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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

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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Insecure Resource

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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

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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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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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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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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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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.

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HTML 

              
                // Please ❤ if you like it

// update 25/4/2019
// I'd noticed that there are a lot of people who seem interested in this pen so I changed a little bit in the logic so it would fit better on production sites and make it easier to read!

div.menu
	button.nav-tgl(type='button' aria-label='toggle menu')
		// this span just for the three dividers in the hamburger button
		span(aria-hidden='true')

	nav.nav
		// I don't care about the menu elements here so I will hide them
		ul
			li element one
			li element two
			li element three
			li element four
!

CSS 

              
                .nav {
	ul {
		display: none;
	}
}

.nav-tgl {
  display: inline-block;
  cursor: pointer;
  position: fixed;
  z-index: 100;
  right: 30px;
  top: 30px;
  width: 70px;
  height: 70px;
  border: none;
  border-radius: 50%;
  padding: 0;
  background: #fff;
	box-shadow: 0px 4px 24px rgba(#000, 0.24);
  line-height: 0.6;
  text-align: center;
	
	// making the dividers
	> span {
		// the second divider
		display: inline-block;
		position: relative;
		height: 2px;
		width: 34px;
		border-radius: 1px;
		background: #293335;
		vertical-align: middle;
		
		// the first & the third dividers
		&:before, &:after {
		  display: inline-block;
			position: absolute;
			content: "";
			height: 2px;
			border-radius: 1px;
			background: #293335;
			// for the hover state
			transition: all 200ms;
		}
		&:before {
		  top: -11px;
			left: 3px;
			width: 28px;
		}
		&:after {
		  top: 11px;
			left: 6px;
			width: 22px;
		}
	}
	
	// ofcorse we should find a replacement for the focus state but it's not our topic
	&:focus {outline: none}
	
	&:hover > span:after, &:hover > span:before {
		width: 34px;
		left: 0;
	}
}

// for the nav background (styling the nav itself is not our topic)
.nav:before {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  content: '';
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.8);
  transition: all 500ms ease-in-out;
	
	// that's all the pen about
  clip-path: circle(30px at calc(100% - 65px) 65px);
	// for AT
  visibility: hidden;
}

// when it gits activated
.menu.active {
	.nav:before {
		visibility: visible;

		// that's all the pen about
		clip-path: circle(100%);
	}
	
	.nav-tgl > span {
		height: 0;
		&:after, &:before {
		  top: 0px;
			left: 0;
			width: 34px;
		}
		&:after {
		  transform: rotate(-45deg);
		}
		&:before {
			transform: rotate(45deg);
		}
	}
}
!

JS 

              
                const menu = document.querySelector('.menu');
const btn = menu.querySelector('.nav-tgl');
btn.addEventListener('click', evt => {
	menu.classList.toggle('active');
})
!
999px

Console