Check this post written by Chris Coyier on mailto: links. "It's pretty easy to use, but as with anything web, there are lots of things to consider."
You may also be interested in ...
CodePen: build a FAQ
Are you looking for a peace of code to add a FAQ content on your website
Paged.js
Paged.js is an open-source library to paginate content in the browser. Based on the W3C specifications, it’s a sort of polyfill for Paged Media and Generated Content for Paged Media CSS modules.
Balloon.css
Simple tooltips made of pure CSS and made by Claudio Holanda. Balloon.css lets you add tooltips to elements without JavaScript and in just a few lines of CSS.
