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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-.

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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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 Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                <svg viewBox="0 0 600 300" class="svg-defs">
  <!-- Symbol wth text -->
  <symbol id="s-text">
    <text text-anchor="middle"
          x="50%"
          y="50%"
          dy=".35em"
          class="text"
          >
      Love
    </text>    
  </symbol>

  <!-- Mask with text -->
  <mask id="m-text"
        maskunits="userSpaceOnUse"
        maskcontentunits="userSpaceOnUse">
    <rect
          width="100%"
          height="100%"
          class="mask__shape">
    </rect>
    <use xlink:href="#s-text"
         class="text-mask"
         ></use>
  </mask>
</svg>

<div class="box-with-text">
  <!-- Content for text -->
  <div class="text-fill">
    <!-- Element with animated shadows -->
    <div class="shadows"></div>
  </div>

  <!-- SVG to cover text fill -->
  <svg viewBox="0 0 600 300"
       class="svg-inverted-mask">
    <!-- Big shape with hole in form of text -->
    <rect
          width="100%"
          height="100%"
          mask="url(#m-text)"
          class="shape--fill"/>
    <!-- Transparent copy of text to keep
         patterned text selectable -->
    <use xlink:href="#s-text"
         class="text--transparent"
         ></use>
  </svg> 
</div
!

CSS 

              
                @import url(http://fonts.googleapis.com/css?family=Open+Sans:800);

.svg-inverted-mask {
  position: absolute;
  width: 100%;
  height: 100%;
}

.mask__shape {
  fill: white;
}

.box-with-text {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.text-fill {
  position: absolute;
  top: 50%;
  left: 50%;
  padding-top: 35vw;
  padding-left: 100%;
  margin: auto;
  overflow: hidden;
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.shape--fill {
  fill: lightgoldenrodyellow;
}

/* Transparent copy of text to keep patterned text selectable */
.text--transparent {
  fill: transparent;
}

/* Element with animated shadows */
.shadows {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1vmax;
  height: 1vmax;
  background: gold;
  border-radius: 50%;
  box-shadow: 0 0 0 2vmax purple, 0 0 0 4vmax crimson, 0 0 0 6vmax red, 0 0 0 8vmax orangered, 0 0 0 10vmax tomato, 0 0 0 12vmax gold, 0 0 0 14vmax yellow, 0 0 0 16vmax yellowgreen, 0 0 0 18vmax turquoise, 0 0 0 20vmax royalblue, 0 0 0 22vmax mediumslateblue, 0 0 0 24vmax mediumorchid, 0 0 0 26vmax purple, 0 0 0 28vmax crimson, 0 0 0 30vmax red, 0 0 0 32vmax orangered, 0 0 0 34vmax tomato, 0 0 0 36vmax gold, 0 0 0 38vmax yellow, 0 0 0 40vmax yellowgreen, 0 0 0 42vmax turquoise, 0 0 0 44vmax royalblue, 0 0 0 46vmax mediumslateblue, 0 0 0 48vmax mediumorchid, 0 0 0 50vmax darkviolet, 0 0 0 52vmax purple, 0 0 0 54vmax crimson, 0 0 0 56vmax red, 0 0 0 58vmax orangered, 0 0 0 60vmax tomato, 0 0 0 62vmax gold, 0 0 0 64vmax yellow, 0 0 0 66vmax yellowgreen, 0 0 0 68vmax turquoise, 0 0 0 70vmax royalblue, 0 0 0 72vmax mediumslateblue, 0 0 0 74vmax mediumorchid, 0 0 0 76vmax darkviolet, 0 0 0 78vmax purple, 0 0 0 80vmax crimson, 0 0 0 82vmax red, 0 0 0 84vmax orangered, 0 0 0 86vmax tomato, 0 0 0 88vmax gold, 0 0 0 90vmax yellow;
  -webkit-animation: shadows-move 4s linear infinite;
  animation: shadows-move 4s linear infinite;
}

