A Modern CSS Reset
A reset of sensible defaults by Andy Bell
Debugging CSS
An ebook with lots of tips and techniques on how to debug CSS the right way with easy and studied methods.
Animate.css
Fluidity
Quick Tip: How to Target IE6, IE7, and IE8 Uniquely with 4 Characters | Nettuts+
A reminder of IE8/IE7/IE6 hacks
The ultimate CSS tools for web designers | CSSmatic
Gradient generator, border radius, noise and box shadow
geuis/helium-css · GitHub
Helium is a tool for discovering unused CSS across many pages on a web site
Typeplate » A typographic starter kit encouraging great type on the Web
A neat typographic starter kit
Cross Browser Retina/High Resolution Media Queries
Font Custom
Generate your own font icon files
Responsive background images with fixed or fluid aspect ratios – Voormedia
What's the easiest way to scale background images in responsive layouts? We use an old technique and enhance it to fluidly change the aspect ratio of background images.
Ultimate CSS Gradient Generator - ColorZilla.com
Useful to generate IE 6-98 and 9 gradients (filter or svg)
Coding for Retina on the web
Home - Scalable and Modular Architecture for CSS
A brilliant and inspiring book. Not only useful, but fun to read too. Full of good tips and ideas. I love the approach.
* { box-sizing: border-box } FTW
3+ Ways to Preload Images Using CSS, JavaScript, or Ajax • Perishable Press
Prefixr
Generate cross-browser CSS
spin.js
Generate a cross-browser spinner in CSS
Don’t use IDs in CSS selectors?
CSS selection styles
::selection
Optimiser son application web pour iPhone ou iPod Touch
Good summary of principal tips to start off with
HTML5Rocks - Best Practices for a Faster Web App with HTML5
Google's tips and playground
Announcing an HTML5 mobile app framework for touch devices
check this out
Image Cross Fade Transition with jQuery
Fade one image into another @rem
Install multiple versions of IE on your PC | TredoSoft
For use on Windows
24 ways: Working With RGBA Colour
zen-coding
Set of plugins for HTML and CSS hi-speed coding