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+/**
+ * @class Ext.container.Viewport
+ * @extends Ext.container.Container
+
+A specialized container representing the viewable application area (the browser viewport).
+
+The Viewport renders itself to the document body, and automatically sizes itself to the size of
+the browser viewport and manages window resizing. There may only be one Viewport created
+in a page.
+
+Like any {@link Ext.container.Container Container}, a Viewport will only perform sizing and positioning
+on its child Components if you configure it with a {@link #layout}.
+
+A Common layout used with Viewports is {@link Ext.layout.container.Border border layout}, but if the
+required layout is simpler, a different layout should be chosen.
+
+For example, to simply make a single child item occupy all available space, use {@link Ext.layout.container.Fit fit layout}.
+
+To display one "active" item at full size from a choice of several child items, use {@link Ext.layout.container.Card card layout}.
+
+Inner layouts are available by virtue of the fact that all {@link Ext.panel.Panel Panel}s
+added to the Viewport, either through its {@link #items}, or through the items, or the {@link #add}
+method of any of its child Panels may themselves have a layout.
+
+The Viewport does not provide scrolling, so child Panels within the Viewport should provide
+for scrolling if needed using the {@link #autoScroll} config.
+{@img Ext.container.Viewport/Ext.container.Viewport.png Ext.container.Viewport component}
+An example showing a classic application border layout:
+
+    Ext.create('Ext.container.Viewport', {
+        layout: 'border',
+        renderTo: Ext.getBody(),
+        items: [{
+            region: 'north',
+            html: '<h1 class="x-panel-header">Page Title</h1>',
+            autoHeight: true,
+            border: false,
+            margins: '0 0 5 0'
+        }, {
+            region: 'west',
+            collapsible: true,
+            title: 'Navigation',
+            width: 150
+            // could use a TreePanel or AccordionLayout for navigational items
+        }, {
+            region: 'south',
+            title: 'South Panel',
+            collapsible: true,
+            html: 'Information goes here',
+            split: true,
+            height: 100,
+            minHeight: 100
+        }, {
+            region: 'east',
+            title: 'East Panel',
+            collapsible: true,
+            split: true,
+            width: 150
+        }, {
+            region: 'center',
+            xtype: 'tabpanel', // TabPanel itself has no title
+            activeTab: 0,      // First tab active by default
+            items: {
+                title: 'Default Tab',
+                html: 'The first tab\'s content. Others may be added dynamically'
+            }
+        }]
+    });
+
+ * @constructor
+ * Create a new Viewport
+ * @param {Object} config The config object
+ * @markdown
+ * @xtype viewport
+ */
+Ext.define('Ext.container.Viewport', {
+    extend: 'Ext.container.Container',
+    alias: 'widget.viewport',
+    requires: ['Ext.EventManager'],
+    alternateClassName: 'Ext.Viewport',
+
+    /*
+     * Privatize config options which, if used, would interfere with the
+     * correct operation of the Viewport as the sole manager of the
+     * layout of the document body.
+     */
+    /**
+     * @cfg {Mixed} applyTo @hide
+     */
+    /**
+     * @cfg {Boolean} allowDomMove @hide
+     */
+    /**
+     * @cfg {Boolean} hideParent @hide
+     */
+    /**
+     * @cfg {Mixed} renderTo @hide
+     */
+    /**
+     * @cfg {Boolean} hideParent @hide
+     */
+    /**
+     * @cfg {Number} height @hide
+     */
+    /**
+     * @cfg {Number} width @hide
+     */
+    /**
+     * @cfg {Boolean} autoHeight @hide
+     */
+    /**
+     * @cfg {Boolean} autoWidth @hide
+     */
+    /**
+     * @cfg {Boolean} deferHeight @hide
+     */
+    /**
+     * @cfg {Boolean} monitorResize @hide
+     */
+
+    isViewport: true,
+
+    ariaRole: 'application',
+    initComponent : function() {
+        var me = this,
+            html = Ext.fly(document.body.parentNode),
+            el;
+        me.callParent(arguments);
+        html.addCls(Ext.baseCSSPrefix + 'viewport');
+        if (me.autoScroll) {
+            html.setStyle('overflow', 'auto');
+        }
+        me.el = el = Ext.getBody();
+        el.setHeight = Ext.emptyFn;
+        el.setWidth = Ext.emptyFn;
+        el.setSize = Ext.emptyFn;
+        el.dom.scroll = 'no';
+        me.allowDomMove = false;
+        //this.autoWidth = true;
+        //this.autoHeight = true;
+        Ext.EventManager.onWindowResize(me.fireResize, me);
+        me.renderTo = me.el;
+    },
+
+    fireResize : function(w, h){
+        // setSize is the single entry point to layouts
+        this.setSize(w, h);
+        //this.fireEvent('resize', this, w, h, w, h);
+    }
+});