What Is Modernizr
It is a
JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Why use Modernizr?
Taking advantage of cool new web technologies is great fun, until you
have to support browsers that lag behind. Modernizr makes it easy for you to
write conditional JavaScript and CSS to handle each situation, whether a
browser supports a feature or not. It’s perfect for doing progressive
enhancement easily.
How it works
Modernizr runs quickly on page load to detect features; it then creates
a JavaScript object with the results, and adds classes to the html element for you to key your CSS on. Modernizr supports dozens of tests,
and optionally includes YepNope.js for
conditional loading of external .js and .css resources.
Source : Internet
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