srcset resolutions now treated as minimum resolutions.

picturefill.js

@@ -60,24 +60,24 @@
 				}
 
 				if( srcset ) {
-					var screenRes = w.devicePixelRatio || 1, // Is it worth looping through reasonable matchMedia values here?
+					var screenRes =  w.devicePixelRatio || 1, // Is it worth looping through reasonable matchMedia values here?
 						sources = srcset.split(","); // Split comma-separated `srcset` sources into an array.
 
 					for( var res = sources.length, r = res - 1; r >= 0; r-- ) { // Loop through each source/resolution in `srcset`.
 						var source = sources[ r ].replace(/^\s*/, '').replace(/\s*$/, '').split(" "), // Remove any leading whitespace, then split on spaces.
-							resMatch = parseInt( source[1], 10 ); // Parse out the resolution for each source in `srcset`.
+							resMatch = parseFloat( source[1], 10 ); // Parse out the resolution for each source in `srcset`.
 
-						if( resMatch == screenRes && picImg.getAttribute( "src" ) !== source[0] ) {
+						if( screenRes >= resMatch && picImg.getAttribute( "src" ) !== source[0] ) {
 							var newImg = document.createElement("img");
 
 							newImg.src = source[0];
-
 							// When the image is loaded, set a width equal to that of the original’s intrinsic width divided by the screen resolution:
 							newImg.onload = function() {
-								this.width = ( this.cloneNode( true ).width / screenRes ); // Clone the original image into memory so the width is unaffected by page styles
+								this.width = ( this.cloneNode( true ).width / resMatch ); // Clone the original image into memory so the width is unaffected by page styles
 							}
 							picImg.parentNode.replaceChild( newImg, picImg );
 						}
+						break;
 					}
 				} else {
 					// No `srcset` in play, so just use the `src` value: