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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

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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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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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HTML 

              
                <p>These are all the same hexagon SVG</p>

<svg class="hexagon-fill large" viewBox="0 0 223 256" xmlns="http://www.w3.org/2000/svg" xlink="http://www.w3.org/1999/xlink" version="1.1"> <g><clipPath id="hex-mask"> <path d="M109.265882,0.866373104 L1.49975033,63.0989876 C0.571687798,63.6349237 1.201023e-15,64.6252259 0,65.6969197 L0,190.163325 C-2.08920141e-15,191.235018 0.571687798,192.225321 1.49975033,192.761257 L109.265882,254.993871 C110.194222,255.529968 111.338076,255.529961 112.266411,254.993854 L220.029691,192.761262 C220.957737,192.225322 221.529412,191.235029 221.529412,190.163347 L221.529412,65.6968971 C221.529412,64.6252154 220.957737,63.6349225 220.029691,63.098982 L112.266411,0.866390058 C111.338076,0.330282905 110.194222,0.330276441 109.265882,0.866373104 Z" id="path-1"></path></clipPath> </g><path clip-path="url(#hex-mask)" d="M109.265882,0.866373104 L1.49975033,63.0989876 C0.571687798,63.6349237 1.201023e-15,64.6252259 0,65.6969197 L0,190.163325 C-2.08920141e-15,191.235018 0.571687798,192.225321 1.49975033,192.761257 L109.265882,254.993871 C110.194222,255.529968 111.338076,255.529961 112.266411,254.993854 L220.029691,192.761262 C220.957737,192.225322 221.529412,191.235029 221.529412,190.163347 L221.529412,65.6968971 C221.529412,64.6252154 220.957737,63.6349225 220.029691,63.098982 L112.266411,0.866390058 C111.338076,0.330282905 110.194222,0.330276441 109.265882,0.866373104 Z" id="path-1"></path></svg>

<svg class="hexagon-fill small" viewBox="0 0 223 256" xmlns="http://www.w3.org/2000/svg" xlink="http://www.w3.org/1999/xlink" version="1.1"> <g><clipPath id="hex-mask"> <path d="M109.265882,0.866373104 L1.49975033,63.0989876 C0.571687798,63.6349237 1.201023e-15,64.6252259 0,65.6969197 L0,190.163325 C-2.08920141e-15,191.235018 0.571687798,192.225321 1.49975033,192.761257 L109.265882,254.993871 C110.194222,255.529968 111.338076,255.529961 112.266411,254.993854 L220.029691,192.761262 C220.957737,192.225322 221.529412,191.235029 221.529412,190.163347 L221.529412,65.6968971 C221.529412,64.6252154 220.957737,63.6349225 220.029691,63.098982 L112.266411,0.866390058 C111.338076,0.330282905 110.194222,0.330276441 109.265882,0.866373104 Z" id="path-1"></path></clipPath> </g><path clip-path="url(#hex-mask)" d="M109.265882,0.866373104 L1.49975033,63.0989876 C0.571687798,63.6349237 1.201023e-15,64.6252259 0,65.6969197 L0,190.163325 C-2.08920141e-15,191.235018 0.571687798,192.225321 1.49975033,192.761257 L109.265882,254.993871 C110.194222,255.529968 111.338076,255.529961 112.266411,254.993854 L220.029691,192.761262 C220.957737,192.225322 221.529412,191.235029 221.529412,190.163347 L221.529412,65.6968971 C221.529412,64.6252154 220.957737,63.6349225 220.029691,63.098982 L112.266411,0.866390058 C111.338076,0.330282905 110.194222,0.330276441 109.265882,0.866373104 Z" id="path-1"></path></svg>

<svg class="hexagon-fill outline" viewBox="0 0 223 256" xmlns="http://www.w3.org/2000/svg" xlink="http://www.w3.org/1999/xlink" version="1.1"> <g><clipPath id="hex-mask"> <path d="M109.265882,0.866373104 L1.49975033,63.0989876 C0.571687798,63.6349237 1.201023e-15,64.6252259 0,65.6969197 L0,190.163325 C-2.08920141e-15,191.235018 0.571687798,192.225321 1.49975033,192.761257 L109.265882,254.993871 C110.194222,255.529968 111.338076,255.529961 112.266411,254.993854 L220.029691,192.761262 C220.957737,192.225322 221.529412,191.235029 221.529412,190.163347 L221.529412,65.6968971 C221.529412,64.6252154 220.957737,63.6349225 220.029691,63.098982 L112.266411,0.866390058 C111.338076,0.330282905 110.194222,0.330276441 109.265882,0.866373104 Z" id="path-1"></path></clipPath> </g><path clip-path="url(#hex-mask)" d="M109.265882,0.866373104 L1.49975033,63.0989876 C0.571687798,63.6349237 1.201023e-15,64.6252259 0,65.6969197 L0,190.163325 C-2.08920141e-15,191.235018 0.571687798,192.225321 1.49975033,192.761257 L109.265882,254.993871 C110.194222,255.529968 111.338076,255.529961 112.266411,254.993854 L220.029691,192.761262 C220.957737,192.225322 221.529412,191.235029 221.529412,190.163347 L221.529412,65.6968971 C221.529412,64.6252154 220.957737,63.6349225 220.029691,63.098982 L112.266411,0.866390058 C111.338076,0.330282905 110.194222,0.330276441 109.265882,0.866373104 Z" id="path-1"></path></svg>
!

CSS 

              
                body {
  color: red;
  font-size: 20px;
  padding: 20px;
  text-align: center;
}

svg {
  display: inline-block;
  margin: 0 50px 20px;
  vertical-align: middle;
}

.large {
  fill: #19195A;
  width: 200px;
}

.small {
  animation: antiClockwiseSpin 10s infinite linear;
  fill: #F1C232;
  width: 100px;
}

.outline {
  fill: none;
  stroke: #5E5E8B;
  stroke-width: 80px;
  width: 50px;
}

@keyframes antiClockwiseSpin {
	0%  {transform: rotate(360deg);}
	100% {transform: rotate(0deg);}	
}

@keyframes clockwiseSpin {
	0%  {transform: rotate(-360deg);}
	100% {transform: rotate(0deg);}	
}
!

JS
!
999px

Console