everything they want in bold. 
Authoring software often does this — tools like the original Wiki, 
Wikipedia, and Markdown make it easy to use em and strong, and harder 
(or impossible) to use i, b, or any of the other italic or bold 
elements.

This is bad.