http://tutorialzine.com/2013/10/12-awesome-css3-features-you-can-finally-use/
http://codepen.io/ericterpstra/pen/DHbaK
http://shreelimbkar.wordpress.com/2012/07/16/the-30-css-selectors-you-must-memorize/
http://ericterpstra.com/tag/css3/
http://www.htmllion.com/css3quiz.html