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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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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About External Resources

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

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

You can also link to another Pen here, and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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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.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

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Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML 

              
                <div class="quote-box">
	<h2>Here are some quotes:</h2>
	<div class="quote-loop">
		<p>&ldquo;I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel.&rdquo;</p>
		<cite>- Maya Angelou</cite>
	</div>
	<div class="quote-loop quote-hide">
		<p>&ldquo;Simple is good.&rdquo;</p>
		<cite>- Jim Henson</cite>
	</div>
	<div class="quote-loop quote-hide">
		<p>&ldquo;Everybody has a plan until they get punched in the mouth.&rdquo;</p>
		<cite>- Mike Tyson</cite>
	</div>
	<div class="quote-loop quote-hide">
		<p>&ldquo;We are what we pretend to be, so we must be careful about what we pretend to be&rdquo;</p>
		<cite>- Kurt Vonnegut, Jr.</cite>

	</div>
	<div class="quote-loop quote-hide">
		<p>&ldquo;Perfect is the enemy of good.&rdquo;</p>
		<cite> - Voltaire</cite>
	</div>
</div>
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CSS 

              
                body {
	background-color: #eaeaea;
	font-family: georgia, serif;
	font-size: 200%;
	line-height: 1.2em;
}
.quote-hide {
  display: none;
}
.quote-box {
	text-align: center;
	padding: 2em;
}
h2 {
	color: #458599;
}
cite {
	font-size: 80%;
	color: #999;
}
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JS 

              
                jQuery(document).ready(function($) {
		if (  $('.quote-loop').length ){
		(function loop() {
			$('.quote-loop').each(function() {
				var $self = $(this);
				$self.parent().queue(function (n) {
					$self.fadeIn(1000).delay(12000).fadeOut(1000, n);
				});
			}).parent().promise().done(loop);
		}());
	}	
});
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999px

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