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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).

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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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HTML 

              
                <!--Setup Symbols here -->
<svg class="symbol" >
  <symbol id="tablet" viewBox="-10 00 260 300" >
    <g >
      <path d="M202.986,317 L12.097,317 C5.462,317 0.083,311.623 0.083,304.99 L0.083,12.093 C0.083,5.46 5.461,0.083 12.097,0.083 L202.986,0.083 C209.622,0.083 215,5.46 215,12.093 L215,304.99 C215,311.623 209.622,317 202.986,317 Z" id="bezel-2" stroke-width="3" fill="#FDFDFD"></path>
      <rect id="screen" fill="#FFFFFF" x="17" y="32" width="181.999" height="252.917"></rect>
      <circle id="lock" cx="108.021" cy="300.021" r="8.021"></circle>
      <circle id="camera" cx="106.99" cy="16.99" r="2.99"></circle>
    </g>
  </symbol>   
</svg>

<svg class="symbol">
  <symbol id="chevron" viewBox="0 0 100 60" >
    <line class='line line--1' x1="50" y1="50" x2="10" y2="10" stroke-width="10" stroke-linecap="round"></line>
    <line class='line line--1' x1="50" y1="50" x2="90" y2="10" stroke-width="10" stroke-linecap="round"></line>
  </symbol>
</svg>

<svg class="symbol blue--line-1 red--line-2">
  <symbol id="color-chevron" viewBox="0 0 100 60" >
    <line class='line line--1' x1="50" y1="50" x2="10" y2="10" stroke-width="10" stroke-linecap="round"></line>
    <line class='line line--2' x1="50" y1="50" x2="90" y2="10" stroke-width="10" stroke-linecap="round"></line>
  </symbol>
</svg>
<svg class="symbol brown--line-1 green--line-2">
  <symbol id="color-chevron2" viewBox="0 0 100 60" >
    <line class='line line--1' x1="50" y1="50" x2="10" y2="10" stroke-width="10" stroke-linecap="round"></line>
    <line class='line line--2' x1="50" y1="50" x2="90" y2="10" stroke-width="10" stroke-linecap="round"></line>
  </symbol>
</svg>

<svg class="symbol">
  <symbol class="blue--line-1 red--line-2" id="color-chevron3" viewBox="0 0 100 60" >
    <line class='line line--1' x1="50" y1="50" x2="10" y2="10" stroke-width="10" stroke-linecap="round"></line>
    <line class='line line--2' x1="50" y1="50" x2="90" y2="10" stroke-width="10" stroke-linecap="round"></line>
  </symbol>
</svg>
<svg class="symbol">
  <symbol class="brown--line-1 green--line-2" id="color-chevron4" viewBox="0 0 100 60" >
    <line class='line line--1' x1="50" y1="50" x2="10" y2="10" stroke-width="10" stroke-linecap="round"></line>
    <line class='line line--2' x1="50" y1="50" x2="90" y2="10" stroke-width="10" stroke-linecap="round"></line>
  </symbol>
</svg>

<svg class="symbol ">
  <symbol class="css-props" id="props-chevron" viewBox="0 0 100 60" >
    <line class='line line--1' x1="50" y1="50" x2="10" y2="10" stroke-width="10" stroke-linecap="round"></line>
    <line class='line line--2' x1="50" y1="50" x2="90" y2="10" stroke-width="10" stroke-linecap="round"></line>
  </symbol>
</svg>





<!--  Re-Use Symbols here -->
<!-- xlink required for safari -->

<h2>SVG w/ Single Style</h2>
<h3>Reuse (w/ only <code>href</code>)</h3>
  <p><em>Works in Chrome, Edge 14+, IE11, Friefox, Opera (Not Safari)</em></p>
<div>
  <svg stroke="red" width="50" height="75" ><use href="#tablet" /></svg>
  <svg stroke="green" width="50" height="75" ><use href="#tablet" /></svg>
  <span class="icon--blue"><svg width="50" height="75"><use href="#tablet"></use></svg></span>
</div>

<h3>Reuse (w/ <code>xlink:href</code>)</h3>
<p><em>Works in all browsers</em></p>
<svg stroke='red' fill='darkgrey' width="50" height="75">
    <use xlink:href="#tablet" />
</svg>

<svg fill='darkgrey' stroke='green' width="50" height="75">
    <use xlink:href="#tablet" />
</svg>

<svg class="icon icon--blue" width="50" height="75">
    <use xlink:href="#tablet" />
</svg>






