http://www.codecademy.com/courses/web-beginner-en-v6phg/2?curriculum_id=50a3fad8c7a770b5fd0007a1#!/exercises/4
jQuery 1.8.3, HTML, CSS, JavaScript
jQuery Compat (edge), HTML, CSS, JavaScript
No-Library (pure JS), HTML, CSS, JavaScript
http://stackoverflow.com/questions/16007419/angularjs-modifying-data-before-http
jQuery 1.9.1, HTML, CSS, JavaScript
jQuery 2.0.0b1, HTML, CSS, JavaScript
http://stackoverflow.com/questions/15715256/keycode-issue-cant-prevent-entering-the-character