I used percentiles because I didn’t want the text to be completely out of whack on people viewing the web at different resolutions. My personal reason behind using that is the simple fact that I’ve come across countless web pages that use teeny tiny text for some reason or another especially professional sites and personal sites by someone who took a crash course at their college using Dreamweaver.
That’s fine, and you should make the text the size you want, but we’re saying that there are a lot of ways to specify text size other than percentiles. I always use pt for fonts, but you can also use em, ex, px, in, mm, cm, pc, and absolute units.