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HTML

About HTML Preprocessors

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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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HTML Settings

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HTML 

              
                <p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

<table typeof="MusicGroup" vocab="http://schema.org/">
	<caption><span property="name">Bruce Springsteen</span>’s studio albums</caption>
	<thead>
		<tr>
			<th>title</th>
			<th>release date</th>
		</tr>
	</thead>
	<tbody>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Greetings from Asbury Park, N.J.</td>
			<td><time property="datePublished">1973-01-05</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">The Wild, the Innocent &amp; the E Street Shuffle</td>
			<td><time xproperty="datePublished">1973-09-11</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Born to Run</td>
			<td><time property="datePublished">1975-08-25</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Darkness on the Edge of Town</td>
			<td><time property="datePublished">1978-06-02</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">The River</td>
			<td><time property="datePublished">1980-10-10</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Nebraska</td>
			<td><time property="datePublished">1982-09-20</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Born in the U.S.A.</td>
			<td><time property="datePublished">1984-06-04</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Tunnel of Love</td>
			<td><time property="datePublished">1987-10-09</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Human Touch</td>
			<td><time property="datePublished">1992-03-31</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Lucky Town</td>
			<td><time property="datePublished">1992-03-31</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">The Ghost of Tom Joad</td>
			<td><time property="datePublished">1995-11-21</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">The Rising</td>
			<td><time property="datePublished">2002-07-30</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Devils &amp; Dust</td>
			<td><time property="datePublished">2005-04-26</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">We Shall Overcome: The Seeger Sessions</td>
			<td><time property="datePublished">2006-04-25</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Magic</td>
			<td><time property="datePublished">2007-09-25</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Working on a Dream</td>
			<td><time property="datePublished">2009-01-27</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Wrecking Ball</td>
			<td><time property="datePublished">2012-03-06</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">High Hopes</td>
			<td><time property="datePublished">2014-01-14</time></td>
		</tr>
		<tr property="album" typeof="MusicAlbum">
			<td property="name">Western Stars</td>
			<td><time property="datePublished">2019-06-14</time></td>
		</tr>
	</tbody>
</table>

<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
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CSS 

              
                html
{
	font: 1.2em/1.4 Calibri;
}

body
{
	max-width: 25em;
}

table
{
	border-collapse: collapse;
	line-height: 1;
}

thead
/* doesn’t work in Edge or Chrome yet, but works for `thead th` */
{
	position: -webkit-sticky;
	position: sticky;
	top: 0;
	background: white;
}

th, td
{
	vertical-align: top;
	text-align: start;
	padding: 0.3em 0;
}

thead th
{
	vertical-align: bottom;
	padding-bottom: 0;
}

thead th:after
{
	content: '';
	display: block;
	padding-bottom: 0.3em;
	border-bottom: thin solid silver;
}

th:last-child,
td:last-child
{
	text-align: end;
}

td:not(:first-child)
{
	padding-left: 2em;
}
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JS
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