<h2>SVGs w/ multiple styles</h2>

<h3>Multiple <code>Symbol</code> tags (w/ class on <code>SVG</code>)</h3>
<p><em>Works in Chrome, Edge 14+, IE11, Opera, safari (not in Firefox)</em></p>
<div>
    <svg width="4em" height="40px" ><use xlink:href="#color-chevron2"></use></svg>
    <svg width="4em" height="40px"><use xlink:href="#color-chevron"></use></svg>
</div>

<h3>Multiple <code>Symbol</code> tags (w/ class on <code>symbol</code>)</h3>
<p><em>Works in all browsers</em></p>
<div>
    <svg width="4em" height="40px" ><use xlink:href="#color-chevron3"></use></svg>
    <svg width="4em" height="40px"><use xlink:href="#color-chevron4"></use></svg>
</div>

<h2>SVGs w/ multiple styles + Custom Props</h2>
<h3>Single <code>symbol</code> Styled using CSS custom properties</h3>
  <p><em>Works in All Browsers (which support custom props i.e. Chrome, Edge 16+, Opera, Firefox, Safari; not IE or Edge 14/15)</em></p>
  <div>
    <svg width="4em" height="40px"><use xlink:href="#props-chevron"></use></svg>
    <svg class='reuse-props' width="4em" height="40px"><use xlink:href="#props-chevron"></use></svg>
  </div>
  
  
  
  
  <h2>Resizing SVGs symbols</h2>
  <p><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1415155">https://bugzilla.mozilla.org/show_bug.cgi?id=1415155</a></p>
  <p>Firefox is the only browser to correctly respect the symbol size</p>
  <p><em>Size matches outer SVG in Chrome, Safari, Edge 14+, IE Opera</em></p>
  <span><svg width="82px" height="16px" class="sr-only"><symbol id="star" version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 64 512 512" width="150" height="150" class="icon"><path transform="scale(1, -1) translate(0, -512)" d="M342 147q-8 -5 -5 -14l46 -140l-120 87q-7 5 -14 0l-120 -87l46 140q3 9 -5 14l-119 87h147q10 0 12 9l46 140l46 -140q2 -9 11 -9h148zM499 259h-176l-55 168q-3 9 -12 9t-12 -9l-55 -168h-176q-10 0 -12.5 -8.5t4.5 -13.5l143 -104l-54 -169q-3 -8 4 -13.5t15 -0.5 l143 104l143 -104q3 -2 7 -2t8 2q7 6 4 14l-54 169l143 104q7 5 4 13.5t-12 8.5v0z"></path></symbol></svg><svg width="82px" height="16px"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#star"></use></svg></span>
  
  
  
  
  <h2>SVG Reuse w/ Linear Gradients</h2>
  <p><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1415180">https://bugzilla.mozilla.org/show_bug.cgi?id=1415180</a></p>
  <p><em>Gradient should show. Works in Chrome, Safari, Edge 14+, IE Opera (not in Firefox)</em></p>
  
<svg width="35" height="20" class="sr-only">
  <symbol id="fast-track" version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 587.1 287.3" class="icon icon--fast-track">
    <style type="text/css">
      .fast-track-icon__gradient{fill:url(#fast-track-icon__gradient);}
    </style>
    <g>
  <linearGradient id="fast-track-icon__gradient" gradientUnits="userSpaceOnUse" x1="460.6738" y1="285.375" x2="460.6738" y2="1.9141" gradientTransform="matrix(1 0 -0.3719 1 -119.0996 0)"><stop offset="0" style="stop-color:#751A02"></stop><stop offset="2.873510e-002" style="stop-color:#891D08"></stop><stop offset="7.119306e-002" style="stop-color:#9F210F"></stop><stop offset="0.1214" style="stop-color:#B02414"></stop><stop offset="0.1834" style="stop-color:#BB2617"></stop><stop offset="0.2705" style="stop-color:#C22819"></stop><stop offset="0.5123" style="stop-color:#C4281A"></stop><stop offset="0.7425" style="stop-color:#C22819"></stop><stop offset="0.8254" style="stop-color:#BB2617"></stop><stop offset="0.8845" style="stop-color:#B02414"></stop><stop offset="0.9322" style="stop-color:#9F210F"></stop><stop offset="0.9726" style="stop-color:#891D08"></stop><stop offset="1" style="stop-color:#751A02"></stop></linearGradient>
    
