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A Pen By Scott Kellum Pro

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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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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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About External Resources

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If the stylesheet 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 CSS 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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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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About ES6 Modules

Modules are a feature that allow your browsers JavaScript to use import statements to import functions, objects or primitives.

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Add External Scripts/Pens

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About External Resources

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

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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HTML

            
              <label class="toggle">
  <input type="checkbox" /><div></div>
</label>
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CSS

            
              body {
  font-size: 32px;
  background-color: #222;
}

.toggle {
  position: fixed;
  top: 50%;
  left: 50%;
  transform:
    translateX(-50%)
    translateY(-50%);
  width: 1.6em;
  height: 1em;
  border-radius: .5em;
  overflow: hidden;
  cursor: pointer;
  filter:
    contrast(20)
    hue-rotate(150deg)
    saturate(4);
  box-shadow:
    0 0 0 2px #fff,
    0 0 1em 0 #000;
  input {
    display: none;
  }
  div {
    background: #444;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
    transition: all .4s ease-in-out;
  }
  input:checked ~ div {
    background: #f00;
  }
  div:before,
  div:after {
    content: '';
    position: absolute;
    width: .8em;
    height: .8em;
    background: #fff;
    border-radius: 100%;
    top: .5em;
    left: .5em;
    transition: transform .4s ease-in-out;
    transform:
      translateX(-50%)
      translateY(-50%)
      scale(.4);
    filter: blur(.1em);
  }
  div:before {
    background: #999;
    transition-delay: .13s;
  }
  input:checked + div:before,
  input:checked + div:after {
      transform:
        translateX(20%)
        translateY(-50%);
  }
}
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JS
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999px
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