@media (min-aspect-ratio: 1 / 2) {
  .text-fill {
    padding-top: 35vw;
  }
}

@media (min-aspect-ratio: 2 / 1) {
  .text-fill {
    padding-top: 70vh;
    padding-left: 190vh;
  }
}

@-webkit-keyframes shadows-move {
  25% {
    box-shadow: 0 0 0 2vmax royalblue, 0 0 0 4vmax mediumslateblue, 0 0 0 6vmax mediumorchid, 0 0 0 8vmax purple, 0 0 0 10vmax crimson, 0 0 0 12vmax red, 0 0 0 14vmax orangered, 0 0 0 16vmax tomato, 0 0 0 18vmax gold, 0 0 0 20vmax yellow, 0 0 0 22vmax yellowgreen, 0 0 0 24vmax turquoise, 0 0 0 26vmax royalblue, 0 0 0 28vmax mediumslateblue, 0 0 0 30vmax mediumorchid, 0 0 0 32vmax darkviolet, 0 0 0 34vmax purple, 0 0 0 36vmax crimson, 0 0 0 38vmax red, 0 0 0 40vmax orangered, 0 0 0 42vmax tomato, 0 0 0 44vmax gold, 0 0 0 46vmax yellow, 0 0 0 48vmax yellowgreen, 0 0 0 50vmax turquoise, 0 0 0 52vmax royalblue, 0 0 0 54vmax mediumslateblue, 0 0 0 56vmax mediumorchid, 0 0 0 58vmax darkviolet, 0 0 0 60vmax purple, 0 0 0 62vmax crimson, 0 0 0 64vmax red, 0 0 0 66vmax orangered, 0 0 0 68vmax tomato, 0 0 0 70vmax gold, 0 0 0 72vmax yellow, 0 0 0 74vmax yellowgreen, 0 0 0 76vmax turquoise, 0 0 0 78vmax royalblue, 0 0 0 80vmax mediumslateblue, 0 0 0 82vmax mediumorchid, 0 0 0 84vmax darkviolet, 0 0 0 86vmax purple, 0 0 0 88vmax crimson, 0 0 0 90vmax red;
  }
  45% {
    box-shadow: 0 0 0 2vmax yellow, 0 0 0 4vmax yellowgreen, 0 0 0 6vmax turquoise, 0 0 0 8vmax royalblue, 0 0 0 10vmax mediumslateblue, 0 0 0 12vmax mediumorchid, 0 0 0 14vmax purple, 0 0 0 16vmax crimson, 0 0 0 18vmax red, 0 0 0 20vmax orangered, 0 0 0 22vmax tomato, 0 0 0 24vmax gold, 0 0 0 26vmax yellow, 0 0 0 28vmax yellowgreen, 0 0 0 30vmax turquoise, 0 0 0 32vmax royalblue, 0 0 0 34vmax mediumslateblue, 0 0 0 36vmax mediumorchid, 0 0 0 38vmax darkviolet, 0 0 0 40vmax purple, 0 0 0 42vmax crimson, 0 0 0 44vmax red, 0 0 0 46vmax orangered, 0 0 0 48vmax tomato, 0 0 0 50vmax gold, 0 0 0 52vmax yellow, 0 0 0 54vmax yellowgreen, 0 0 0 56vmax turquoise, 0 0 0 58vmax royalblue, 0 0 0 60vmax mediumslateblue, 0 0 0 62vmax mediumorchid, 0 0 0 64vmax darkviolet, 0 0 0 66vmax purple, 0 0 0 68vmax crimson, 0 0 0 70vmax red, 0 0 0 72vmax orangered, 0 0 0 74vmax tomato, 0 0 0 76vmax gold, 0 0 0 78vmax yellow, 0 0 0 80vmax yellowgreen, 0 0 0 82vmax turquoise, 0 0 0 84vmax royalblue, 0 0 0 86vmax mediumslateblue, 0 0 0 88vmax mediumorchid, 0 0 0 90vmax darkviolet;
