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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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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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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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 

              
                - var d = 2000;
- var w = .8*d, h = .1*w;
- var o = .5*w, b = .1*d;
- var m = 1.5*b, q = .7*b;
- var sw = .005*d, fs = .07*d;
- var na = Math.round(.0625*fs);
- var pa = .2*h;

svg(viewBox=[-d, -.75*d, 2*d, 1.5*d].join(' ')
		xmlns='http://www.w3.org/2000/svg')
	path(d=`M${-o}${-o}H${o}V${o}H${-o}z`)
	style
		| * + [d], #p * {
		| 	fill: none;
		| 	stroke: #ccc;
		| 	stroke-width: #{sw}
		| }
		| [x] { fill: #b53; font: #{fs}px comic sans ms, noteworthy, dancing script ot, ubuntu, cursive }
		| style + * + [x] { fill: #aaa }
		| svg > * { fill: #eee }
		| #e ~ [x], [id] * { fill: #333; stroke: none }
		| #p + * { stroke: #b53 }
		| [x] + * { stroke: #95a }
		| [x] + * + [x] { fill: #95a }
		| #s + * + * + * { fill: #f90 }
		| #s + * { fill: url(#p); stroke: none }
		| #s + * + *, #p * { stroke: #f90 }
		| #e ~ * {
		|		marker-start: url(#s);
		|		marker-end: url(#e);
		| 	font: 700 #{fs}px courier new, monospace
		| }
		| #e ~ [d] { stroke: #333 }
	path(d=`M${-(o + m)}${-o}H${o + 2*m}
					M${o}${-(o + 2*m)}V${o + 2*m}
					M${-(o + m)} ${o}H${o + 2*m}
					M${-o}${-(o + 2*m)}V${o + m}
					M${-(o + 2*m)}${h - o}H${o - 2*h}
					M${o - h}${-(o + m)}V${o + 2*m}
					M${-(o + 2*m)} ${o - h}H${o - 2*h}
					M${o - 2*h}${-(o + m)}V${o + m}
					M${o} ${o - h}h${m}
					M${-2*fs}${-(o + 1.25*b)}v${b}
					M${-2*fs - .3*h}${-(o + .8*h)}q${.3*h} ${1.4*h} ${.6*h} 0`)
	text(x=-4*fs y=-(o + m)) wrapper
	pattern#p(width=pa height=pa 
						patternUnits='userSpaceOnUse')
		path(d=`M0 0l${pa} ${pa}`)
	path(d=`M${-o}${h - o}H${o - 2*h}V${o - h}H${-o}z`)
	text(x=-2.5*fs) chart
	path(d=`M${o - h}${-o}h${h}V${o}H${o - h}z
					M${o - .5*h}${h - o}q0${-2*h} ${1.5*h}${-2*h}
					M${o - .8*h}${.5*h - o}q${.3*h} ${1.4*h} ${.6*h} 0`)
	text(x=(o + h + .2*fs) y=-(o + h - .2*fs)) slider
	marker#s(markerWidth=na markerHeight=na 
						viewBox='-8 -4 8 8' orient='auto' refX='-7')
		path(d='M-8 0 0-4V4')
	path(d=`M${o - h} ${o - h}h${h}v${h}h${-h}`)
	path(d=`M${o + .4*fs} ${o + .4*fs}l${.75*h} ${h}
					M${o + .6*fs} ${o + h}q${-(.5*h + .6*fs)}${-1.7*h} ${h - .7*fs} ${.7*fs - h}`)
	text(x=(o + h) y=(o + 2*h)) thumb at
		tspan(dx=-4.5*fs dy=1.2*fs) minimum value
	marker#e(markerWidth=na markerHeight=na 
					 viewBox='0 -4 8 8' orient='auto' refX='7')
		path(d='M8 0 0-4V4')
	path(d=`M${-(o + b)}${-o}v${-q}
					M${-(o + b)}${h + q - o}v${-q}`)
	path(d=`M${-(o + b)} ${o - h}v${-q}
					M${-(o + b)} ${o + q}v${-q}`)
	path(d=`M${-(o + b + m)}${h - o}V${o - h}`)
	path(d=`M${o - 2*h}${-(o + b)}h${-q}
					M${o - h + q}${-(o + b)}h${-q}`)
	path(d=`M${-o}${-(o + b + m)}H${o}`)
	path(d=`M${(o + b)} ${o - h}v${-q}
					M${(o + b)} ${o + q}v${-q}`)
	path(d=`M${(o + b + m)}${-o}V${o}`)
	path(d=`M${o - h} ${(o + m + b)}h${-q}
					M${o + q} ${(o + m + b)}h${-q}`)
	path(d=`M${-o} ${(o + b)}H${o - 2*h}`)
	text(x=-(o + m - .4*fs) y=(h - o - 2*(h - fs))) k
	text(x=-(o + m - .4*fs) y=(o - 2*(h - fs))) k
	text(x=-(o + 2*m + 2.3*fs)) 1-2<tspan dx='#{-.3*fs}'>·k</tspan>
	text(x=(o - 2*h + 1.8*(h - fs)) y=-(o + b - .25*fs)) k
	text(x=-.5*fs y=-(o + b + m + .2*fs)) 1
	text(x=(o + b - .3*fs) y=(o - 2*(h - fs))) k
	text(x=(o + m + b + .2*fs)) 1
	text(x=(o - h + 1.8*(h - fs)) y=(o + b + m + .25*fs)) k
	text(x=-(h + 1.3*fs) y=(o + b + .8*fs)) 1-2<tspan dx='#{-.3*fs}'>·k</tspan>

