Actualización

web/assets/modernizr/feature-detects/img-webp.js

@@ -0,0 +1,20 @@
+// code.google.com/speed/webp/
+// by rich bradshaw, ryan seddon, and paul irish
+
+
+// This test is asynchronous. Watch out.
+
+(function(){
+
+  var image = new Image();
+
+  image.onerror = function() {
+      Modernizr.addTest('webp', false);
+  };  
+  image.onload = function() {
+      Modernizr.addTest('webp', function() { return image.width == 1; });
+  };
+
+  image.src = 'data:image/webp;base64,UklGRiwAAABXRUJQVlA4ICAAAAAUAgCdASoBAAEAL/3+/3+CAB/AAAFzrNsAAP5QAAAAAA==';
+
+}());