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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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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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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 esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <svg xmlns="http://www.w3.org/2000/svg" width="700" height="450" viewBox="0 0 1400 900">
<rect x="595" y="423" width="610" height="377" fill="blue"/>
<polygon points="506,423 900,190 1294,423" fill="yellow"/>
<polygon points="993,245 993,190 1086,190 1086,300" fill="red"/>
<path d="M900,190  L993,245 V201  A11,11 0 0,1 1004,190  H1075  A11,11 0 0,1 1086,201  V300  L1294,423 H1216  A11,11 0 0,0 1205,434  V789  A11,11 0 0,1 1194,800  H606  A11,11 0 0,1 595,789  V434  A11,11 0 0,0 584,423  H506 L900,190" fill="none" stroke="black" stroke-width="13"  stroke-linejoin="round" stroke-linecap="round"  />
<path id="first" d="M30,0 H-10  A10,10 0 0,0 -20,10  A20,20 0 1,1 -40,-10  H20     A10,10 0 0,1 30,0     M-40,20  A10,10 1 0,0 -40,0  A10,10 1 0,0 -40,20  M0,0"   transform="translate(0,0)" fill="green" stroke="black" stroke-width="5"  stroke-linejoin="round" stroke-linecap="round"  fill-rule="evenodd" />
<path id="second" d="M30,0 H-10  A10,10 0 0,1 -20,-10  A20,20 0 1,0 -40,10  H20     A10,10 0 0,0 30,0     M-40,-20  A10,10 1 0,0 -40,0  A10,10 1 0,0 -40,-20  M0,0"   transform="translate(0,0)" fill="forestgreen" stroke="black" stroke-width="5"  stroke-linejoin="round" stroke-linecap="round"  fill-rule="evenodd" />
</svg>
!

CSS 

              
                #first {
    motion-path: path("M900,190  L993,245 V201  A11,11 0 0,1 1004,190  H1075  A11,11 0 0,1 1086,201  V300  L1294,423 H1216  A11,11 0 0,0 1205,434  V789  A11,11 0 0,1 1194,800  H606  A11,11 0 0,1 595,789  V434  A11,11 0 0,0 584,423  H506 L900,190");
    offset-path: path("M900,190  L993,245 V201  A11,11 0 0,1 1004,190  H1075  A11,11 0 0,1 1086,201  V300  L1294,423 H1216  A11,11 0 0,0 1205,434  V789  A11,11 0 0,1 1194,800  H606  A11,11 0 0,1 595,789  V434  A11,11 0 0,0 584,423  H506 L900,190");
    transform: translate(0px,0px);
} 
#second {
    motion-path: path("M900,190  L993,245 V201  A11,11 0 0,1 1004,190  H1075  A11,11 0 0,1 1086,201  V300  L1294,423 H1216  A11,11 0 0,0 1205,434  V789  A11,11 0 0,1 1194,800  H606  A11,11 0 0,1 595,789  V434  A11,11 0 0,0 584,423  H506 L900,190");
    offset-path: path("M900,190  L993,245 V201  A11,11 0 0,1 1004,190  H1075  A11,11 0 0,1 1086,201  V300  L1294,423 H1216  A11,11 0 0,0 1205,434  V789  A11,11 0 0,1 1194,800  H606  A11,11 0 0,1 595,789  V434  A11,11 0 0,0 584,423  H506 L900,190");
    transform: translate(0px,0px);
}
!

JS 

              
                var positionKeyframes = [
  {motionOffset: "0%", offsetDistance: "0%"},
  {motionOffset: "100%", offsetDistance: "100%"}
];
var positionTiming = {duration: 12000, iterations: Infinity};
first.animate(positionKeyframes, positionTiming);
second.animate(positionKeyframes, positionTiming);
var firstRotationKeyframes = [
  {motionRotation: "auto 0deg", offsetRotate: "auto 0deg"},
  {motionRotation: "auto -45deg", offsetRotate: "auto -45deg"},
  {motionRotation: "auto 0deg", offsetRotate: "auto 0deg"}
];
var secondRotationKeyframes = [
  {motionRotation: "auto 0deg", offsetRotate: "auto 0deg"},
  {motionRotation: "auto 45deg", offsetRotate: "auto 45deg"},
  {motionRotation: "auto 0deg", offsetRotate: "auto 0deg"}
];
var rotationTiming = {duration: 1000, iterations: Infinity};
first.animate(firstRotationKeyframes, rotationTiming);
second.animate(secondRotationKeyframes, rotationTiming);
!
999px

Console