https://www.sitepoint.com/find-javascript-code-snippets-by-functionality-with-cocycles/
http://lifehacker.com/5974605/learn-beginner-and-advanced-htmlcss-skills-for-free
http://www.macworld.co.uk/how-to/mac/how-learn-html-css-web-design-on-your-mac-3639294/