HTML5 semantic elements intro for primary structure and content indicators

Generate pure CSS3 On/Off flipswitches with animated transitions.

iWebInspector is a free tool to debug, profile and inspect web applications running on iOS Simulator (iPhone or iPad). You can check resources, see and change HTML & CSS, use breakpoints on JavaScript code, create charts and more just as if you were on Safari for Desktop, Chrome or Firebug.

Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are.

HTML5 outline algorithm test page

The HTML5 test score is an indication of how well your browser supports the upcoming HTML5 standard and related specifications.

Trying to understand HTML5 compatibility on mobile and tablet browsers

Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.

This document’s primary motivation is two- fold: 1) code consistency and 2) best practices. By maintaining consistency in coding styles and conventions, we can ease the burden of legacy code maintenance, and mitigate risk of breakage in the future. By adhering to best practices, we ensure optimized page loading, performance and maintainable code.