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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.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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 URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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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.

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

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+ add another resource

JavaScript

About JavaScript Preprocessors

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

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Babel includes JSX processing.

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.

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Packages

Add Packages

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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About Packages

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

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

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HTML 

              
                <header>
  Here is the Header
</header>
<div class="content">
  <p>Here is some short content.</p>
  <!--
  Add/Remove the following HTML to see how the page reacts with page content that is taller and shorter than the viewport.
  -->
  <!--
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc tincidunt magna et libero interdum vehicula. Phasellus imperdiet neque sit amet placerat pulvinar. Proin eu ultricies ligula, a luctus velit. Integer posuere magna quis tortor maximus, ut ultricies velit fermentum. Cras malesuada suscipit sapien, at tempor ante placerat non. Nam sem erat, congue ac dui viverra, elementum lacinia risus. Nam gravida elit et finibus iaculis. Maecenas imperdiet dolor at faucibus sodales. Cras orci nunc, blandit nec accumsan quis, consequat eu arcu. Vivamus id velit condimentum erat luctus ultrices vel et erat.</p>

<p>Quisque mauris lectus, convallis vel aliquam at, vulputate sed nunc. Etiam eget neque varius, dapibus magna a, semper turpis. Curabitur eget ante eget neque lobortis egestas nec nec leo. Proin efficitur ipsum et orci mollis, at tincidunt tortor convallis. Duis vitae massa ut urna pretium aliquam quis non mauris. Sed venenatis vestibulum feugiat. Donec ut ipsum accumsan, pulvinar tellus quis, vulputate enim. Duis auctor imperdiet dui, cursus luctus enim dictum quis. Mauris viverra placerat ex sit amet venenatis. Nam egestas dolor mi, non tempus neque hendrerit eget. In eleifend lectus vitae metus varius, eu dictum mauris facilisis.</p>

<p>Proin aliquam malesuada libero nec rhoncus. Sed ut orci convallis, ornare ante sed, scelerisque magna. Mauris dignissim egestas ligula, vitae malesuada felis egestas sed. Mauris volutpat et risus congue iaculis. Curabitur luctus vehicula urna blandit varius. Nam tristique aliquam odio, nec facilisis metus iaculis in. Mauris eu pretium mauris. Cras pharetra feugiat porttitor. Ut convallis et tortor sed commodo. Duis tincidunt eleifend ex ac porta. Mauris sagittis lorem enim, non facilisis nulla aliquam non. Maecenas tempus nisl euismod eros sagittis imperdiet. Quisque non erat finibus, congue turpis ut, bibendum lectus. Curabitur in nisi interdum, consectetur metus ultrices, interdum lorem. Nullam lectus nibh, vulputate eu sem nec, maximus viverra tortor.</p> 
  -->
</div>
<footer>
  Here is the Footer
</footer>
!

CSS 

              
                body {
  position:relative;
}
!

JS 

              
                var init_footer_placement = function(){
	console.log('init_footer_placement called');
  if ($('body > footer').length) {
		// if the footer element is present on this page...
		var viewport_height, footer_height, footer_offset, footer_bottom;
		
		$('body > footer').css('position', 'static');
    // reset footer to static position to get natural	values	
		
		viewport_height   = $(window).height();
		footer_height     = $('body > footer').outerHeight();
		footer_offset     = $('body > footer').offset();
		footer_bottom     = footer_offset.top + footer_height;		
		console.log('viewport height: ' + viewport_height);
    console.log('footer bottom: ' + footer_bottom);
		if (viewport_height > footer_bottom) {
			$('body > footer').css('position', 'absolute');
			$('body > footer').css('bottom', '-' + (viewport_height - footer_bottom) + 'px');
		}
	}
};    

jQuery( document ).ready(function() {
  $(window).on('resize', function(){
  	// call init_footer_placement everytime the viewport is resized
  	init_footer_placement();
  });
  
  // initial call to init_footer_placement function
  init_footer_placement();
});
!
999px

Console