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YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
Get Started Start using YUI 3.9.0pr3 in two easy steps.
Why YUI?
Fast
YUI's lightweight core and modular architecture make it scalable, fast, and robust. Built by frontend engineers at Yahoo!, YUI powers the most popular websites in the world.
Complete
YUI's intuitive and well-documented API takes you from basic DOM handling to building performant and maintainable applications on desktop browsers, mobile devices, and servers.
Industrial Strength
A thriving community, a carefully architected infrastructure, and a comprehensive suite of tools help you code like a pro, from simple web pages to complex web applications.
Free & Open
YUI is free for all uses and is developed in the open on GitHub. Core team members can always be found in the forums and the #yui IRC channel on Freenode. Pull requests welcome!
A Few Examples
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Simple Calendar with Selection
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Drag & Drop: Interaction Groups
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Graphics: Path Drawing Tool
YUI Theater Videos
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42:40
YUI Open RoundTable 03/07/2013
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58:53
YUI Open RoundTable 02/28/2013
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1:16:05
YUI Open RoundTable 02/21/2013
YUI Theater on YouTube
@yuilibrary on Twitter
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YUI Open RoundTable stream will be here : youtube.com/user/yuilibrar…
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YUI Open RoundTable Today at 2pm pst. Streaming link will be available here.
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Call for Guest Bloggers : yuiblog.com/blog/2013/03/0…
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YUI Weekly for March 1st, 2013 - yuiblog.com/blog/2013/03/0…
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Do you use the broadcast config for your events? @ls_n wants to know! Take a moment and take this poll: docs.google.com/spreadsheet/vi…
Follow YUI on Twitter