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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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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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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 class="shape shape1" xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 40 40">
    <path
       style="opacity:1;fill-opacity:1;stroke:none;"
       d="M 7.7423617,6.5524041 C 0.14213171,13.241204 -0.28352929,25.218399 6.5488487,32.446038 13.237649,40.04627 24.578354,40.568996 32.442483,33.639553 39.813699,26.434583 40.216105,14.96193 33.635997,7.7459191 26.935569,0.39795815 15.101951,-0.40029585 7.7423617,6.5524041 Z" />
    </svg>
<svg class="shape shape2" xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 40 40">
    <path
       style="opacity:1;fill-opacity:1;stroke:none;"
       d="M 7.7423617,6.5524041 C 0.14213171,13.241204 -0.28352929,25.218399 6.5488487,32.446038 13.237649,40.04627 24.578354,40.568996 32.442483,33.639553 39.813699,26.434583 40.216105,14.96193 33.635997,7.7459191 26.935569,0.39795815 15.101951,-0.40029585 7.7423617,6.5524041 Z" />
    </svg>
!

CSS 

              
                body {
  margin: 0;
}

.shape {
  display: block;
  fill: #2095F2;
  margin: 0 auto;
}

.shape1 {
  animation: rotate 1500ms infinite;
  margin-top: 50px;
}

.shape2 {
  animation: rotateScale 1500ms infinite;
  fill: #ccc;
  filter: blur(4px);
  margin-top: 10px;
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@keyframes rotateScale {
  0% {
    transform: scaleY(0.2) rotate(0deg);
  }
  100% {
    transform: scaleY(0.2) rotate(360deg);
  }
}
!

JS 

              
                var timeline = anime.timeline({
  autoplay: true,
  direction: "alternate",
  loop: true
});

timeline
  .add({
    targets: "path",
    d: {
      value: [
        "M 7.7423617,6.5524041 C 0.14213171,13.241204 -0.28352929,25.218399 6.5488487,32.446038 13.237649,40.04627 24.578354,40.568996 32.442483,33.639553 39.813699,26.434583 40.216105,14.96193 33.635997,7.7459191 26.935569,0.39795815 15.101951,-0.40029585 7.7423617,6.5524041 Z",
        "M 1.4639006,1.6816009 C 1.4129866,11.374999 1.1386316,31.038516 1.2037966,39.132841 10.361482,39.005187 29.91693,39.467197 38.833611,39.035804 39.621131,30.764045 38.910573,9.4542879 39.093715,1.2274189 30.247144,1.2462399 8.8125376,1.8724369 1.4639006,1.6816009 Z"
      ],
      duration: 1500,
      easing: "easeInOutQuad"
    },
    offset: 0
  })
  .add({
    targets: ".shape1",
    fill: {
      value: ["#2095F2", "#4BAF4F"],
      duration: 1500,
      easing: "easeInOutQuad"
    },
    offset: 0
  })
  .add({
    targets: "path",
    d: {
      value: [
        "M 1.4639006,1.6816009 C 1.4129866,11.374999 1.1386316,31.038516 1.2037966,39.132841 10.361482,39.005187 29.91693,39.467197 38.833611,39.035804 39.621131,30.764045 38.910573,9.4542879 39.093715,1.2274189 30.247144,1.2462399 8.8125376,1.8724369 1.4639006,1.6816009 Z",
        "M 19.499615,1.5030295 C 15.341558,11.017856 5.4243459,31.217087 1.2037966,39.132841 10.361482,39.005187 29.91693,39.467197 38.833611,39.035804 34.978274,30.942616 24.624859,11.418574 20.165144,1.5845618 18.73688,1.6665173 20.913606,1.4728946 19.499615,1.5030295 Z"
      ],
      duration: 1500,
      easing: "easeInOutQuad"
    },
    offset: 1500
  })
  .add({
    targets: ".shape1",
    fill: {
      value: ["#4BAF4F", "#F44236"],
      duration: 1500,
      easing: "easeInOutQuad"
    },
    offset: 1500
  })
  .add({
    targets: "path",
    d: {
      value: [
        "M 19.499615,1.5030295 C 15.341558,11.017856 5.4243459,31.217087 1.2037966,39.132841 10.361482,39.005187 29.91693,39.467197 38.833611,39.035804 34.978274,30.942616 24.624859,11.418574 20.165144,1.5845618 18.73688,1.6665173 20.913606,1.4728946 19.499615,1.5030295 Z",
        "M 7.7423617,6.5524041 C 0.14213171,13.241204 -0.28352929,25.218399 6.5488487,32.446038 13.237649,40.04627 24.578354,40.568996 32.442483,33.639553 39.813699,26.434583 40.216105,14.96193 33.635997,7.7459191 26.935569,0.39795815 15.101951,-0.40029585 7.7423617,6.5524041 Z"
      ],
      duration: 1500,
      easing: "easeInOutQuad"
    },
    offset: 3000
  })
  .add({
    targets: ".shape1",
    fill: {
      value: ["#F44236", "#2095F2"],
      duration: 1500,
      easing: "easeInOutQuad"
    },
    offset: 3000
  });
!
999px

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