Website Coding
Website Review of teachingtextbooks.com
Teaching Textbooks is the math program I use, and they have a nicely designed FAQ. All the questions are grouped into categoires, and each question is a link that brings you down to the answer. Also, after each question/answer, there is a "back to top" link for easy question navigation. So, basically every part of the FAQ uses fragment identifiers, which makes it a good FAQ.
There is a long list of errors on their FAQ page, but there are not many stand-alone errors. Most are in groups related to the same sections of code.