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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.

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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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Packages

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HTML 

              
                <svg width="100%" height="500">
  <g fill="#984629">
    <path d="M54.053 8.075c1.13-1.5.95-4.677.788-7.48-.005-.122-.012-.24-.02-.36C53.238.085 51.633 0 50.01 0c-6.223 0-12.177 1.146-17.67 3.224 3.918 1.884 9.986 5.126 16.73 9.916 2.3-1.98 4.036-3.808 4.983-5.065zm25.326 28.52c-2.465.28-4.542.684-6.32 1.25 8.495 14.832 11.807 33.568 12.617 47.143 8.415-8.575 13.76-20.166 14.265-33.005-5.798-7.127-13.48-16.19-20.563-15.386zm-50.498-12.8c5.968-1.242 11.575-4.246 16.046-7.417C35.6 9.954 27.822 6.62 26.275 5.986 16.598 11.216 8.855 19.55 4.35 29.65c5.856-2.333 12.197-3.52 18.426-4.677 2.014-.374 4.097-.76 6.106-1.18v.002z"/>
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      <path d="M35.924 40.05c6.436-5.93 13.233-11.25 19.45-15.523-2.073-1.834-4.152-3.524-6.192-5.074-5.164 3.882-11.924 7.705-19.282 9.235-2.06.43-4.17.82-6.21 1.2-7.862 1.46-15.408 2.873-21.753 6.414C.7 40.652.025 45.238.025 49.984c0 10.617 3.32 20.454 8.966 28.55 3.657-14.48 16.2-28.592 26.934-38.484zM59.68 21.672c5.945-3.79 11.072-6.412 14.398-7.405 2.987-.892 5.917-1.542 8.692-2.016C76.358 6.68 68.52 2.71 59.87.98c.19 3.49.274 7.323-1.826 10.107-.998 1.323-2.686 3.136-4.882 5.104 2.15 1.673 4.337 3.5 6.517 5.482zm1.966 30.804c-.78 2.644-1.765 6.877-2.904 11.777-3.362 14.47-6.58 27.417-10.338 35.673.534.017 1.067.04 1.605.04 11.647 0 22.356-3.995 30.854-10.675-.335-14.204-3.74-34.296-12.318-49.21-3.327 2.472-5.118 6.36-6.9 12.396z"/>
			
					  </g>
						</svg>
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CSS 

              
                body {
  padding: 3em;
}
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JS 

              
                const ball = document.querySelector('svg g')

ball.addEventListener('click', e => {
  TweenMax.to(ball, 1.5, {
    y: 400,
    ease: 'Bounce.easeOut'
  });
})
!
999px

Console