For CSS learners, there are some good documentation sites and usage examples, including
W3schools and
MDN (Mozilla Developer Network). Developer Raphael Garcia made
InstaCSS - a very convenient search in the CSS-directory MDN. This is a full-text search in the style of Google, with code highlighting and other features, the results are updated as characters are typed. All information on request is on one page, so do not look for it in the documentation sections.

The author made the project
in 24 hours , so there are still a lot of bugs. He
says that MongoDB is used on the backend, from where backbone.js pulls JSON data for the client side.
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Code on github:
github.com/rgarcia/instacss