HTML, CSS and JavaScript playground

<!DOCTYPE html>
<html>
<head>
<title>Web Builder Experiment</title>
<meta charset='utf-8'>
<meta content='width=device-width, height=device-height, minimum-scale=1.0, maximum-scale=1.0' name='viewport'>
<script type='text/javascript' src='http://code.jquery.com/jquery-1.8.3.js'></script>
<script type="text/javascript" src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
<link rel="stylesheet" type="text/css" href="http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css">
<link rel='stylesheet' href='http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.css'>
<script src='http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.js' type='text/javascript'></script>
</head>
<body>
<div data-role='page'>
	<div class='header' data-role='header'>
		<div id='tools' align='center'>
			<a id='select' data-role='button' data-inline='true' data-mini='true'>Select</a>
			<a id='div' data-role='button' data-inline='true' data-mini='true'>DIV</a>
			<a id='text' data-role='button' data-inline='true' data-mini='true'>Text</a>
		</div>
		
      <h1 style='visibility:hidden; width:0; height:0; margin:0;'>NULL</h1>
	</div>
	
	<div class='content' data-role='content'>
		<div id='editor'></div>
	</div>
</div>
</body>
</html>

$(window).load(function() {
	var code = $('#code'),
		preview = $('#editor');
	
	$('#tools a').click(function() {
		$('#tools a').animate({
			"opacity": "0.6"
		});
		
		$(this).animate({
			"opacity": "1"
		});
	});
	
	$('#select').click(function() {
		$('#editor').html('Select');
	});
  
	$('#div').click(function() {
		$('#editor').html('<div>DIV</div>');
	});
	
	$('#text').click(function() {
		$('#editor').html('<span>Text</span>');
	});
	
	var fixgeometry = function() {
		// Some orientation changes leave the scroll position at something that isn't 0,0. This is annoying for user experience.
		scroll(0, 0);

// Calculate the geometry that our content area should take
		var header = $('.header:visible');
		var footer = $('.footer:visible');
		var content = $('.content:visible');
		var viewport_height = $(window).height();

var content_height = viewport_height - header.outerHeight() - footer.outerHeight();

// Trim margin/border/padding height
		content_height -= (content.outerHeight() - content.height());
		content.height(content_height);
	}; // fixgeometry

$(document).ready(function() {
		$(window).bind('orientationchange resize pageshow', fixgeometry);
	});
});