// minimal SVG
<svg viewBox='-2000 -1500 4000 3000' xmlns='http://www.w3.org/2000/svg'><path d='M-800-800H800V800H-800z'></path><style>*+[d],#p *{fill:none;stroke:#ccc;stroke-width:10}[x]{fill:#b53;font:140px comic sans ms,noteworthy,dancing script ot,ubuntu,cursive}style+*+[x]{fill:#aaa}svg>*{fill:#eee}#e~[x],[id] *{fill:#333;stroke:none}#p+*{stroke:#b53}[x]+*{stroke:#95a}[x]+*+[x]{fill:#95a}#s+*+*+*{fill:#f90}#s+*{fill:url(#p);stroke:none}#s+*+*,#p *{stroke:#f90}#e~*{marker-start:url(#s);marker-end:url(#e);font:700 140px courier new,monospace}#e~[d]{stroke:#333}</style><path d='M-1100-800H1400M800-1400V1400M-1100 800H1400M-800-1400V1100M-1400-640H480M640-1100V1400M-1400 640H480M480-1100V1100M800 640h300M-280-1050v200M-328-928q48 224 96 0'></path><text x='-560' y='-1100'>wrapper</text><pattern id='p' width='32' height='32' patternUnits='userSpaceOnUse'><path d='M0 0l32 32'></path></pattern><path d='M-800-640H480V640H-800z'></path><text x='-350'>chart</text><path d='M640-800h160V800H640zM720-640q0-320 240-320M672-720q48 224 96 0'></path><text x='988' y='-932'>slider</text><marker id='s' markerWidth='9' markerHeight='9' viewBox='-8 -4 8 8' orient='auto' refX='-7'><path d='M-8 0 0-4V4'></path></marker><path d='M640 640h160v160h-160'></path><path d='M856 856l120 160M884 960q-164-272 62-62'></path><text x='960' y='1120'>thumb at<tspan dx='-630' dy='168'>minimum value</tspan></text><marker id='e' markerWidth='9' markerHeight='9' viewBox='0 -4 8 8' orient='auto' refX='7'><path d='M8 0 0-4V4'></path></marker><path d='M-1000-800v-140M-1000-500v-140'></path><path d='M-1000 640v-140M-1000 940v-140'></path><path d='M-1300-640V640'></path><path d='M480-1000h-140M780-1000h-140'></path><path d='M-800-1300H800'></path><path d='M1000 640v-140M1000 940v-140'></path><path d='M1300-800V800'></path><path d='M640 1300h-140M940 1300h-140'></path><path d='M-800 1000H480'></path><text x='-1044' y='-680'>k</text><text x='-1044' y='760'>k</text><text x='-1722'>1-2<tspan dx='-42'>·k</tspan></text><text x='516' y='-965'>k</text><text x='-70' y='-1328'>1</text><text x='958' y='760'>k</text><text x='1328'>1</text><text x='676' y='1335'>k</text><text x='-342' y='1112'>1-2<tspan dx='-42'>·k</tspan></text></svg>
!

CSS 

              
                body {
	display: flex;
	flex-direction: column;
	margin: 0;
	height: 100vh;
}
!

JS
!
999px

Console