  </g>
    <g><path class="fast-track-icon__gradient" d="M292,68.4h43l-5.2,133.8h-37.5l9-91l-52,91h-39.1L292,68.4z M372.4,68.4L375,1.9h-33.5l-6.6,66.4H372.4z M292,68.4l37.9-66.4h-36.4l-40.6,66.4H292z M249.3,202.1l-50.9,83.2h37.1l23.1-40.5l-4,40.5H289l3.3-83.2H249.3z"></path>
      <path d="M190.9,59.2h40.4L214.1,87h-33.4l-18.1,48.7H130L179.8,1.9h88L249,29.6h-46.9L190.9,59.2z"></path>
      <path class="fast-track-icon__text" d="M475.6,46.8l-1.4,3.8h-32.5l1.4-3.8c5-13.6,1-19.1-8.4-19.1c-9.4,0-14.3,4.8-16.4,10.5 c-8.9,23.5,58,9.6,39.4,59.2c-9.5,25.8-35.7,40.1-62.8,40.1c-27.1,0-43-13.4-30.5-46.8l0.7-1.9h32.5l-0.7,1.9 c-5.1,13.6-0.3,19.1,9.1,19.1c9.4,0,15.8-3.6,18.4-10.5c8.6-23.1-57.4-10.9-39.4-59.2C394.6,14.3,418,0,445.2,0 C472.3,0,488,13.4,475.6,46.8z"></path>
      <path d="M72.1,179.3L32.5,285.4H0l39.5-106.1H13.1l10.4-27.7H111l-17.4,27.7H72.1z"></path>
      <path d="M173.8,151.6c27.1,0,40.4,10.5,31.5,34.4l-3.7,9.6c-4.7,12.6-13.9,22.4-28,27.1c6.3,4.6,8.2,13.2,5,27.3 l-7.6,35.4h-32.4l7.4-32.7c2.8-12.4-0.6-15.1-9.3-15.1h-12.1l-17.9,47.8H74.3l49.8-133.8H173.8z M146.2,179.3L135,209.9h17.2 c8.5,0,13.8-5.5,16.7-13.4l1.4-3.8c2.9-7.8,1.7-13.4-6.8-13.4H146.2z"></path>
      <path d="M437.4,196.5l-33.9,3.8l1.4-3.8c5-13.6,1-19.1-8.4-19.1c-9.4,0-17.4,5.5-22.4,19.1l-16.3,44 c-5.1,13.6-1.2,19.1,8.2,19.1c9.4,0,17.4-5.5,22.6-19.1l0.7-1.9h32.5l-0.7,1.9c-12.5,33.4-38.2,46.8-65.3,46.8 c-27.1,0-42.6-14.3-30.2-47.8l15.6-42c12.5-33.4,38.7-47.8,65.8-47.8C434,149.7,449.7,163.1,437.4,196.5z"></path>
      <path d="M528.9,285.4h-39.2l-15-58.7l-21.7,58.7h-32.5l49.8-133.8h32.5l-21.3,57.1l58-57.1h37.4l-68.3,64.2 L528.9,285.4z"></path>
      <path class="fast-track-icon__text" d="M548.1,29.6l-39.5,106.1h-32.5l39.5-106.1h-26.4l10.4-27.7h87.5l-17.4,27.7H548.1z"></path>
        </symbol></svg>
  <svg width="35" height="20"><use xlink:href="#fast-track"></use></svg>

  
  <p><em>Moving the Gradient outside the <code>symbol</code>. Works in all browsers</em></p>
  
  <div>
    <svg width="35" height="20" class="sr-only">
     <defs>
       <linearGradient id="id-outside-symbol" gradientUnits="userSpaceOnUse" x1="460.6738" y1="285.375" x2="460.6738" y2="1.9141" gradientTransform="matrix(1 0 -0.3719 1 -119.0996 0)"><stop offset="0" style="stop-color:#751A02"></stop><stop offset="2.873510e-002" style="stop-color:#891D08"></stop><stop offset="7.119306e-002" style="stop-color:#9F210F"></stop><stop offset="0.1214" style="stop-color:#B02414"></stop><stop offset="0.1834" style="stop-color:#BB2617"></stop><stop offset="0.2705" style="stop-color:#C22819"></stop><stop offset="0.5123" style="stop-color:#C4281A"></stop><stop offset="0.7425" style="stop-color:#C22819"></stop><stop offset="0.8254" style="stop-color:#BB2617"></stop><stop offset="0.8845" style="stop-color:#B02414"></stop><stop offset="0.9322" style="stop-color:#9F210F"></stop><stop offset="0.9726" style="stop-color:#891D08"></stop><stop offset="1" style="stop-color:#751A02"></stop></linearGradient>
       