  }
  75% {
    box-shadow: 0 0 0 2vmax orangered, 0 0 0 4vmax tomato, 0 0 0 6vmax gold, 0 0 0 8vmax yellow, 0 0 0 10vmax yellowgreen, 0 0 0 12vmax turquoise, 0 0 0 14vmax royalblue, 0 0 0 16vmax mediumslateblue, 0 0 0 18vmax mediumorchid, 0 0 0 20vmax purple, 0 0 0 22vmax crimson, 0 0 0 24vmax red, 0 0 0 26vmax orangered, 0 0 0 28vmax tomato, 0 0 0 30vmax gold, 0 0 0 32vmax yellow, 0 0 0 34vmax yellowgreen, 0 0 0 36vmax turquoise, 0 0 0 38vmax royalblue, 0 0 0 40vmax mediumslateblue, 0 0 0 42vmax mediumorchid, 0 0 0 44vmax darkviolet, 0 0 0 46vmax purple, 0 0 0 48vmax crimson, 0 0 0 50vmax red, 0 0 0 52vmax orangered, 0 0 0 54vmax tomato, 0 0 0 56vmax gold, 0 0 0 58vmax yellow, 0 0 0 60vmax yellowgreen, 0 0 0 62vmax turquoise, 0 0 0 64vmax royalblue, 0 0 0 66vmax mediumslateblue, 0 0 0 68vmax mediumorchid, 0 0 0 70vmax darkviolet, 0 0 0 72vmax purple, 0 0 0 74vmax crimson, 0 0 0 76vmax red, 0 0 0 78vmax orangered, 0 0 0 80vmax tomato, 0 0 0 82vmax gold, 0 0 0 84vmax yellow, 0 0 0 86vmax yellowgreen, 0 0 0 88vmax turquoise, 0 0 0 90vmax royalblue;
  }
}
@keyframes shadows-move {
  25% {
    box-shadow: 0 0 0 2vmax royalblue, 0 0 0 4vmax mediumslateblue, 0 0 0 6vmax mediumorchid, 0 0 0 8vmax purple, 0 0 0 10vmax crimson, 0 0 0 12vmax red, 0 0 0 14vmax orangered, 0 0 0 16vmax tomato, 0 0 0 18vmax gold, 0 0 0 20vmax yellow, 0 0 0 22vmax yellowgreen, 0 0 0 24vmax turquoise, 0 0 0 26vmax royalblue, 0 0 0 28vmax mediumslateblue, 0 0 0 30vmax mediumorchid, 0 0 0 32vmax darkviolet, 0 0 0 34vmax purple, 0 0 0 36vmax crimson, 0 0 0 38vmax red, 0 0 0 40vmax orangered, 0 0 0 42vmax tomato, 0 0 0 44vmax gold, 0 0 0 46vmax yellow, 0 0 0 48vmax yellowgreen, 0 0 0 50vmax turquoise, 0 0 0 52vmax royalblue, 0 0 0 54vmax mediumslateblue, 0 0 0 56vmax mediumorchid, 0 0 0 58vmax darkviolet, 0 0 0 60vmax purple, 0 0 0 62vmax crimson, 0 0 0 64vmax red, 0 0 0 66vmax orangered, 0 0 0 68vmax tomato, 0 0 0 70vmax gold, 0 0 0 72vmax yellow, 0 0 0 74vmax yellowgreen, 0 0 0 76vmax turquoise, 0 0 0 78vmax royalblue, 0 0 0 80vmax mediumslateblue, 0 0 0 82vmax mediumorchid, 0 0 0 84vmax darkviolet, 0 0 0 86vmax purple, 0 0 0 88vmax crimson, 0 0 0 90vmax red;
  }
  45% {
