Actualización

app/Resources/public/assets/modernizr/feature-detects/forms-placeholder.js

@@ -0,0 +1,10 @@
+// testing for placeholder attribute in inputs and textareas
+// re-using Modernizr.input if available
+
+Modernizr.addTest('placeholder', function(){
+
+  return !!( 'placeholder' in ( Modernizr.input    || document.createElement('input')    ) && 
+             'placeholder' in ( Modernizr.textarea || document.createElement('textarea') )
+           );
+
+});