- DevDocs - Another nice and fast frontend for the Mozilla Docs about HTML, CSS, JS, DOM and the jQuery-docs, too
- HTML5 Web Developer Edition
- The Web platform: Browser technologies - huge linklist for all modern webtechniques
- Annotated ECMAScript 5.1
- HTML5Doctor - Element index
- CSS3-Files
- The Current State of HTML5-Forms - All new form-types and attributes are documented and constantly tested in the browsers if and why the new techniques are implemented.
- HTML5Doctor
- HTML5rocks