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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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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

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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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HTML 

              
                - var h = 2000, w = 2*h;
- var x = -.5*w, y = -.5*h;
- var d = .25*h, r = .5*d, r0 = Math.round(.03*r);
- var bw = 4*d, bh = .65*d;
- var bx = .5*(bw + r) - .5*r;
- var bf = .325;
- var by = .5*bh - bf*y;
- var sw = .004*h;
- var fs = Math.round(.075*h);
- var na = Math.round(.05*fs);

svg(viewBox=[x, 1.5*y, w, 1.3*h].join(' ') 
		xmlns='http://www.w3.org/2000/svg')
	style
		| * { font: #{fs}px segoe script, comic sans ms, cursive }
		| [x] ~ * {
		| 	stroke-width: #{sw};
		| 	font: #{fs}px consolas, monaco, monospace;
		| 	word-spacing: #{Math.round(-.375*fs)}px
		| }
		| [x] + [d] { stroke: #ccc; fill: none }
		| [d] + [d] {
		| 	stroke: #333;
		| 	marker-start: url(#s);
		| 	marker-end: url(#e)
		| }
		| rect, [r], #p *, g [x] + [d] { fill: none; stroke: #f90 }
		| [r='#{r}'] { stroke: #b5a }
		| rect ~ [r] { stroke: #b53 }
		| [r] + [y] { opacity: .3; fill: url(#p) }
		| #p * { stroke-width: #{bw}; stroke-dasharray: #{1.25*sw} }
		| g [x] { fill: #f90 }
	pattern#p(viewBox=[0, 0, bw, bh].join(' ') width='100%' height='100%')
		path(d=`M0 0l${bw} ${Math.round(2.5*bh)}`)
	marker#s(markerWidth=na markerHeight=na 
						viewBox='-8 -4 8 8' orient='auto' refX='-7')
		path(d='M-8 0 0-4V4')
	marker#e(markerWidth=na markerHeight=na 
					 viewBox='0 -4 8 8' orient='auto' refX='7')
		path(d='M8 0 0-4V4')
	g
		text(x=Math.round(.5*(bx - x) - 1.75*fs) y=Math.round(-3.25*fs)) bar gets 
			tspan(dx=Math.round(-4.25*fs) dy=Math.round(1.125*fs)) hidden
		path(d=`M${.5*(bx - x)}${Math.round(-1.75*fs)}
						Q${.5*(bx - x) - fs}${Math.round(by - bh - 1.5*fs)} ${.5*(bx - x) - fs} ${Math.round(by - bh - .5*fs)}
						m${-.5*fs}${Math.round(-.75*fs)}
						q${.5*fs} ${2*fs} ${fs} 0`)
	text(x=-(bx + r) y=Math.round(1.5*y + fs)) assembly always middle aligned
	text(x=x + .1*fs y=Math.round(bf*y - 2.375*r)) a = (w + r)/2
	text(x=bx y=Math.round(.7*fs + 1.375*r - bf*y)) x = a - r
	text(x=bx y=Math.round(1.7*fs + 1.375*r - bf*y)) x = (w - r)/2
	text(x=Math.round(x + .25*fs) y=Math.round(fs - by)) expanded
	text(x=Math.round(x + .25*fs) y=Math.round(2*fs - by)) state
	text(x=Math.round(x + .25*fs) y=Math.round(by - bh + fs)) collapsed
	text(x=Math.round(x + .25*fs) y=Math.round(by - bh + 2*fs)) state
	text(x=bx - .5*r - .3*fs y=Math.round(bf*y - 1.375*r)) d
	text(x=Math.round(-.25*(bw + r) - .3*fs) y=Math.round(bf*y - 2.375*r)) a
	text(x=Math.round(.25*(bw + r) - .3*fs) y=Math.round(bf*y - 2.375*r)) a
	text(x=-fs y=Math.round(bf*y - 3.375*r)) w + r
	text(x=bx - r - .3*fs y=Math.round(.7*fs + (bf*y + 1.375*r))) r
	text(x=bx - .3*fs y=Math.round(.7*fs + (bf*y + 1.375*r))) r
	text(x=Math.round(.25*(bw - r) - .3*fs) y=Math.round(.7*fs + 1.375*r - bf*y)) x
	text(x=Math.round(.25*(r - bw) - .3*fs) - r y=Math.round(.7*fs + 1.375*r - bf*y)) x
	text(x=-.5*r - .3*fs y=Math.round(.7*fs + 1.375*r - bf*y)) r
	text(x=-(.5*r + .3*fs) y=Math.round(.7*fs + 2.375*r - bf*y)) w
	path(d=`M0${bf*y - 3*r}V${2*r - bf*y}
					M${-(.5*r + bx)}${bf*y - 3.5*r}V${2.5*r - bf*y}
					M${bx + .5*r}${bf*y - 3.5*r}V${1.5*r + bf*y}
					M${bx - 1.5*r}${bf*y - 1.5*r}v${3*r}
					M${bx - .5*r}${bf*y}V${2.5*r - bf*y}
					M${-r} ${-bf*y}v${1.5*r}`)
	path(d=`M${bx - 1.5*r} ${Math.round(bf*y + 1.25*r)}h${r}`)
	path(d=`M${bx - .5*r} ${Math.round(bf*y + 1.25*r)}h${r}`)
	path(d=`M${bx - 1.5*r}${Math.round(bf*y - 1.25*r)}h${d}`)
	path(d=`M${-(.5*r + bx)}${Math.round(bf*y - 3.25*r)}H${.5*r + bx}`)
	path(d=`M${-(.5*r + bx)}${Math.round(bf*y - 2.25*r)}H0`)
	path(d=`M${.5*r + bx}${Math.round(bf*y - 2.25*r)}H0`)
	path(d=`M${-(.5*r + bx)} ${Math.round(1.25*r - bf*y)}H${-r}`)
	path(d=`M0 ${Math.round(1.25*r - bf*y)}h${bx - .5*r}`)
	path(d=`M${-r} ${Math.round(1.25*r - bf*y)}H0`)
	path(d=`M${-(.5*r + bx)} ${Math.round(2.25*r - bf*y)}h${bw}`)
	circle(cx=bx - .5*r cy=bf*y r=r)
	circle(cy=-bf*y r=r)
	rect(x=-r y=Math.round(by - bh) width=bw height=bh)
	rect(x=-(bx + .5*r) y=Math.round(-by) width=bw height=bh)
	circle(cx=bx - 1.5*r cy=bf*y r=r0)
	circle(cx=bx - .5*r cy=bf*y r=r0)
	circle(cx=-(.5*r + bx) cy=bf*y r=r0)
	circle(cx=bx + .5*r cy=bf*y r=r0)
	circle(cx=-r cy=-bf*y r=r0)
	circle(cy=-bf*y r=r0)
	circle(cx=r cy=-bf*y r=r0)