    box-shadow: 0 0 0 2vmax yellow, 0 0 0 4vmax yellowgreen, 0 0 0 6vmax turquoise, 0 0 0 8vmax royalblue, 0 0 0 10vmax mediumslateblue, 0 0 0 12vmax mediumorchid, 0 0 0 14vmax purple, 0 0 0 16vmax crimson, 0 0 0 18vmax red, 0 0 0 20vmax orangered, 0 0 0 22vmax tomato, 0 0 0 24vmax gold, 0 0 0 26vmax yellow, 0 0 0 28vmax yellowgreen, 0 0 0 30vmax turquoise, 0 0 0 32vmax royalblue, 0 0 0 34vmax mediumslateblue, 0 0 0 36vmax mediumorchid, 0 0 0 38vmax darkviolet, 0 0 0 40vmax purple, 0 0 0 42vmax crimson, 0 0 0 44vmax red, 0 0 0 46vmax orangered, 0 0 0 48vmax tomato, 0 0 0 50vmax gold, 0 0 0 52vmax yellow, 0 0 0 54vmax yellowgreen, 0 0 0 56vmax turquoise, 0 0 0 58vmax royalblue, 0 0 0 60vmax mediumslateblue, 0 0 0 62vmax mediumorchid, 0 0 0 64vmax darkviolet, 0 0 0 66vmax purple, 0 0 0 68vmax crimson, 0 0 0 70vmax red, 0 0 0 72vmax orangered, 0 0 0 74vmax tomato, 0 0 0 76vmax gold, 0 0 0 78vmax yellow, 0 0 0 80vmax yellowgreen, 0 0 0 82vmax turquoise, 0 0 0 84vmax royalblue, 0 0 0 86vmax mediumslateblue, 0 0 0 88vmax mediumorchid, 0 0 0 90vmax darkviolet;
  }
  75% {
    box-shadow: 0 0 0 2vmax orangered, 0 0 0 4vmax tomato, 0 0 0 6vmax gold, 0 0 0 8vmax yellow, 0 0 0 10vmax yellowgreen, 0 0 0 12vmax turquoise, 0 0 0 14vmax royalblue, 0 0 0 16vmax mediumslateblue, 0 0 0 18vmax mediumorchid, 0 0 0 20vmax purple, 0 0 0 22vmax crimson, 0 0 0 24vmax red, 0 0 0 26vmax orangered, 0 0 0 28vmax tomato, 0 0 0 30vmax gold, 0 0 0 32vmax yellow, 0 0 0 34vmax yellowgreen, 0 0 0 36vmax turquoise, 0 0 0 38vmax royalblue, 0 0 0 40vmax mediumslateblue, 0 0 0 42vmax mediumorchid, 0 0 0 44vmax darkviolet, 0 0 0 46vmax purple, 0 0 0 48vmax crimson, 0 0 0 50vmax red, 0 0 0 52vmax orangered, 0 0 0 54vmax tomato, 0 0 0 56vmax gold, 0 0 0 58vmax yellow, 0 0 0 60vmax yellowgreen, 0 0 0 62vmax turquoise, 0 0 0 64vmax royalblue, 0 0 0 66vmax mediumslateblue, 0 0 0 68vmax mediumorchid, 0 0 0 70vmax darkviolet, 0 0 0 72vmax purple, 0 0 0 74vmax crimson, 0 0 0 76vmax red, 0 0 0 78vmax orangered, 0 0 0 80vmax tomato, 0 0 0 82vmax gold, 0 0 0 84vmax yellow, 0 0 0 86vmax yellowgreen, 0 0 0 88vmax turquoise, 0 0 0 90vmax royalblue;
  }
}

/* Other styles */
html, body {
  height: 100%;
}

body {
  background: #fafad2;
  font: 14.5em/1 Open Sans, Impact;
  text-transform: uppercase;
  margin: 0;
}

.svg-defs {
  width: 0;
  height: 0;
}
!

JS
!
999px

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