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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-.

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

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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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Packages

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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 Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                <!-- Add active class to list item to have it open by default ?-->

<div id="accordion">
  <ul>
    <li><a href="#">Home</a></li>
    <li>
      <a href="javascript:alert( 'Link Activated')">About Us</a><i>+</i>
      <ul>
        <li><a href="#">Our History</a></li>
        <li><a href="#">Who We Are</a></li>
        <li><a href="#">Employment &amp; Training</a></li>
      </ul>
    </li>
     <li>
      <a href="javascript:alert( 'Link Activated')">Products</a><i>+</i>
      <ul>
        <li><a href="#">Retail Products</a></li>
        <li><a href="#">Wholesale Products</a></li>
        <li><a href="#">Quality &amp; Food Safety</a></li>
      </ul>
    </li>
    <li><a href="#">Contact</a></li>
   
  </ul>
</div>
!

CSS 

              
                
html {
  box-sizing: border-box;
}

*, *:before, *:after {
  box-sizing: inherit;
  -moz-box-sizing: inherit;
  -webkit-box-sizing: inherit;
}

body {
  font-family: 'Open Sans', sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  margin:0;
  background-color:#ddd;
  color:#333;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration:none;
  color:#555;
}

i {
  padding:1em 1.5em;
  /*background-color:#fff;*/
  cursor:pointer;
  float:right;
  font-style:normal;
  position:absolute;
  display:inline-block;
  right:0;
  color:#aaa;
  /*margin: .5em  .5em 0 0;*/
  /*border-radius:50%:*/
/*  width:3em;*/
}

i:hover {
  /*background-color:#f7f7f7;*/
  color:#333;
}



#accordion {
	background: #fff;
	width: 250px;
	margin: 100px auto 0 auto;
  font-size:15px;
}

#accordion ul{
  list-style-type: none;
  padding:0;
  font-weight:bold;
}

#accordion ul a {
  padding:1em 2em;
  display:inline-block;
  width:100%;
}

#accordion ul a:hover {
  color:#999;
 /* background-color:#f7f7f7;*/
}

/*list items*/
#accordion li {
  position:relative;
 /* border-bottom:1px solid #eee;*/
 /*padding:.5em;*/
}

/*#accordion a {
  padding:1em;
}*/

#accordion ul ul{
  padding:.75em 0;
  border-top:1px solid #eee;
  border-bottom:1px solid #eee;
  background-color:#f8f8f8;
}


#accordion ul ul li a {
	text-decoration: none;
	font-size: 14.5px;
	line-height: 27px;
	display: block;
   font-weight:normal;
/*	padding: 5px 15px;*/
 background-color:#f8f8f8;
  padding:.6em 2em .6em 3.5em;

}
/*hover effect on links*/
#accordion ul ul li a:hover {
	background: #f2f2f2;
}
/*Lets hide the non active LIs by default*/
#accordion ul ul {
	display: none;
}
#accordion li.active ul {
	display: block;
}
!

JS 

              
                //Original version spelt accordion accordian?

/*jQuery time*/
$(document).ready(function(){
	$("#accordion i").click(function(){
		//slide up all the link lists
		$("#accordion ul ul").slideUp(200);
		//slide down the link list below the h3 clicked - only if its closed
		if(!$(this).next().is(":visible"))
		{
			$(this).next().slideDown(200);
		}
	})
})

$(function() {
    FastClick.attach(document.body);
});
!
999px

Console