UI框架（JavaScript，CSS）？ [关闭]

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            <div class="grid--cell mb0 mt8">Closed <span title="2011-05-24 20:13:05Z" class="relativetime">8 years ago</span>.</div>
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I'm looking for a free and open-source UI framework, similar to jQuery UI, but with more features and solid/clean CSS. Any links? :)

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