modernizr/feature-detects/requestanimationframe.js

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

/*!
{
  "name": "requestAnimationFrame",
  "property": "requestanimationframe",
  "aliases": ["raf"],
  "caniuse": "requestanimationframe",
  "tags": ["animation"],
  "authors": ["Addy Osmani"],
  "notes": [{
    "name": "W3C spec",
    "href": "http://www.w3.org/TR/animation-timing/"
  }],
  "polyfills": ["raf"]
}
!*/
/* DOC

Detects support for the `window.requestAnimationFrame` API, for offloading animation repainting to the browser for optimized performance.

*/
define(['Modernizr', 'prefixed'], function( Modernizr, prefixed ) {
  Modernizr.addTest('requestanimationframe', !!prefixed('requestAnimationFrame', window), { aliases: ['raf'] });
});