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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

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About the <head>

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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-.

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JavaScript

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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 id="navigation"><p>Hidden navigation for users that have trenched deep into your page!</p></div>
	<div id="percentageCounter"><h1>0%</h1></div>
<div class="container">
  <a href="https://github.com/ellenbrook/jQuery-scroll-distance-detection/" target="blank">This script has been updated. View the new (easy to use version) on Github!</a>
</div>
	<div class="content">
	<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum vitae magna ut nulla lobortis iaculis. Maecenas eleifend nibh vehicula dolor interdum auctor. Nullam ut mi a dolor luctus pulvinar in quis nunc. Mauris molestie eget odio eget porttitor. Etiam suscipit ante sapien, non iaculis lacus vulputate non. Nulla vulputate lectus vel leo pulvinar, lobortis rutrum felis porta. Cras egestas, odio ac venenatis tincidunt, dui erat congue ligula, at congue nulla urna ac tortor. Ut in dolor varius, malesuada erat in, semper nisl. Cras euismod arcu sem, ac consectetur sapien rutrum quis. Vestibulum sed feugiat nulla. Duis lacinia ac mauris dictum pellentesque. Vestibulum ut dictum sem. Sed volutpat ornare nisi, vitae faucibus diam auctor id. Nam et euismod lectus.</p>
	<p>In porttitor, velit id varius volutpat, purus purus ornare urna, in cursus mauris nibh vitae nisl. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Donec nibh neque, scelerisque a congue a, dictum eget mi. Donec iaculis mauris in porta eleifend. Nam eu nisi velit. Etiam a semper massa. Praesent consequat sapien facilisis tellus auctor, sit amet tincidunt augue faucibus. Aliquam adipiscing elit a congue malesuada. Sed justo urna, vehicula a velit sed, sollicitudin cursus nunc. In auctor sapien nunc, non aliquam nisi euismod a. Maecenas ut est fringilla massa laoreet ullamcorper at eu mauris. Praesent quis porttitor justo.</p>
		<p>Cras mattis nibh nec justo tempor, id rhoncus magna sollicitudin. Cras iaculis dolor sit amet fermentum semper. Fusce eget pellentesque turpis. Cras placerat urna at lacus placerat, sit amet hendrerit magna aliquet. Vestibulum lobortis lectus et nibh imperdiet ornare. Sed quis purus hendrerit, sodales lectus quis, auctor sem. Donec felis sapien, tincidunt eget ullamcorper ac, scelerisque at ligula. Curabitur cursus placerat vulputate. Maecenas laoreet est nunc, sit amet eleifend libero suscipit in. Duis nunc urna, porttitor a elit at, iaculis tincidunt elit. Sed quis consectetur mauris. Nam ut semper dui.</p>
			<p>Pellentesque porttitor tortor nec tortor ullamcorper, nec scelerisque mi condimentum. Morbi cursus molestie euismod. Sed ullamcorper massa rutrum arcu auctor, eu posuere nunc interdum. Mauris ac est tellus. Nullam quis odio leo. Aenean consequat, felis in tristique iaculis, neque erat semper risus, eu commodo orci nisi quis sapien. Nullam quis elementum est. Vestibulum malesuada blandit turpis, ut imperdiet justo porttitor ac. Nullam in cursus magna. Donec ultricies ante eget massa convallis, a elementum orci tincidunt. Quisque id vulputate nunc. Pellentesque ut dictum turpis, non gravida libero.</p>
				<p>Proin molestie, urna non dapibus blandit, metus magna semper nisl, id tincidunt enim urna nec nulla. Quisque in magna et ante pharetra hendrerit placerat ac urna. Sed viverra turpis in sapien pellentesque, vel tincidunt sapien volutpat. Curabitur non nulla ac augue varius fringilla et sed augue. Phasellus quis consectetur urna. Donec molestie dui et tortor blandit, vel faucibus lacus consequat. Donec nulla diam, iaculis sed egestas ac, posuere vitae dui. Donec at cursus neque, non vestibulum enim. Aliquam augue nisi, eleifend sit amet dolor sit amet, consequat posuere orci. Cras nibh tellus, ornare at libero ac, consequat porta sapien. Aliquam ut mauris quis urna scelerisque luctus in ac enim. Nam nibh libero, mollis volutpat suscipit ac, viverra vel odio. Aliquam erat volutpat. Aenean adipiscing, nulla et ultrices commodo, lectus velit sagittis tellus, eget congue augue sapien at felis. Cras nec egestas sapien. Cras dapibus leo sed dolor laoreet, at ornare felis pretium.</p>
				<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum vitae magna ut nulla lobortis iaculis. Maecenas eleifend nibh vehicula dolor interdum auctor. Nullam ut mi a dolor luctus pulvinar in quis nunc. Mauris molestie eget odio eget porttitor. Etiam suscipit ante sapien, non iaculis lacus vulputate non. Nulla vulputate lectus vel leo pulvinar, lobortis rutrum felis porta. Cras egestas, odio ac venenatis tincidunt, dui erat congue ligula, at congue nulla urna ac tortor. Ut in dolor varius, malesuada erat in, semper nisl. Cras euismod arcu sem, ac consectetur sapien rutrum quis. Vestibulum sed feugiat nulla. Duis lacinia ac mauris dictum pellentesque. Vestibulum ut dictum sem. Sed volutpat ornare nisi, vitae faucibus diam auctor id. Nam et euismod lectus.</p>
				<p>In porttitor, velit id varius volutpat, purus purus ornare urna, in cursus mauris nibh vitae nisl. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Donec nibh neque, scelerisque a congue a, dictum eget mi. Donec iaculis mauris in porta eleifend. Nam eu nisi velit. Etiam a semper massa. Praesent consequat sapien facilisis tellus auctor, sit amet tincidunt augue faucibus. Aliquam adipiscing elit a congue malesuada. Sed justo urna, vehicula a velit sed, sollicitudin cursus nunc. In auctor sapien nunc, non aliquam nisi euismod a. Maecenas ut est fringilla massa laoreet ullamcorper at eu mauris. Praesent quis porttitor justo.</p>
				<p>Cras mattis nibh nec justo tempor, id rhoncus magna sollicitudin. Cras iaculis dolor sit amet fermentum semper. Fusce eget pellentesque turpis. Cras placerat urna at lacus placerat, sit amet hendrerit magna aliquet. Vestibulum lobortis lectus et nibh imperdiet ornare. Sed quis purus hendrerit, sodales lectus quis, auctor sem. Donec felis sapien, tincidunt eget ullamcorper ac, scelerisque at ligula. Curabitur cursus placerat vulputate. Maecenas laoreet est nunc, sit amet eleifend libero suscipit in. Duis nunc urna, porttitor a elit at, iaculis tincidunt elit. Sed quis consectetur mauris. Nam ut semper dui.</p>
				<p>Pellentesque porttitor tortor nec tortor ullamcorper, nec scelerisque mi condimentum. Morbi cursus molestie euismod. Sed ullamcorper massa rutrum arcu auctor, eu posuere nunc interdum. Mauris ac est tellus. Nullam quis odio leo. Aenean consequat, felis in tristique iaculis, neque erat semper risus, eu commodo orci nisi quis sapien. Nullam quis elementum est. Vestibulum malesuada blandit turpis, ut imperdiet justo porttitor ac. Nullam in cursus magna. Donec ultricies ante eget massa convallis, a elementum orci tincidunt. Quisque id vulputate nunc. Pellentesque ut dictum turpis, non gravida libero.</p>
				<p>Proin molestie, urna non dapibus blandit, metus magna semper nisl, id tincidunt enim urna nec nulla. Quisque in magna et ante pharetra hendrerit placerat ac urna. Sed viverra turpis in sapien pellentesque, vel tincidunt sapien volutpat. Curabitur non nulla ac augue varius fringilla et sed augue. Phasellus quis consectetur urna. Donec molestie dui et tortor blandit, vel faucibus lacus consequat. Donec nulla diam, iaculis sed egestas ac, posuere vitae dui. Donec at cursus neque, non vestibulum enim. Aliquam augue nisi, eleifend sit amet dolor sit amet, consequat posuere orci. Cras nibh tellus, ornare at libero ac, consequat porta sapien. Aliquam ut mauris quis urna scelerisque luctus in ac enim. Nam nibh libero, mollis volutpat suscipit ac, viverra vel odio. Aliquam erat volutpat. Aenean adipiscing, nulla et ultrices commodo, lectus velit sagittis tellus, eget congue augue sapien at felis. Cras nec egestas sapien. Cras dapibus leo sed dolor laoreet, at ornare felis pretium.</p>
	</div>
!

