Coursera course "HTML, CSS, and Javascript for Web Developers" by Johns Hopkins University
Module 2 solution: http://acoelhosantos.github.io/coursera-html-css-javascript-web-dev/module2-solution/
Module 3 solution: http://acoelhosantos.github.io/coursera-html-css-javascript-web-dev/module3-solution/
Module 4 solution: http://acoelhosantos.github.io/coursera-html-css-javascript-web-dev/module4-solution/