aPD is correct - and I can verify this too..I was all "woohoo...I can now make a few things bold in my personal statement" till I read this (in the ERAS personal statement FAQs...)
May I use HTML for my Personal Statement?
The Program Director's Workstation does not display your personal statement as a Web document. It displays it as a plain text document.
P.S. I spent the entire day thinking how cool this was till I ran into the above thing..but I did keep imagining "If it doesn't work, whoever is reading my application would think what a weirdo.." because it would read "went to <br> Alaska for an expedition </br>"