CSS 

              
                $counter: true; //false to hide percentage


#navigation {
  position: fixed;
  top: -66px;
   left: 0; right: 0;
  width: 100%;
  height: 60px;
  background-color: #006699;
  box-shadow: 0px 3px 3px 0px rgba(21, 21, 21, 0.1);
/*		
#
#Edit these to change CSS transition delay, speed, and type 
#
*/
  transition: top .25s ease .5s;
}

#navigation p {
  text-align: center;
  color: #fff;
}

.container {
  text-align: center;
  margin-bottom: 2em;
}

#percentageCounter {
  @if $counter == true {
    position: fixed;
  } @else if $counter == false {
    display: none;
  }
	bottom: 10px;
	right: 10px;
}

h1 {
	font-size: +2em;
}

.content {
		width: 30%;
		margin: 0 auto;
		padding: 10px;
		border: 1px solid #000;
		background-color: #f5f5f5;
}
	
p {
	margin-bottom: 1em;
}
* { font-family: 'Open Sans', sans-serif; }
@import url(https://fonts.googleapis.com/css?family=Open+Sans:300);
!

JS 

              
                	$(window).scroll(function(){
		
		// Change this to target a different percentage
		var targetPercentage = 70;
    
		//Change this to set the height of your nav bar so it hides properly. If you have a box shadow you may have to adjust this number to be height + shadow distance
		var navBarHeight = 66;
    
		//Change this to the ID of the content you are trying to show.
		var targetID = "#navigation";
		
		//Window Math
		var scrollTo = $(window).scrollTop(),
		docHeight = $(document).height(),
		windowHeight = $(window).height();
		scrollPercent = (scrollTo / (docHeight-windowHeight)) * 100;
		scrollPercent = scrollPercent.toFixed(1);
			
		$('#percentageCounter h1').text(scrollPercent+"%");

		if(scrollPercent > targetPercentage) {
			$(targetID).css({ top: '0' });
		}
		
		if(scrollPercent < targetPercentage) {
			$(targetID).css({ top: '-'+navBarHeight+'px' });
		}
								
	}).trigger('scroll');
!
999px

Console