The easy to use API and the community of developers around it. The tutorials and the documentation are really helpful. The library is a little bit outdated and not as up to date as other libraries such as TweenLite. I'm currently using it in a project to build a game with HTML5 and it works really well. I'm making a game where the user can create their own levels. The user can choose which tools they want to use and the game will work with it. This is the easy way to use a library and it's easy to use for a beginner.
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