Using DOM calls from Appcelerator MobileWeb

index.js

function doClick(e) {

	if(OS_MOBILEWEB){
		
		var btn=document.createElement("BUTTON");
		btn.style.position='absolute';
		var t=document.createTextNode("CLICK ME");
		btn.appendChild(t);
		document.body.appendChild(btn);
		
	}
	
}

$.index.open();

index.xml

<Alloy>
	<Window class="container" layout="vertical">
		<Button onClick="doClick">add web button</Button>
	</Window>
</Alloy>