- HTML5 / XHTML
- CSS2.1 / CSS3
- JavaScript / Ajax
- jQuery
- HTML5 Boilerplate
- Modernizr
- YUI Library
- OOCSS
- CSS Grids
- CSS Frameworks / Resets
- Progressive Enhancement / Graceful Degradation
- HTML and CSS Specifications (W3C / WHATWG)
- UX / Usability
- Website Speed / Performance
- Debugging Tools (Firebug, etc)
- Dojo / MooTools / Prototype
- Responsive Web Design
- Mobile Web Development
- Mobile Web Performance
- Cross-Browser / Cross-Platform Development
- Document Object Model (DOM)
- Cross-Browser Bugs and Inconsistencies (primarily IE6-8)
- CSS Pre-Processors (LESS / Sass)
- Version Control (Git / GitHub / CVS / Subversion)
- HTML5 APIs (Canvas, Geolocation, Video, etc.)
- OOP
- Back-end Templating languages/technologies (PHP, Ruby, .NET, etc)
- MySql
- Accessibility
- WAI-ARIA
- Microdata / Microformats
- HTML5/CSS3 Polyfills
- CMS (WordPress, Drupal, Joomla, etc)
- Functional Programming
- Data Formats (e.g. JSON, XML)
- Internationalization / Localization
- Content Strategy
- Offline Web Apps
- Regular Expressions
- Basic .htaccess
- SVG
- Image Editing Tools (Photoshop, Fireworks, etc.)
- Web Font Embedding / Licensing
- SEO Basics
- Haml
- CoffeeScript