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HTML

About HTML Preprocessors

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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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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).

Add External Stylesheets/Pens

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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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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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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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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <h1>OSX-style Disk Usage <xmp>..using html5 <meter></xmp></h1>

<p>
  Macintosh HD <span class="free-space">64.54 GB free out of 120.47 GB</span></p>

<meter value="55.93" min="0" max="120.47" title="GB">
  <div class="meter-gauge">
    <span style="width: 46.42%;">Disk Usage - 55.93GB out of 120GB</span>
  </div>
</meter>  
  
<ul class="swatch">
  <li class="swatch__elem">Audio <span class="used-space">670.5 MB</span></li>
  <li class="swatch__elem">Movies <span class="used-space">10.1 GB</span></li>
  <li class="swatch__elem">Photos <span class="used-space">25.19 GB</span></li>
  <li class="swatch__elem">Apps <span class="used-space">19.31 GB</span></li>
  <li class="swatch__elem">Other <span class="used-space">660.5 MB</span></li>
</ul>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Roboto);

body {
  
  font-family: "Roboto", "Lucida Grande", "Lucida", sans-serif;
  margin: 5em auto;
  background: radial-gradient(#f9f9f9 20%, #ddd 80%);
  width: 550px;
}

h1 {
  
  font-size: 1.5em;
  margin: 0 auto 2.5em;
  font-weight: 700;
}

xmp {
  
  font-family: Consolas, Monaco, monospace;
  font-size: 85%;
  color: #666;
  font-weight: 400;
}

meter {
  
  display: block;
  margin: 0 auto;
  
  width: 550px;
  height: 25px;
  
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;

  border: 1px solid #ccc;
  border-radius: 3px;
  
  /* Firefox */
  background: none; /* Required to get rid of the default background prop. */
  background-color: whiteSmoke;  
  box-shadow: 0 5px 5px -5px #333 inset;
}

meter::-webkit-meter-bar {
  
  background: none; /* Important to get rid of default background. */
  background-color: whiteSmoke;
  
  box-shadow: 0 5px 5px -5px #333 inset;
}

meter::-webkit-meter-optimum-value {
  
  transition: width .5s;
  box-shadow: 0 5px 5px -5px #999 inset;
  
  background-image: linear-gradient( 90deg, 
                                     #8bcf69 5%, 
                                     #e6d450 5%,
                                     #e6d450 15%,
                                     #f28f68 15%,
                                     #f28f68 55%,
                                     #cf82bf 55%,
                                     #cf82bf 95%,
                                     #719fd1 95%,
                                     #719fd1 100%);
  
  background-size: 100% 100%;
}

meter::-webkit-meter-optimum-value:hover {
  
  background-image: linear-gradient( 90deg, 
                                     #8bcf69 20%, 
                                     #e6d450 20%,
                                     #e6d450 40%,
                                     #f28f68 40%,
                                     #f28f68 60%,
                                     #cf82bf 60%,
                                     #cf82bf 80%,
                                     #719fd1 80%,
                                     #719fd1 100%);
  
  transition: width .5s;
  width: 100% !important; /* !important keyword used to override the inline style in ebkit browsers. */
}

meter::-moz-meter-bar {
  
  box-shadow: 0 5px 5px -5px #999 inset;
  
  background-image: linear-gradient( 90deg, 
                                     #8bcf69 5%, 
                                     #e6d450 5%,
                                     #e6d450 15%,
                                     #f28f68 15%,
                                     #f28f68 55%,
                                     #cf82bf 55%,
                                     #cf82bf 95%,
                                     #719fd1 95%,
                                     #719fd1 100%);
  
  background-size: 100% 100%;
}

p {
 
  margin: 0 auto ;
  width: 550px;
  line-height: 2.5;
}

.free-space {
  
  float: right;
}

.swatch {
  
  margin: 0; padding:0;
  margin: 5em auto;
  list-style-type: none;
  width: 550px;
  display: block;
  position: relative;
}

.swatch::before {
  
  content: '';
  width: 100%;
  height: 10px;
  outline: 0px solid #000;
  position: absolute;
  top: -20px;
  left: 0;
  border-radius: 2px;
  
  background-image: linear-gradient( 90deg, 
                                     #8bcf69 20%, 
                                     #e6d450 20%,
                                     #e6d450 40%,
                                     #f28f68 40%,
                                     #f28f68 60%,
                                     #cf82bf 60%,
                                     #cf82bf 80%,
                                     #719fd1 80%,
                                     #719fd1 100%);

}

.swatch__elem {
  
  outline: 0px solid #c00;
  float: left;
  width: 110px;
  padding-left: 5px;

  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}

.used-space {
  
  display: block;
  line-height: 2;
  font-size: 85%;
  color: #666;
}

.meter-gauge {

    border: 1px solid #ccc;
    border-radius: 3px;

    background-color: whiteSmoke;
    box-shadow: 0 5px 5px -5px #333 inset;

    width: 550px;
    height: 25px;
    
    display: block;
}
  
.meter-gauge > span {
 
  height: inherit;  
  box-shadow: 0 5px 5px -5px #999 inset;
  
  background-color: blue;
  background-image: linear-gradient( 90deg, 
                                     #8bcf69 5%, 
                                     #e6d450 5%,
                                     #e6d450 15%,
                                     #f28f68 15%,
                                     #f28f68 55%,
                                     #cf82bf 55%,
                                     #cf82bf 95%,
                                     #719fd1 95%,
                                     #719fd1 100%);
  
  background-size: 100% 100%;

  display: block;
  text-indent: -9999px;
}
!

JS
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999px

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