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As for feature detection, Modernizr is the an open source JavaScript library that is widely used and has a reputation for being eficient. On the message to upgrade the browser it's a good practice to point to a site where they can chose modern browsers. PLease note some browsers have specific system requirements like for example a minimum operating system ...


You want Modernizr, a feature based detection library. Combine that with Browsehappy.org, and you should be able to detect when someone is on a browser that can't support your website, and they'll be able to easily either upgrade or move to a better browser.

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