HTML & CSS
HTML & CSS Validators- Little Web Hut - has videos and tutorials on HTML/CSS
- Your HTML Source - has info. on HTML, CSS and Javascript
- CSS Portal
- Layout generator
- HTML Tutorial
- CSS Tutorial
- SitePoint HTML Reference
- SitePoint CSS Reference
- Mozilla Developer - CSS Tutorials
- Good CSS Examples
- CSS3-menu-tutorials
- CSS3-navigation-and-menu-tutorials
- jQuery-tutorials-for-designers
- css-navigation-and-menu-tutorials
- css-references-cheat-sheets
- Online Book - Dive Into HTML 5
- wonderful-secrets-of-css3-rules
- Tutorial on Chrome Developer Tools
JavaScript, jQuery, SPAs
- LiveWeave: A JavaScript Editor with script hosting
- JSBin: A JavaScript Editor with script hosting
- SitePoint JavaScript Reference
- JavaScript-Garden
- 15 AWESOME HTML5 AND JAVASCRIPT GAMES
- Mastermind Game in JavaScript
- Sudoku (Article at: HTML5-Sudoku-Solver)
- Quircks Mode JavaScript - highly recommended
- Online Book: DOM Enlightenment - Live Examples on JSFIDDLE
- Online Book: Eloquent Javascript
- Downloadable book: JavaScript Enlightenment
- (Advanced book) JavaScript Design Patterns
- jQuery Introductory Video
- Single Page Apps