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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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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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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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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.

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HTML 

              
                <!-- Tutorials on: fossheim.io -->
<!-- Works best in Chrome -->
<div class="radio" aria-label="Braun radio illustration">
  <div class="speaker">
    <div class="selector">
      <div class="info">
      </div>
    </div>
    <div class="button right"></div>
    <bdiv class="button left"></div>
  </div>
</div>
!

CSS 

              
                /* Tutorials on: fossheim.io */
/* Works best in chrome */

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  background-color: #E5C657;
}

.radio {
  display: block;
  width: 540px;
  height: 330px;
  margin: 150px auto 0 auto;
  margin: calc(50vh - 160px) auto 0 auto;
  border-radius: 30px;
  background-image: linear-gradient(
    135deg,
    #C0BDAE,
    #B8B9B3,
    #E5E1E0
  );
  box-shadow: 0 0 0 8px #DCE3E0 inset,
    0px 80px 60px -70px #384140;
  position: relative;
}

.speaker {
  display: block;
  width: 495px;
  height: 290px;
  position: absolute;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  top: 20px;
  border-radius: 4px 4px 12px 12px;
  background-image: radial-gradient(
      transparent 30%,
      #F1E9E6 40%
    ),
    linear-gradient(
      #EAE7E7,
      transparent
    ),
    linear-gradient(
      90deg,
      #EAE7E7,
      transparent
    ),
    radial-gradient(
      #141912 50%,
      transparent 50%
    ),
    linear-gradient(
      135deg,
      #A8A39D,
      #9CA19A
    );
  background-size: 
    13px 13px,
    100% 2px,
    2px 100%,
    290px 290px,
    100% 100%;
  background-repeat: 
    repeat,
    repeat,
    repeat,
    no-repeat,
    no-repeat;
  background-position: 
    0 0,
    20px 0,
    0 0;
  box-shadow: 0 0 0.5px 0.75px #222C21;
}

.button {
  display: block;
  width: 45px;
  height: 45px;
  border-radius: 30px;
  position: absolute;
  bottom: 15px;
  background-color: blue;
  background-image: radial-gradient(#EFF0F4 58%, transparent 62%),
    radial-gradient(#E0E2DF 20%, #CDC8CB 50%);
  background-size: 100% 100%, 300% 300%;
  background-repeat: no-repeat;
  background-position: 3px 2px, -80px -50px;
}

.button.right {
  right: 50px;
  box-shadow: 15px 10px 20px -8px #717168,
    0 0 1.5px -0.5px #717168;
}

.button.left {
  right: 145px;
  box-shadow: 15px 15px 24px -8px #717168,
    0 0 1.5px -0.5px #717168;
}

.selector {
  display: block;
  width: 200px;
  height: 200px;
  border-radius: 100px;
  background-color: black;
  position: absolute;
  top: 15px;
  right: 25px;
  background-image: radial-gradient(
      #7D7E84 64%,
      transparent 65%
    ),
    radial-gradient(
       #9CA9A8 20%,
       #7E828D 60%,
       #888B92
    );
  background-repeat: no-repeat;
  background-position: 2px 2px, -175px -175px;
  background-size: 100% 100%, 200% 200%;
}

.info {
  display: block;
  width: 165px;
  height: 165px;
  border-radius: 100px;
  position: absolute;
  right: 15px;
  bottom: 15px;
  background-image: radial-gradient(
      #E2EBED 23%,
      transparent 24%
    ),
    radial-gradient(
      black 0%,
      transparent 70%
    ),
    linear-gradient(
      transparent,
      transparent
    ),
    linear-gradient(
      -45deg,
      transparent 49%,
      #BB2B39 50% 52%,
      transparent 53%
    ),
    linear-gradient(
      #AFB5B3 50%,
      #999795 50%
    );
  background-image: radial-gradient(
      #E2EBED 23%,
      transparent 24%
    ),
    radial-gradient(
      black 0%,
      transparent 70%
    ),
    conic-gradient(
      transparent 0% 14%,
      rgba(245,254,254,0.3) 16% 19%,
      rgba(255,255,255,0.6) 25% 30%,
      rgba(245,254,254,0.2) 32% 35%,
      transparent 40% 65%,
      rgba(245,254,254,0.4) 68% 73%,
      rgba(255,255,255,0.6) 76% 80%,
      rgba(245,254,254,0.2) 83% 85%,
      transparent 89% 100%
    ),
    linear-gradient(
      -45deg,
      transparent 49%,
      #BB2B39 50% 52%,
      transparent 53%
    ),
    linear-gradient(
      #AFB5B3 50%,
      #999795 50%
    );
  background-size: 
    100% 100%,
    60px 60px,
    100% 100%,
    50% 50%,
    100% 100%;
  background-repeat: no-repeat;
  background-position: 
    0 0, 
    58px 57px,
    0 0,
    100% 0,
    0 0;
  box-shadow: -6px 0px 1px #7E828D inset,
    4px 4px 8px -3px #191418 inset,
    5px 5px 20px -10px #384140 inset;
}
!

JS
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