applyMedia = function()

in python/bottle/webapp/Application/static/scripts/respond.js [220:291]
55 lines of code
27 McCabe index (conditional complexity)

		applyMedia			= function( fromResize ){
			var name		= "clientWidth",
				docElemProp	= docElem[ name ],
				currWidth 	= doc.compatMode === "CSS1Compat" && docElemProp || doc.body[ name ] || docElemProp,
				styleBlocks	= {},
				lastLink	= links[ links.length-1 ],
				now 		= (new Date()).getTime();

			//throttle resize calls	
			if( fromResize && lastCall && now - lastCall < resizeThrottle ){
				clearTimeout( resizeDefer );
				resizeDefer = setTimeout( applyMedia, resizeThrottle );
				return;
			}
			else {
				lastCall	= now;
			}
										
			for( var i in mediastyles ){
				var thisstyle = mediastyles[ i ],
					min = thisstyle.minw,
					max = thisstyle.maxw,
					minnull = min === null,
					maxnull = max === null,
					em = "em";
				
				if( !!min ){
					min = parseFloat( min ) * ( min.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
				}
				if( !!max ){
					max = parseFloat( max ) * ( max.indexOf( em ) > -1 ? ( eminpx || getEmValue() ) : 1 );
				}
				
				// if there's no media query at all (the () part), or min or max is not null, and if either is present, they're true
				if( !thisstyle.hasquery || ( !minnull || !maxnull ) && ( minnull || currWidth >= min ) && ( maxnull || currWidth <= max ) ){
						if( !styleBlocks[ thisstyle.media ] ){
							styleBlocks[ thisstyle.media ] = [];
						}
						styleBlocks[ thisstyle.media ].push( rules[ thisstyle.rules ] );
				}
			}
			
			//remove any existing respond style element(s)
			for( var i in appendedEls ){
				if( appendedEls[ i ] && appendedEls[ i ].parentNode === head ){
					head.removeChild( appendedEls[ i ] );
				}
			}
			
			//inject active styles, grouped by media type
			for( var i in styleBlocks ){
				var ss		= doc.createElement( "style" ),
					css		= styleBlocks[ i ].join( "\n" );
				
				ss.type = "text/css";	
				ss.media	= i;
				
				//originally, ss was appended to a documentFragment and sheets were appended in bulk.
				//this caused crashes in IE in a number of circumstances, such as when the HTML element had a bg image set, so appending beforehand seems best. Thanks to @dvelyk for the initial research on this one!
				head.insertBefore( ss, lastLink.nextSibling );
				
				if ( ss.styleSheet ){ 
		        	ss.styleSheet.cssText = css;
		        } 
		        else {
					ss.appendChild( doc.createTextNode( css ) );
		        }
		        
				//push to appendedEls to track for later removal
				appendedEls.push( ss );
			}
		},