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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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CSS

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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

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 

              
                <div class="container">
	<div class="big-blob"></div>
	<div class="blobs"></div>
	<div class="blobs"></div>
</div>
<svg>
	<filter id="gooey">
		<feGaussianBlur in="SourceGraphic" stdDeviation="3" result="blur" />
		<feColorMatrix in="blur" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 25 -18" result="contrast" />
	</filter>
</svg>
!

CSS 

              
                :root {
	--blue: #0a2bc5;
	--yellow: #ffcc2f;
}

body {
	margin: 0;
	height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	background: var(--blue);
}
.container {
	filter: url('#gooey');
}

div.blobs {
	background: var(--yellow);
	width: 30px;
	height: 30px;
	position: absolute;
	offset-path: path('M-2.49942505,8.7874147 C4.52775317,12.2064524 11.3921407,12.2064524 18.0937376,8.7874147 C28.146133,3.65885811 28.146133,-13.3979429 8.82754694,-17.9879156 C-10.4910391,-22.5778882 -23.1457428,-19.0670628 -31.5386951,4.36625841 C-39.9316474,27.7995796 -4.28843555,68.6949409 34.7084759,54.8415689 C73.7053873,40.9881969 90.3354587,9.86754694 81.8459418,-36.8197532 C73.3564249,-83.5070534 -25.4258151,-91.9863164 -45.0869451,-71.6603795 C-64.7480751,-51.3344425 -95.1337028,-22.0408451 -79.8240139,24.4609705 C-64.514325,70.9627862 -3.46161515,89.4571273 18.0937376,79.2268121 C39.6490904,68.9964969 64.9148327,52.3802189 68.0046783,20.7433959 C71.0945238,-10.893427 52.1572528,-43.0936393 27.1808776,-43.0936393 C2.20450232,-43.0936393 -5.78309464,-35.2053491 -9.97812023,-17.9879156 C-12.774804,-6.50962663 -10.2819056,2.41548347 -2.49942505,8.7874147 Z');
	animation: rotate 10s ease infinite, liquid 3s linear infinite;
	border-radius: 65% 75% 80% 70% / 45% 66% 70% 70%;
}
svg {
	position: absolute;
}
.big-blob {
	background: var(--yellow);
	width: 50px;
	height: 50px;
	position: absolute;
	border-radius: 65% 75% 80% 70% / 45% 66% 70% 70%;
	animation: liquid 3s linear infinite;
	top: -15px;
	left: -15px;
}

div.blobs:last-child {
	width: 20px;
	height: 20px;
	offset-path: path('M-4.71123307,16.5352174 C8.50655454,22.956337 21.4181407,22.956337 34.0235253,16.5352174 C52.9316022,6.90353792 52.9316022,-25.1299665 16.5942619,-33.750159 C-19.7430785,-42.3703516 -43.5459736,-35.7768501 -59.3327172,8.23207018 C-75.1194608,52.2409904 -8.07627662,129.044474 65.2750568,103.027166 C138.62639,77.0098571 169.906763,18.5637584 153.938386,-69.1172687 C137.970008,-156.798296 -47.834681,-172.722766 -84.8163303,-134.549664 C-121.79798,-96.3765632 -178.951898,-41.3617583 -150.155103,45.9709198 C-121.358307,133.303598 -6.52106683,168.036873 34.0235253,148.823842 C74.5681174,129.610811 122.091776,98.4046301 127.903628,38.9891333 C133.71548,-20.4263634 98.0953753,-80.8999328 51.1160028,-80.8999328 C4.13663032,-80.8999328 -10.8876592,-66.085339 -18.7783026,-33.750159 C-24.0387315,-12.1933724 -19.3497083,4.56841969 -4.71123307,16.5352174 Z');
}

@keyframes rotate {
	to {
		motion-offset: 100%;
		offset-distance: 100%;
	}
}

@keyframes liquid {
	0%, 100% {
		border-radius: 60% 70% 50% 60% / 65% 66% 60% 65%;
		transform: rotate(0deg);
	}
	25% {
		border-radius: 80% 70% 80% 60% / 60% 66% 60% 75%;
		transform: rotate(90deg);
	}
	50% {
		border-radius: 70% 60% 80% 60% / 60% 66% 75% 60%;
		transform: rotate(180deg);
	}
	75 {
		border-radius: 65% 75% 80% 70% / 45% 66% 70% 70%;
		transform: rotate(270deg);
	}
	100% {
		transform: rotate(360deg);
	}
}
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