When comparing Can I use... vs Khan Academy, the Slant community recommends Khan Academy for most people. In the question“What are the best resources to learn CSS?” Khan Academy is ranked 10th while Can I use... is ranked 12th. The most important reason people chose Khan Academy is:
Khan Academy is 100% free and does not require you to sign up in order to access the courses.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Free
Khan Academy is 100% free and does not require you to sign up in order to access the courses.
Pro Motivation through gamification
Users collect badges and points through completing missions, watching videos, adding comments and more.
Pro Q & A Section
There is a Q & A section after every video where you can ask questions there and let other users answer them.
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.
Con Limited programming courses
The programming courses are not in-depth, giving students only a basic knowledge of programming. The language choices are also limited (HTML, CSS and JavaScript).