modernizr/feature-detects/css/supports.js

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

/*!
{
  "name": "CSS Supports",
  "property": "supports",
  "caniuse": "css-featurequeries",
  "tags": ["css"],
  "notes": [{
    "name": "W3 Spec",
    "href": "http://dev.w3.org/csswg/css3-conditional/#at-supports"
  },{
    "name": "Related Github Issue",
    "href": "github.com/Modernizr/Modernizr/issues/648"
  },{
    "name": "W3 Info",
    "href": "http://dev.w3.org/csswg/css3-conditional/#the-csssupportsrule-interface"
  }]
}
!*/
define(['Modernizr'], function( Modernizr ) {
  // Relies on the fact that a browser vendor should expose the CSSSupportsRule interface

  Modernizr.addTest('supports', 'CSSSupportsRule' in window);
});