All: Define defaultElement for non-div widgets.

ui/jquery.ui.autocomplete.js

@@ -16,6 +16,7 @@
 (function( $, undefined ) {
 
 $.widget( "ui.autocomplete", {
+	defaultElement: "<input>",
 	options: {
 		appendTo: "body",
 		delay: 300,

ui/jquery.ui.button.js

@@ -43,6 +43,7 @@ var lastActive,
 	};
 
 $.widget( "ui.button", {
+	defaultElement: "<button>",
 	options: {
 		disabled: null,
 		text: true,

ui/jquery.ui.menu.js

@@ -16,6 +16,7 @@
 var idIncrement = 0;
 
 $.widget("ui.menu", {
+	defaultElement: "<ul>",
 	_create: function() {
 		var self = this;
 		this.menuId = this.element.attr( "id" ) || "ui-menu-" + idIncrement++;

ui/jquery.ui.spinner.js

@@ -14,6 +14,7 @@
 (function($) {
 
 $.widget('ui.spinner', {
+	defaultElement: "<input>",
 	options: {
 		incremental: true,
 		max: null,