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can

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MIT-licensed, client-side, JavaScript framework that makes building rich web applications easy.

canjs.com

canjs/canjs

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// http://dev.w3.org/csswg/css3-conditional/#at-supports // github.com/Modernizr/Modernizr/issues/648 // Relies on the fact that a browser vendor should expose the CSSSupportsRule interface // http://dev.w3.org/csswg/css3-conditional/#the-csssupportsrule-interface Modernizr.addTest("supports","CSSSupportsRule" in window);