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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>

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

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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 

              
                svg.logoanimation(
  width='100%', 
  height='100%', 
  viewbox='0 0 199 177', 
  version='1.1', 
  xmlns='http://www.w3.org/2000/svg', 
  xmlns:xlink='http://www.w3.org/1999/xlink', 
  xml:space='preserve', 
  style='fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:bevel;'
  )
  g.group
    path(d='M110.79,0.402794c-30.388,0 -57.217,15.517 -72.988,39.042l2.438,0c15.505,-22.36 41.339,-37.042 70.55,-37.042c47.317,0 85.813,38.496 85.813,85.813c0,47.318 -38.496,85.813 -85.813,85.813c-34.003,0 -63.449,-19.879 -77.329,-48.625l-2.208,0c14.027,29.881 44.402,50.625 79.537,50.625c48.42,0 87.813,-39.393 87.813,-87.813c0,-48.42 -39.393,-87.813 -87.813,-87.813Z')
    path(d='M64.3108,66.6838l-12.485,0c0.107,-0.748 0.214,-1.708 0.214,-2.349c0,-5.121 -3.737,-6.936 -14.193,-6.936c-14.832,0 -18.033,5.763 -21.447,24.969c-1.066,6.295 -1.815,11.098 -1.815,14.725c0,8.003 3.735,10.245 13.552,10.245c17.394,0 18.354,-7.257 20.807,-20.594l-17.712,0l1.921,-10.884l29.663,0l-7.47,42.041l-9.922,0l0.96,-5.335c-0.641,0.428 -7.15,6.188 -20.808,6.188c-18.779,0 -23.689,-7.468 -23.689,-19.632c0,-4.803 0.748,-10.459 1.922,-16.86c3.947,-22.409 7.681,-36.279 35.853,-36.279c14.297,0 25.074,3.52 25.074,15.471c0,1.601 -0.105,3.522 -0.425,5.23Z')
    path(d='M155.287,90.8648c0,4.872 -1.36,13.483 -4.646,16.995c-2.379,2.493 -5.892,3.512 -11.217,3.512c-7.59,0 -11.103,-2.379 -11.103,-8.951c0,-4.872 1.359,-11.33 4.872,-14.842c2.664,-2.663 6.532,-3.905 11.906,-3.956l1.102,0c6.251,0.099 9.086,1.472 9.086,7.242ZM171.716,64.8048c0,-0.226 0.339,-1.019 0.339,-3.172c0,-12.236 -10.084,-15.862 -22.207,-15.862c-3.738,0 -14.389,-0.34 -21.64,6.912c-4.575,4.574 -6.763,11.587 -8.347,19.383l-47.596,0l-7.93,44.641l12.462,0c1.134,-4.532 3.173,-7.591 13.823,-7.591c7.818,0 10.424,1.473 10.424,7.138c0,4.758 -1.586,13.936 -4.758,17.335c-2.38,2.493 -6.005,3.286 -12.011,3.286c-7.817,0 -10.763,-1.134 -10.763,-5.099c0,-0.68 0.113,-1.36 0.226,-2.153l-12.576,0c-0.227,1.473 -0.34,2.72 -0.34,3.966c0,12.01 11.331,14.955 23.34,14.955c9.744,0 16.202,-1.585 20.621,-5.665c6.344,-5.891 9.178,-20.167 9.178,-28.891c0,-9.857 -4.533,-16.429 -18.583,-16.429c-4.871,0 -12.236,0.567 -15.974,3.852l3.171,-17.788l35.23,0c-0.045,0.261 -0.089,0.523 -0.134,0.784c-0.907,4.985 -2.039,14.842 -2.039,18.808c0,14.162 7.817,19.827 21.866,19.827c10.424,0 17.222,-2.266 21.754,-6.684c6.458,-6.232 8.951,-18.695 8.951,-27.646c0,-11.673 -7.077,-16.375 -18.292,-16.631l0.003,-0.015l-0.593,0c-0.129,-0.001 -0.25,-0.009 -0.379,-0.009c-0.391,0 -0.786,0.003 -1.184,0.009l-14.699,0c1.254,-6.012 2.195,-8.868 4.892,-11.566c2.72,-2.719 7.931,-3.172 11.557,-3.172c6.798,0 9.858,1.473 9.858,5.551c0,0.567 -0.114,1.247 -0.227,1.926l12.577,0Z')
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CSS 

              
                body{
  background: red;
}
.logoanimation {
  cursor: pointer;
  max-height: 400px; // added just for Codepen layout purposes
  margin-top: 50px; // added just for Codepen layout purposes
  .group {
    path {
      fill: none;
      stroke: #FFF;
      stroke-linecap: round;
      stroke-dasharray: 1000;
      stroke-dashoffset: 1000;
      stroke-width: 1;
      animation-delay: 2s;
      animation: draw 5s linear;
      animation-fill-mode: forwards;
      /* animation-duration: 3s; */
      @if false {
        animation-iteration-count: infinite;
      } @else {
        animation-iteration-count: 1;
      }
    }
    @keyframes draw {
      0% {
        stroke-dashoffset: 1000;
      }
      80% {
        stroke-width: 1;
      }
      90% {
        stroke-dashoffset: 0;
        fill: rgba(white, 0);
      }
      100% {
        stroke-width: 0;
        fill: rgba(white, 1);
      }
    }
  }
}
!

JS
!
999px

Console