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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

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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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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HTML 

              
                <div class="container">  
        <span class="button fb">  
            <a href="#"><img src="http://fivera.net/wp-content/uploads/2013/09/fejs.png" alt="">Like It</a>  
        </span>  
  
        <span class="button twit">  
            <a href="#"><img src="http://fivera.net/wp-content/uploads/2013/09/tviter.png" alt="">Tweet It</a>  
        </span>  
  
        <span class="button mail">  
            <a href="#"><img src="http://fivera.net/wp-content/uploads/2013/09/mejl.png" alt="">Email</a>  
        </span>  
    </div>
!

CSS 

              
                body {
	background: #ccc;
}

a{  
    text-decoration: none;  
    color:#333333;  
}  
  
.container{  
    width: 420px;  
    margin: 50px auto 50px; /* buttons pushed from the top by 10% */  
}  

.button{  
    margin: 8px;  
}  

.button a{  
    font-family: arial, sans-serif;
    font-size: 13px;  
	color: #777;
	text-shadow: 1px 1px 0px white;
    background: #ffffff; /* Old browsers */  
    background: -moz-linear-gradient(top, #ffffff 0%, #dfdfdf 100%); /* FF3.6+ */  
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#dfdfdf)); /* Chrome,Safari4+ */  
    background: -webkit-linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* Chrome10+,Safari5.1+ */  
    background: -o-linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* Opera11.10+ */  
    background: -ms-linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* IE10+ */  
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#dfdfdf',GradientType=0 ); /* IE6-9 */  
    background: linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* W3C */  
    -moz-border-radius: 3px;  
    -webkit-border-radius: 3px;  
    border-radius: 3px;  
    -moz-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4); 
    -webkit-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4); 
    box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
    padding: 6px 12px;  
}  

.button a:hover{  
    background: #ffffff; /* Old browsers */  
    background: -moz-linear-gradient(top, #ffffff 0%, #eee 100%); /* FF3.6+ */  
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#eee)); /* Chrome,Safari4+ */  
    background: -webkit-linear-gradient(top, #ffffff 0%,#eee 100%); /* Chrome10+,Safari5.1+ */  
    background: -o-linear-gradient(top, #ffffff 0%,#eee 100%); /* Opera11.10+ */  
    background: -ms-linear-gradient(top, #ffffff 0%,#eee 100%); /* IE10+ */  
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#eee',GradientType=0 ); /* IE6-9 */  
    background: linear-gradient(top, #ffffff 0%,#eee 100%); /* W3C */  
    -moz-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4); 
    -webkit-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4); 
    box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
}  

.button a:active{  
    background: #dfdfdf; /* Old browsers */  
    background: -moz-linear-gradient(top, #dfdfdf 0%, #f1f1f1 100%); /* FF3.6+ */  
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#dfdfdf), color-stop(100%,#f1f1f1)); /* Chrome,Safari4+ */  
    background: -webkit-linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* Chrome10+,Safari5.1+ */  
    background: -o-linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* Opera11.10+ */  
    background: -ms-linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* IE10+ */  
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#dfdfdf', endColorstr='#f1f1f1',GradientType=0 ); /* IE6-9 */  
    background: linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* W3C */  

    -webkit-box-shadow: 0px 1px 1px 1px rgba(0,0,0,0.2) inset, 0px 1px 1px 0 rgba(255,255,255,1);
    -moz-box-shadow: 0px 1px 1px 1px rgba(0,0,0,0.2) inset, 0px 1px 1px 0 rgba(255,255,255,1);  
    box-shadow: 0px 1px 1px 1px rgba(0,0,0,0.2) inset, 0px 1px 1px 0 rgba(255,255,255,1);  

}

.button a > img{  
    padding-right: 8px;  
    position: relative;  
    top: 2px;  
}
!

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