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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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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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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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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 

              
                <svg xmlns="http://www.w3.org/2000/svg" viewBox="-1 0 122 120" class="logo">
  
  <path class="outer-ring" d="M60,0C26.863,0,0,26.863,0,60c0,33.138,26.863,60,60,60c33.137,0,60-26.861,60-60C120,26.863,93.138,0,60,0z M60,110.146
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</svg>
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CSS 

              
                .logo {
  width: 150px;
  height: 150px;
}

.inner-box {
  fill: red;
  transform-origin: center center;
  animation: doRotate 5s infinite linear; 
}

@keyframes doRotate {
  to {
    transform: rotate(360deg);
  }
}

body {
  text-align: center;
}
!

JS
!
999px

Console