When comparing HTML & CSS - Jon Duckett vs Can I use..., the Slant community recommends HTML & CSS - Jon Duckett for most people. In the question“What are the best resources to learn CSS?” HTML & CSS - Jon Duckett is ranked 7th while Can I use... is ranked 12th. The most important reason people chose HTML & CSS - Jon Duckett is:
The author breaks concepts down and accompanies clear explanations with illustrations and code samples.
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Pros
Pro Concepts are clearly explained
The author breaks concepts down and accompanies clear explanations with illustrations and code samples.
Pro Visually appealing layout
The content is laid out in a visually appealing way, while utilizing plenty of images to help the reader grasp the concepts being taught.
Pro Supplies usage data for all countries
Pro Provides good list of resources
When serching for a feature you typically find a nice list of really valuable resources, such as spec on w3c website, and blog posts desribing usage in details.
Cons
Con Not that good for learning
It's a super cool catalogue for people who know what they are doing, just to check if their tricks apply to certain use case or project. It doesn't serve as a good starting point nor roadmap for css newbies.