Conditionizr is a smart jQuery plugin which detects the user’s browser + pixel ratio and allows serving specific conditional JavaScript and CSS files needed.

It has conditional <html> class additions for the browser and its version in use (like <html class="ie ie8">).

Conditionizr

Any script and style can be loaded for the defined browsers. Also, similar to <html> class additions feature, it can add specific classes for retina and non-retina devices.

And, another nice feature is the ability to return the OS of the visitor which is again useful for loading any custom scripts and styles.

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