css3files: A Must-Bookmark CSS3 Guide
There are many websites where you can find documentation for the new properties CSS3 brings but you'll probably love this the most.
css3files is an awesome website which guides users about CSS3 properties with a very friendly information and interface.
It explains every property in detail with visual guides pointing to "what every value is used for" and there are examples (with outputs).
The website also has a browser compatibility chart and a list of links to other good resource for each item.
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