     </defs>
      <symbol id='fast-track-outside' viewBox="0 0 587.1 287.3">
        <style type="text/css">
          .id-outside-symbol{fill:url(#id-outside-symbol);}
        </style>
        <g><path class="id-outside-symbol" d="M292,68.4h43l-5.2,133.8h-37.5l9-91l-52,91h-39.1L292,68.4z M372.4,68.4L375,1.9h-33.5l-6.6,66.4H372.4z M292,68.4l37.9-66.4h-36.4l-40.6,66.4H292z M249.3,202.1l-50.9,83.2h37.1l23.1-40.5l-4,40.5H289l3.3-83.2H249.3z"></path>
          <path  d="M190.9,59.2h40.4L214.1,87h-33.4l-18.1,48.7H130L179.8,1.9h88L249,29.6h-46.9L190.9,59.2z"></path>
          <path d="M475.6,46.8l-1.4,3.8h-32.5l1.4-3.8c5-13.6,1-19.1-8.4-19.1c-9.4,0-14.3,4.8-16.4,10.5 c-8.9,23.5,58,9.6,39.4,59.2c-9.5,25.8-35.7,40.1-62.8,40.1c-27.1,0-43-13.4-30.5-46.8l0.7-1.9h32.5l-0.7,1.9 c-5.1,13.6-0.3,19.1,9.1,19.1c9.4,0,15.8-3.6,18.4-10.5c8.6-23.1-57.4-10.9-39.4-59.2C394.6,14.3,418,0,445.2,0 C472.3,0,488,13.4,475.6,46.8z"></path>
          <path d="M72.1,179.3L32.5,285.4H0l39.5-106.1H13.1l10.4-27.7H111l-17.4,27.7H72.1z"></path>
          <path d="M173.8,151.6c27.1,0,40.4,10.5,31.5,34.4l-3.7,9.6c-4.7,12.6-13.9,22.4-28,27.1c6.3,4.6,8.2,13.2,5,27.3 l-7.6,35.4h-32.4l7.4-32.7c2.8-12.4-0.6-15.1-9.3-15.1h-12.1l-17.9,47.8H74.3l49.8-133.8H173.8z M146.2,179.3L135,209.9h17.2 c8.5,0,13.8-5.5,16.7-13.4l1.4-3.8c2.9-7.8,1.7-13.4-6.8-13.4H146.2z"></path>
          <path d="M437.4,196.5l-33.9,3.8l1.4-3.8c5-13.6,1-19.1-8.4-19.1c-9.4,0-17.4,5.5-22.4,19.1l-16.3,44 c-5.1,13.6-1.2,19.1,8.2,19.1c9.4,0,17.4-5.5,22.6-19.1l0.7-1.9h32.5l-0.7,1.9c-12.5,33.4-38.2,46.8-65.3,46.8 c-27.1,0-42.6-14.3-30.2-47.8l15.6-42c12.5-33.4,38.7-47.8,65.8-47.8C434,149.7,449.7,163.1,437.4,196.5z"></path>
          <path d="M528.9,285.4h-39.2l-15-58.7l-21.7,58.7h-32.5l49.8-133.8h32.5l-21.3,57.1l58-57.1h37.4l-68.3,64.2 L528.9,285.4z"></path>
          <path d="M548.1,29.6l-39.5,106.1h-32.5l39.5-106.1h-26.4l10.4-27.7h87.5l-17.4,27.7H548.1z"></path>
            
          </symbol>
        </svg>
      <svg width="35" height="20"><use xlink:href="#fast-track-outside"></use>
      </svg>

      </span>
!

CSS 

              
                  .symbol { display: none; }
  .icon--blue {
    stroke:blue;
    fill:darkgrey;
  }
  .blue--line-1 .line--1 {
    stroke:blue;
  }
  .red--line-2 .line--2 {
    stroke:red;
  }
  .brown--line-1 .line--1 {
    stroke:brown;
  }
  .green--line-2 .line--2 {
    stroke:green;
  }

:root {
  --line-1: brown;
  --line-2: green;
}
.css-props .line--1 {
    stroke: var(--line-1);
}
.css-props .line--2 {
    stroke: var(--line-2);
}
.reuse-props {
  --line-1: red;
  --line-2: blue;  
}
!

JS
!
999px

Console