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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

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

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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 

              
                body.grid
	main.grid(aria-label='Shows the bottom two background layers in 3D. The first one from the bottom has an alpha of 1 all across the entire border-box. The second one, layered on top of it, has an alpha of 1 across the padding box, within the padding limit; it also has an alpha of 0 in the border area, outside the padding limit, but inside the border limit.')
		section.grid(aria-hidden='true')
			.lyr.grid(style='--i: 0')
				.cap 1st layer
				.box.grid
					.txt alpha is 
						code: strong 1
						|  everywhere
			.lyr.grid(style='--i: 1')
				.cap 2nd layer
				.box.grid
					.txt alpha is 
						code: strong 1
						|  in the 
						code padding-box
					.txt.grid
						.line between the 
							code border
							|  limit & the 
							code padding
							|  limit
						.line alpha is 
							code: strong 0
							|  in the 
							code border
							|  area
	footer.grid(aria-label='Legend matching the gold dashed border to the padding limit and the blue dashed border to the border limit')
		.inf(aria-hidden='true')
			code border
			|  limit
		.inf(aria-hidden='true')
			code padding
			|  limit
!

CSS 

              
                $c-dark: #333;
$c-nght: #040404;
$c-lght: #c7c7c7;
$c-main: #d92727;
$c-secd: #ff6fff;

$c0: #ff7a18;
$c1: #af002d;
$c2: #319197;
$ax: 30deg;
$lw: 4px;

* { margin: 0; padding: 0; }

.grid { display: grid }

body {
	grid-template-rows: 1fr max-content;
	min-height: 100vh;
	background: $c-dark;
	color: $c-lght;
	font: 1em/ 1.5 ubuntu, trebuchet ms, sans-serif;
	
	::before { filter: drop-shadow(2px 2px 1px $c-nght) }
}

code {
	color: mix($c-secd, $c-lght, 35%);
	font: 1.125em/ 1.333 ubuntu mono, consolas, monaco monospace
}

section, div { transform-style: preserve-3d }

.lyr {
	--not-i: calc(1 - var(--i));
	--sgn-i: calc(2*var(--i) - 1);
	grid-area: 1/ 1;
	grid-template-columns: 9em 1fr;
	grid-gap: 1em;
	place-self: center;
	transform: translatey(calc(var(--sgn-i)*-47%));
}

.cap {
	place-self: center;
	font: 2em z003, segoe script, comic sans ms, sans-serif
}

.box {
	--h: clamp(8em, 35vh, 25em);
	--r: calc(.375*var(--h));
	--b: calc(.5*var(--r));
	box-sizing: border-box;
	width: clamp(9em, 50vw, 32em);
	height: var(--h);
	border-radius: var(--r);
	transform: perspective(25em) rotatex($ax);
	
	&::before {
		grid-area: 1/ 1;
		margin: -.5*$lw;
		border: dashed $lw $c0;
		border-radius: inherit;
		content: ''
	}
	
	:nth-child(1) > & { background: $c-nght }
	
	:nth-child(2) > & {
		background: 
			repeating-conic-gradient(rgba($c-nght, .5) 0% 25%, transparent 0% 50%) 
				50%/ 1em 1em;
	}
}

.txt {
	grid-area: 1/ 1;
	place-content: space-between center;
	text-align: center;
	
	&:first-child {
		position: relative;
		margin: var(--b);
		line-height: calc(var(--h) - var(--r));
		
		&::before {
			position: absolute;
			z-index: -1;
			inset: -.5*$lw;
			border: dashed calc(var(--i)*#{$lw}) $c1;
			border-radius: var(--b);
			background: $c-nght;
			content: ''
		}
	}
}

.line {
	line-height: var(--b)
}

footer {
	grid-template-columns: repeat(auto-fit, 13em);
	place-content: center;
	padding: .5em;
	box-shadow: 0 -1px 2px $c-nght
}

.inf {
	&::before {
		display: inline-block;
		margin-right: .25em;
		width: 2em; height: 0;
		border-top: dashed $lw $c0;
		vertical-align: middle;
		content: ''
	}
	
	&:nth-child(2)::before { border-color: $c1 }
}
!

JS 

              
                /*
Created for my CSS-ing Candy Ghost Buttons https://css-tricks.com/css-ing-candy-ghost-buttons/ article on CSS-Tricks - check it out for context!
*/
!
999px

Console