scaling html content in Adobe Air

gistfile1.as

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
					   xmlns:s="library://ns.adobe.com/flex/spark" 
					   xmlns:mx="library://ns.adobe.com/flex/mx">
	
	<fx:Script>
		<![CDATA[
			protected function zoomInHandler(event:MouseEvent):void
			{
				html.htmlLoader.window.document.body.style.zoom = 1.5;
			}
			
			protected function resetZoomHandler(event:MouseEvent):void
			{
				html.htmlLoader.window.document.body.style.zoom = 1.0;
			}
			
			protected function zoomOutHandler(event:MouseEvent):void
			{
				html.htmlLoader.window.document.body.style.zoom = 0.5;
			}
			
			
			
		]]>
	</fx:Script>

	<s:Button x="10" y="10" label="Zoom in" click="zoomInHandler(event)"/>
	<s:Button x="88" y="10" label="Reset zoom" click="resetZoomHandler(event)"/>
	<s:Button x="181" y="10" label="Zoom out" click="zoomOutHandler(event)"/>
	<mx:HTML id="html" x="10" y="39" width="1057" height="621" location="http://www.google.com"/>
	
</s:WindowedApplication>