World Wide Web Consortium (W3C)
Web Standards Project
Web Accessibility in Mind
W3Schools
JavaScript Kit
The jQuery Project
HTML5 Demos
HTML5 Reset
Web Safe Font Tester
Web Style Guide
960 Grid System
W3C Markup Validator
W3C Link Checker
W3C Log Validator
WDG HTML Validator
W3C CSS Validator
Browershots
Browser Cam
(編譯來源:夢想天空 原文來自:Important Web Standards Resources For Developers)