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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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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. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

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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HTML Settings

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HTML 

            
              <svg class="electric-loader" viewBox="0 0 100 100">
  <defs>
    <filter id="goo">
      <feGaussianBlur in="SourceGraphic" stdDeviation="4" result="blur" />
      <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 17 -2.15"  result="goo" />
      <feComposite in="SourceGraphic" in2="goo" operator="over" />
    </filter>
  </defs>
  <g filter="url(#goo)"></g>
</svg>
!

CSS 

            
              .electric-loader {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  margin: auto;
  width: 80%;
  width: 80vw;
  height: auto;
  max-width: 600px;
}

.electric-loader path { 
  fill: none;
  stroke: #A5F2E7; 
  stroke-width: 0.6; 

  stroke-dasharray: 300;
  stroke-dashoffset: -300;
  
  animation: 
    stroke-anim 2s steps(40) infinite, 
    stroke-color 0.6s steps(10)  alternate infinite;
}

@keyframes stroke-anim { to { stroke-dashoffset: 0; } }
@keyframes stroke-color { to { stroke: #49BEB7; } }

html { height: 100%; width: 100%; background: #000; }
!

JS 

            
              console.clear();

var svgns = "http://www.w3.org/2000/svg";
var twoPI = Math.PI * 2;

function ElectricLine(radius = 48, startOffset = 0){

  var path = document.createElementNS(svgns, 'path');

  var coords = [];
  var centerX = 50;
  var centerY = 50;

  for (var i = 0; i <= twoPI + 0.1; i += 0.1 ){
    coords.push( 
      centerX + ( Math.sin( i + startOffset ) * radius ), 
      centerY + ( Math.cos( i + startOffset ) * radius )
    );
  }

  // Slightly randomize the points
  function updateElectricLine(){
    path.setAttribute(
      'd', 
      coords.map((point,i)=>{ 
        return ( 
          i == 0 ? 'M' : 
          i % 2 == 0 ? 'L' : 
          ',' 
        )
         + Math.round( ( point + Math.random() * 3 ) * 100 ) / 100 
      }).join('')); 
  }

  path.style.animationDelay = '0s, ' + ( -Math.random() ) + 's';
  //path.style.animationDuration = (1.5 + Math.random()) + 's, ' + 0.2 + ( Math.random() * 0.4 ) + 's';

  updateElectricLine();

  // Have to get it in the dom for `getTotalLength` to work
  var tempSVG = document.createElementNS(svgns, 'svg');
  tempSVG.appendChild(path);
  document.body.appendChild(tempSVG);

  // Get the line length
  var length = path.getTotalLength();
  document.body.removeChild(tempSVG);

  // Set an accurate strokeDasharray & offset for the animation
  path.style.strokeDasharray = length/2; //( length * 0.48 ) + ' ' + ( length * 0.52 );
  path.style.strokeDashoffset = -length;

  return {
    el: path,
    update: updateElectricLine
  }
}


var lines = [
  new ElectricLine( 35 , Math.PI * 0.0 ),
  new ElectricLine( 34.5 , Math.PI * 1.0 ),
  new ElectricLine( 34 , Math.PI * 0.25 ),
  new ElectricLine( 33.5 , Math.PI * 1.25),
  new ElectricLine( 33 , Math.PI * 0.5 ),
  new ElectricLine( 32.5 , Math.PI * 1.5 )
];

var svg = document.querySelector('.electric-loader g');
lines.forEach( line => { svg.appendChild(line.el); });

var t = 0;
function update(){
  requestAnimationFrame(update);
  if ( t % 7 == 0 ) { 
    lines.forEach( line => { line.update(); })
  }
  t++;
}

update();
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999px

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