W3Schools - W3Schools is a web developers information website, with tutorials and references on web development...
CSS Reference - Sleek and comprehensive online reference for CSS
Awwwards - Awwards focuses on web design and has an awards system that highlights exceptional design.
MarkSheet - Browser-based guide and tutorial for HTML and CSS tutorial
A List Apart - A List Apart is a fantastic blog that recently released version 5.0 which brought a great new design. A List Apart explores the design, development, and meaning of web content, with a special focus on web standards and best practices.
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