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A Pen By Vincent De Oliveira

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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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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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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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Use npm Packages

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HTML

            
              <!-- raw import from dabblet -->
<div id="div">Contenu</div>
<button onclick="var div = document.getElementById('div');if(div.className =='on'){div.className='';}else{div.className='on'}">:hover</button>
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CSS

            
              html{font:2em sans-serif;color:#fff;}
div{position:relative;width:150px;height:150px;margin:auto;min-width:150px;max-width:150px;padding:20px;background:#888;transition:all 1s;}
div::after{content:'Pseudo';position:absolute;left:20px;bottom:20px;background:deepskyblue;width:inherit;padding:inherit;}
div:hover,div.on{width:250px;}

button{
display:block;
width:120px;
height:30px;
margin:10px auto;
border:none;
border:1px solid rgba(0,0,0,.5);
border-radius:2px;
color:white;
background:#333;
background:linear-gradient(#444,#202020);
box-shadow:0 1px 0 rgba(255,255,255,.3) inset,0 1px 0 rgba(255,255,255,.3);
}
button:hover,button:focus{
background:#444;
background:linear-gradient(#555,#202020);
}
button:active{
background:#111;
background:linear-gradient(#202020,#111);
box-shadow:0 1px 0 rgba(0,0,0,.3) inset,0 1px 0 rgba(255,255,255,.3);
}
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JS
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999px
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