Actualización

web/assets/modernizr/feature-detects/css-lastchild.js

@@ -0,0 +1,11 @@
+// last-child pseudo selector
+// https://github.com/Modernizr/Modernizr/pull/304
+
+
+Modernizr.addTest('lastchild', function(){
+
+  return Modernizr.testStyles("#modernizr div {width:100px} #modernizr :last-child{width:200px;display:block}", function (elem) {
+    return elem.lastChild.offsetWidth > elem.firstChild.offsetWidth;
+  }, 2);
+
+});