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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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <form id="transforms">
  <p style="text-align:left">Try stacking transforms by clicking "apply transform" and then add another.</p>
  <select id="transforms-select">
    <option data-transform="translate">translate (x [y])</option>
    <option data-transform="scale">scale (x [y])</option>
    <option data-transform="rotate">rotate (a [x y])</option>
    <option data-transform="skewX">skewX (a)</option>
    <option data-transform="skewY">skewY (a)</option>
    <!--
    <option data-transform="matrix">matrix</option>
    -->
  </select>
  <br><br>
  <div class="translate-field" data-transform="translate">
    x: <input type=range min=-500 max=500 value=0>
    y: <input type=range min=-500 max=500 value=0>
  </div>
  <div class="translate-field" data-transform="scale">
    x: <input type=range min=-5.0 max=5.0 value=1.0 step="0.1">
    y: <input type=range min=-5.0 max=5.0 value=1.0 step="0.1">
  </div>
  <div class="translate-field" data-transform="skewX">
    a: <input type=range min=-100 max=100 value=1>
  </div>
  <div class="translate-field" data-transform="skewY">
    a: <input type=range min=-100 max=100 value=1>
  </div>
  <div class="translate-field" data-transform="rotate">
    a: <input type=range min=-360 max=360 value=0>
    x: <input type=range min=-500 max=1000 value=500>
    y: <input type=range min=-500 max=1000 value=500>
  </div>
  <br>
  <button>apply transform</button>
  <br><br>
  <div id="results">result: </div>
</form>
<svg xmlns="http://www.w3.org/2000/svg">
  <title>HTML5 Logo</title>
  <g id="apply-transforms">
    <polygon fill="#E44D26" points="107.644,470.877 74.633,100.62 437.367,100.62 404.321,470.819 255.778,512 			"/>
    <polygon fill="#F16529" points="256,480.523 376.03,447.246 404.27,130.894 256,130.894 			"/>
    <polygon fill="#EBEBEB" points="256,268.217 195.91,268.217 191.76,221.716 256,221.716 256,176.305 255.843,176.305 142.132,176.305 143.219,188.488 154.38,313.627 256,313.627"/>
    <polygon fill="#EBEBEB" points="256,386.153 255.801,386.206 205.227,372.55 201.994,336.333 177.419,336.333 156.409,336.333 162.771,407.634 255.791,433.457 256,433.399"/>
    <path d="M108.382,0h23.077v22.8h21.11V0h23.078v69.044H152.57v-23.12h-21.11v23.12h-23.077V0z"/>
    <path d="M205.994,22.896h-20.316V0h63.72v22.896h-20.325v46.148h-23.078V22.896z"/>
    <path d="M259.511,0h24.063l14.802,24.26L313.163,0h24.072v69.044h-22.982V34.822l-15.877,24.549h-0.397l-15.888-24.549v34.222h-22.58V0z"/>
    <path d="M348.72,0h23.084v46.222h32.453v22.822H348.72V0z"/>
    <polygon fill="#FFFFFF" points="255.843,268.217 255.843,313.627 311.761,313.627 306.49,372.521 255.843,386.191 255.843,433.435 348.937,407.634 349.62,399.962 360.291,280.411 361.399,268.217 349.162,268.217"/>
    <polygon fill="#FFFFFF" points="255.843,176.305 255.843,204.509 255.843,221.605 255.843,221.716 365.385,221.716 365.385,221.716 365.531,221.716 366.442,211.509 368.511,188.488 369.597,176.305"/>
  </g>
</svg>
!

CSS 

              
                svg {
  position: absolute;
  top:0;
  bottom:0;
  left:0;
  right:0;
  z-index: -1;
  width: 100%;
  height: 100%;
}

form {
  position: absolute;
  right: 10%;
  top: 10%;
  z-index: 9999999;
  text-align: right;
  background: rgba(255, 255, 255, 0.7);
  border: 3px solid #ddd;
  padding: 0 20px 20px;
  width: 50%;
  min-width: 500px;
}

form,
form select,
form input {
  font-size: 18px;
}
!

JS 

              
                var $fields = $('.translate-field').hide(),
    $results = $("#results"),
    $applyTransforms = $("#apply-transforms"),
    selectedTransform,
    transforms = [],
    result = '';

$fields.first().show();
selectedTransform = $fields.first().data('transform');

$("#transforms-select").on("change", function(){
  $fields.hide();
  selectedTransform = $(this).find(":selected").data('transform');
  $('.translate-field[data-transform="' + selectedTransform + '"]').show();
});

$(".translate-field").on("change", function(){
  var copyTransforms = transforms.slice(0);
  
  copyTransforms.push( getNewTransform() );
  
  renderTransforms(copyTransforms);
});

$("#transforms").on("submit", function(e){
  transforms.push( getNewTransform() );
  
  renderTransforms(transforms);
  
  return false;
});

function getNewTransform() {
  var transformVal = $.map($('input:visible'), function(input){ 
    return $(input).val();
  }).join(' ');
  
  return selectedTransform + '(' + transformVal + ')';
}

function renderTransforms(t) {
  $applyTransforms.attr('transform', t.join(' '));
  $results.text('result: ' + t.join(' '));
}
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999px

Console