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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
		<title>Document</title>
		<style type="text/css">
			body {
				background:#fff;
				color:#000;
				font-family:sans-serif;
				line-height:1.6;
			}
			
			#page {
				width:70%;
				margin:10px auto;
			}
			
			
			.tabs {
				width:100%;
				overflow:hidden;
				font-size:0.9em;
				margin:2em 0;
				zoom:1;
				padding:1px;
				position:relative;
			}
			
			.tabs dt {
				float:left;
				line-height:2;
				height:2em;
				background:#e8f0f5;
				border:1px solid #e8f0f5;
				border-bottom:0;
				padding:0 1em;
				position:relative;
				left:35px;
				margin-right:1px;
				cursor:pointer;
				
				-webkit-border-top-left-radius:10px;
				-webkit-border-top-right-radius:10px;
				-moz-border-radius-topleft:10px;
				-moz-border-radius-topright:10px;
			}
			
			.tabs dt:hover {
				background-color:#bfdff4;
			}
			
			.tabs dt.selected {
				border-color:#b0d0e9;
				background:#fff;
				z-index:3;
				cursor:auto;
			}
			
			.tabs dd {
				background:#fff;
				display:none;
				float:right;
				width:100%;
				margin:2em 0 0 -100%;
				position:relative;
				z-index:2;
			}
			
			.tabs dd.selected {
				display:block;
			}
			
			.tabs .tab-content {
				border:1px solid #b0d0e9;
				padding:20px;
				
				-webkit-border-radius:20px;
				-moz-border-radius:20px;
			}
		</style>		
        <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
	
		<script type="text/javascript">
			jQuery(function( $ ){
				$('dl.tabs dt').click(function(){
					$(this)
						.siblings()
                        .removeClass('selected')
                        .end()
						.next('dd')
                        .andSelf()
                        .addClass('selected');
				});
			});
		</script>
	</head>
	<body>
		<div id="page">			
			<dl class="tabs">
				<dt class="selected">Tab 1</dt>
				<dd class="selected">
					<div class="tab-content">
						Suspendisse eleifend nisi at ante. Phasellus euismod vestibulum nisl. Donec est mi, ultrices eget, feugiat at, pretium vitae, est. Aliquam a leo at massa dapibus consectetur. Sed eu arcu. In et felis. Cras vel justo egestas lectus tincidunt blandit. Vestibulum eu tellus non ipsum tristique adipiscing. Proin rhoncus ipsum id lorem. Etiam vulputate lectus ut urna. Nullam leo nisi, lacinia sit amet, eleifend sed, ornare sit amet, velit. Curabitur consequat est. Nullam nunc ligula, faucibus non, lacinia vel, lacinia et, mauris. Etiam pharetra cursus tellus. Proin vehicula.
					</div>
				</dd>
				
				<dt>Tab 2 with long name</dt>
				<dd>
					<div class="tab-content">
						Aenean vitae eros. In eget massa. Donec malesuada. Sed accumsan tempus nunc. Sed neque nunc, fringilla quis, pharetra ut, feugiat a, justo. Nam ac ligula. Vestibulum eros magna, porta non, tristique quis, ultricies a, arcu. Integer condimentum lorem sit amet mauris. Morbi velit felis, tincidunt sed, auctor at, tincidunt et, magna. Aenean laoreet ultrices felis. Aliquam vehicula urna ac odio. Phasellus pulvinar, sem a pretium scelerisque, orci massa consectetur lacus, eget fringilla felis diam at ligula. Donec sodales lacus ut erat. Nunc mattis diam id lorem. Sed laoreet neque id diam. Mauris et sapien. Etiam tellus enim, gravida ac, accumsan semper, malesuada et, tellus. Ut mattis velit eu ante.
					</div>
				</dd>
				
				<dt>Tab 3</dt>
				<dd>
					<div class="tab-content">
						Nulla accumsan. Aenean purus sapien, pharetra a, placerat id, egestas sed, diam. Phasellus in enim. In sollicitudin nibh ac nulla. Donec et justo in nibh molestie tincidunt. Mauris porttitor risus ac enim. Nunc mattis eros ut risus. Donec ultricies euismod nibh. Mauris faucibus tempus elit. In posuere tristique lorem. Curabitur enim velit, porttitor in, tristique at, cursus ac, enim. Maecenas varius, eros eu consectetur imperdiet, nisl justo luctus tellus, at volutpat diam felis et velit.
					</div>
				</dd>
				
				<dt>Tab 4</dt>
				<dd>
					<div class="tab-content">
						Sed eu arcu. In et felis. Cras vel justo egestas lectus tincidunt blandit. Vestibulum eu tellus non ipsum tristique adipiscing. Proin rhoncus ipsum id lorem. Etiam vulputate lectus ut urna. Nullam leo nisi, lacinia sit amet, eleifend sed, ornare sit amet, velit. Curabitur consequat est. Nullam nunc ligula, faucibus non, lacinia vel, lacinia et, mauris. Etiam pharetra cursus tellus. Proin vehicula.
					</div>
				</dd>
				
				<dt>Tab 5</dt>
				<dd>
					<div class="tab-content">
						Nam ac ligula. Vestibulum eros magna, porta non, tristique quis, ultricies a, arcu. Integer condimentum lorem sit amet mauris. Morbi velit felis, tincidunt sed, auctor at, tincidunt et, magna. Aenean laoreet ultrices felis. Aliquam vehicula urna ac odio. Phasellus pulvinar, sem a pretium scelerisque, orci massa consectetur lacus, eget fringilla felis diam at ligula. Donec sodales lacus ut erat. Nunc mattis diam id lorem. Sed laoreet neque id diam. Mauris et sapien. Etiam tellus enim, gravida ac, accumsan semper, malesuada et, tellus. Ut mattis velit eu ante.
					</div>
				</dd>
			</dl>			
		</div>
	</body>
</html>
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