Sara Soueidan wrote an extensive CSS reference; seriously, this is one of the most detailed and useful sources for learning CSS.
An excellent, in-depth article on transitioning the CSS codebase at Etsy to SCSS by Dan Na.
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Articles & Tutorials
Chris Wright outlines a strategy of how you can enhance your layouts with Flexbox today without having to wait around for browsers to catch up. Included are some suggestions of possible layout enhancements, tips, troubleshooting as well as some step by step examples.
Stuart Tayler looks at the humble email field and how entering an address could be simplified, through auto-suggesting the domain.
Lyza D. Gardner is cautiously optimistic about the future of post-processors, but also has a solution you can implement right now to save yourself from both unchecked pre-processors and unseasoned post-processors.
If you’ve been treating “people with disabilities” as an edge case for your websites, consider this a reckoning. Web accessibility means that people can use the web.
Lucas Bebber explains how SVG filters work and how you can use them to create a very cool gooey effect.
Grunticon is a Grunt.js task that makes it easy to use SVGs for crisp, resolution independent icons, logos, illustrations and background images.
Reasonable Standard for CSS Stylesheet Structure; BEM-like methodology with a couple of interesting suggestions.
Daniel Lin shows that your CSS experiments don’t have to be complex to draw attention; they just have to be imaginative.