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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

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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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 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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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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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 

              
                <svg viewBox="0 0 240 210" xmlns="http://www.w3.org/2000/svg" >
  <path id="start1" d="M82.904 32.625c21.258 0 40.251 9.946 52.722 25.508 9.542 11.907 15.266 27.102 15.266 43.647 0 38.168-30.465 69.155-67.988 69.155-37.524 0-67.988-30.987-67.988-69.155 0-38.168 30.464-69.155 67.988-69.155z" fill="green"/>
  <path id="end1" d="M82.904 32.625c21.258 0 59.138 12.775 76.444 22.431 19.628 10.952 81.134 46.925 33.398 44.099-38.757-2.295-54.774 75.122-109.842 71.78-37.45-2.273-67.988-30.987-67.988-69.155 0-38.168 30.464-69.155 67.988-69.155z" fill="green"/>
</svg>

<svg viewBox="0 0 240 210" xmlns="http://www.w3.org/2000/svg">
  <path id="two" d="M82.904 32.625c32.655.277 66.612 21.182 75.064 25.806 5.717 3.128 72.555 55.102 70.058 54.167-69.595-26.075-90.054 61.679-145.122 58.337-37.45-2.273-67.988-30.987-67.988-69.155 0-38.168 30.466-69.473 67.988-69.155z" fill="green"/>
  <path id="one" d="M82.904 32.625c21.258 0 40.251 9.946 52.722 25.508 9.542 11.907 15.266 27.102 15.266 43.647 0 38.168-30.465 69.155-67.988 69.155-37.524 0-67.988-30.987-67.988-69.155 0-38.168 30.464-69.155 67.988-69.155z" fill="green"/>
</svg>
!

CSS 

              
                body {
  margin: 0;
  background: grey;
}
svg {
  position:relative;
  display: block;
  float:left;
  width:400px;
  fill:#ccc;
}
#end1, #two {
  visibility:hidden;
}
!

JS 

              
                TweenMax.to("#start1", 1, {delay:.25, 
  morphSVG:{
    shape:"#end1", 
  }, repeat:9, yoyo:true, repeatDelay:1, ease: Back.easeOut.config(2.5)
});
TweenMax.to("#one", 1, {delay:.25, 
  morphSVG:{
    shape:"#two", 
  }, repeat:9, yoyo:true, repeatDelay:1, 
  ease: Bounce.easeOut
});
!
999px

Console