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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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About the <head>

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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

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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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HTML 

              
                <div class="menu">
	<span class="bar"></span>
	<span class="bar"></span>
</div>


<!-- github  -->
<a href="https://github.com/alikinvv/hamburger-animation" target="_blank" class="github-corner" aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
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CSS 

              
                @t: 0.2s;
@delay: 0.05s;

.menu {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	overflow: hidden;
	padding: 15px;
	cursor: pointer;
	&.active {
		&:before {
			animation: slideLeft @t @delay ease-out forwards; 
		}
		&:after {animation: slideRight @t @delay ease-out forwards}
		.bar {
			animation: rotate45 @t ease-out forwards;
			&:last-child {animation: rotate135 @t @t ease-out forwards}
		}
	}
	&.back {
		&:before {
			transform: translateX(-120%);
			animation: slideBack @t @delay ease-out forwards;
		}
		&:after {
			transform: translateX(120%);
			animation: slideBack @t @delay ease-out forwards;
		}
		.bar {
			transform: rotate(-45deg);
			animation: rotateBack @t ease-out forwards;
			&:last-child {
				transform: rotate(-135deg);
				animation: rotateBack @t @t ease-out forwards;
			}
		}
	}
	&:before {
		content: '';
		display: block;
		width: 75px;
		height: 10px;
		background: #000;		
	}
	&:after {
		content: '';
		display: block;
		width: 75px;
		height: 10px;
		background: #000;		
	}
	.bar {
		display: block;
		width: 75px;
		height: 10px;
		background: #000; 
		margin: 14px 0;		
		&:last-child {
			opacity: 0;
			transform: rotate(-45deg);
			position: absolute;
			top: 25px;			
		}
	}
}

@keyframes rotate135 {
	form {
		opacity: 1;
		transform: rotate(-45deg);
	}
	to {
		opacity: 1;
		transform: rotate(-135deg);
	}
}

@keyframes rotate45 {to {transform: rotate(-45deg)}}
@keyframes rotateBack {to {transform: rotate(0)}}
@keyframes slideRight {to {transform: translateX(122%)}}
@keyframes slideLeft {to {transform: translateX(-122%)}}
@keyframes slideBack {to {transform: translateX(0)}}
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JS 

              
                $('.menu').click(function() {
	if($(this).is('.active:not(.back)')) {
		 $(this).addClass('back');
	} else if ($(this).is('.back')) {
		$(this).removeClass('back');
	} else {
		$(this).addClass('active');
	}
});
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999px

Console