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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

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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-.

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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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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

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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.

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

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HTML 

              
                <svg>
  <path id="blob" d="M70.3,103.2c0,0-7.5-58.4,42.9-48.4s43.5,74.5,72,37.9s49.7-72,67.1-36s83.9,92.5,14.3,96.3c-69.6,3.7-82,18-88.8,44.1c-6.8,26.1-93.8,29.8-91.3-18S75.3,134.9,70.3,103.2z" />
</svg>
<svg>  
  <polygon id="star" points="263.6,115.5 182.9,103.3 149.9,30.2 116.5,102.9 35.8,115.1 92.6,172.3 80.2,248.6 149.9,215.3 219.1,248.6 207.7,171.4"/>
</svg>
!

CSS 

              
                body {
  background: #333;
}

svg {
  display: block;
  height: 280px;
  width: 650px;
}

#star {
  fill: yellowgreen;
  stroke: #1a1a1a;
  stroke-width: 1;
}

#blob {
  fill: #1a1a1a;
  stroke: orange;
  stroke-width: 4;
}
!

JS 

              
                
TweenLite.defaultEase = Power0.easeNone;

var blob = document.getElementById("blob");
var star = document.getElementById("star");

var path1 = blob.getAttribute("d");
var path2 = "M39.9,110.7c0,0,18.6-42.2,68.9-32.3s38.5,11.9,67.1-24.7s44.7,9.8,62.1,45.9s39.1,77-30.4,80.7c-69.6,3.7,19.9,26.1,13,52.2c-6.8,26.1-110.6-11.8-108.1-69.6S-15,225,39.9,110.7z";

var path3 = star.getAttribute("points");
var path4 = "263.6,30.2 203.07,30.2 149.9,30.2 96.33,30.2 35.8,30.2 35.8,140.75 35.8,248.6 149.9,248.6 263.6,248.6 263.6,140.75";
var path5 = "400,30.2 203.07,30.2 149.9,30.2 96.33,30.2 35.8,30.2 35.8,140.75 35.8,248.6 149.9,248.6 400,248.6 400,140.75";
var path6 = "450,30.2 203.07,30.2 149.9,30.2 96.33,30.2 35.8,30.2 35.8,140.75 35.8,248.6 149.9,248.6 450,248.6 535,140.75";

path1 = parsePath(path1);
path2 = parsePath(path2);
path3 = parsePath(path3);
path4 = parsePath(path4);
path5 = parsePath(path5);
path6 = parsePath(path6);

new TimelineMax({ repeat: -1, yoyo: true })
  .to(path1, 1, { endArray: path2, onUpdate: update.bind(blob, "d", path1) });

new TimelineMax({ repeat: -1, yoyo: true })
  .to(path3, 1, { endArray: path4, onUpdate: update.bind(star, "points", path3) })
  .to(path4, 1, { endArray: path5, onUpdate: update.bind(star, "points", path4) })
  .to(path5, 1, { endArray: path6, onUpdate: update.bind(star, "points", path5) });

function update(attr, path) {
  this.setAttribute(attr, path.string());
}

function parsePath(string) {  
  
  // Split the string into path commands and points
  var pathExp = /[achlmrqstvz]|(-?\d*\.?\d*(?:e[\-+]?\d+)?)[0-9]/ig;  
  var path = string.match(pathExp).map(function(n) { return isNaN(+n) ? n : +n; });
  
  // The first element needs to be a number, so remove if it's not
  // Calling the string method will return the path with the removed element
  path.prefix = isNaN(path[0]) ? path.shift() : "";
  path.string = function() { return path.prefix + path.join(" "); };
  
  return path;
}
!
999px

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