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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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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

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

Add Packages

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="content-box">
   <div id="ribbon-container">
      <a href="#" id="ribbon">here's your link</a>
   </div>
</div>
!

CSS 

              
                      
* {
  padding: 0;
  /* Standard Reset, and we're adding box-sizing:border-box because it's awesome. */
  
  margin: 0;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -webkit-transition: all 0s ease-in-out;
  -moz-transition: all 0s ease-in-out;
  -o-transition: all 0s ease-in-out;
  transition: all 0s ease-in-out;
}

.content-box {
  width: 100%;
  height: 400px;
  max-width:80%;
  margin: 94px auto 0 auto;
  position: relative;
  /* So we can position the banner within the box */
  
  background: gray;
  border: 5px solid white;
  box-shadow: 0 0 10px rgba(0, 0, 0, .3);
  -moz-box-shadow: 0 0 10px rgba(0, 0, 0, .3);
  -webkit-box-shadow: 0 0 10px rgba(0, 0, 0, .3);
}

#ribbon-container {
  position: absolute;
  top: 15px;
  right: -20px;
  overflow: visible;
  /* so we can see the pseudo-elements we're going to add to the anchor */
  
  font-size: 18px;
  /* font-size and line-height must be equal so we can account for the height of the banner */
  
  line-height: 18px;
}

#ribbon-container:before {
  content: "";
  height: 0;
  width: 0;
  display: block;
  position: absolute;
  top: 3px;
  left: 0;
  border-top: 29px solid rgba(0, 0, 0, .3);
  /* These 4 border properties create the first part of our drop-shadow */
  
  border-bottom: 29px solid rgba(0, 0, 0, .3);
  border-right: 29px solid rgba(0, 0, 0, .3);
  border-left: 29px solid transparent;
}

#ribbon-container:after {
  /* This adds the second part of our dropshadow */
  
  content: "";
  height: 3px;
  background: rgba(0, 0, 0, .3);
  display: block;
  position: absolute;
  bottom: -3px;
  left: 58px;
  right: 3px;
}

#ribbon-container a {
  display: block;
  padding: 20px;
  position: relative;
  /* allows us to position our pseudo-elements properly */
  
  background: #0089d0;
  overflow: visible;
  height: 58px;
  margin-left: 29px;
  color: #fff;
  text-decoration: none;
}

#ribbon-container a:after {
  /* this creates the "folded" part of our ribbon */
  
  content: "";
  height: 0;
  width: 0;
  display: block;
  position: absolute;
  bottom: -15px;
  right: 0;
  border-top: 15px solid #004a70;
  border-right: 15px solid transparent;
}

#ribbon-container a:before {
  /* this creates the "forked" part of our ribbon */
  
  content: "";
  height: 0;
  width: 0;
  display: block;
  position: absolute;
  top: 0;
  left: -29px;
  border-top: 29px solid #0089d0;
  border-bottom: 29px solid #0089d0;
  border-right: 29px solid transparent;
  border-left: 29px solid transparent;
}

#ribbon-container a:hover {
  background: #009ff1;
}

#ribbon-container a:hover:before {
  /* this makes sure that the "forked" part of the ribbon changes color with the anchor on :hover */
  
  border-top: 29px solid #009ff1;
  border-bottom: 29px solid #009ff1;
}
!

JS
!
999px

Console