/*! matchMedia() polyfill - Test a CSS media type/query in JS. Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas. Dual MIT/BSD license */ /*! NOTE: If you're already including a window.matchMedia polyfill via Modernizr or otherwise, you don't need this part */ (function(w){ "use strict"; w.matchMedia = w.matchMedia || (function( doc, undefined ) { var bool, docElem = doc.documentElement, refNode = docElem.firstElementChild || docElem.firstChild, // fakeBody required for fakeBody = doc.createElement( "body" ), div = doc.createElement( "div" ); div.id = "mq-test-1"; div.style.cssText = "position:absolute;top:-100em"; fakeBody.style.background = "none"; fakeBody.appendChild(div); return function(q){ div.innerHTML = ""; docElem.insertBefore( fakeBody, refNode ); bool = div.offsetWidth === 42; docElem.removeChild( fakeBody ); return { matches: bool, media: q }; }; }( w.document )); }( this ));