<svg viewBox='-2000 -1500 4000 2600' xmlns='http://www.w3.org/2000/svg'><style>*{font:150px segoe script,comic sans ms,cursive}[x]~*{stroke-width:8;font:150px consolas,monaco,monospace;word-spacing:-56px}[x]+[d]{stroke:#ccc;fill:none}[d]+[d]{stroke:#333;marker-start:url(#s);marker-end:url(#e)}rect,[r],#p *,g [x]+[d]{fill:none;stroke:#f90}[r='250']{stroke:#b5a}rect~[r]{stroke:#b53}[r]+[y]{opacity:.3;fill:url(#p)}#p *{stroke-width:2000;stroke-dasharray:10}g [x]{fill:#f90}</style><pattern id='p' viewBox='0 0 2000 325' width='100%' height='100%'><path d='M0 0l2000 813'/></pattern><marker id='s' markerWidth='8' markerHeight='8' viewBox='-8 -4 8 8' orient='auto' refX='-7'><path d='M-8 0 0-4V4'/></marker><marker id='e' markerWidth='8' markerHeight='8' viewBox='0 -4 8 8' orient='auto' refX='7'><path d='M8 0 0-4V4'/></marker><g><text x='1238' y='-487'>bar gets <tspan dx='-637' dy='169'>hidden</tspan></text><path d='M1500-262Q1350-62 1350 88m-75-112q75 300 150 0'/></g><text x='-1250' y='-1350'>assembly always middle aligned</text><text x='-1985' y='-919'>a = (w+r)/2</text><text x='1000' y='774'>x = a-r</text><text x='1000' y='924'>x = (w-r)/2</text><text x='-1962' y='-337'>expanded</text><text x='-1962' y='-187'>state</text><text x='-1962' y='313'>collapsed</text><text x='-1962' y='463'>state</text><text x='830' y='-669'>d</text><text x='-607' y='-919'>a</text><text x='518' y='-919'>a</text><text x='-150' y='-1169'>w+r</text><text x='705' y='124'>r</text><text x='955' y='124'>r</text><text x='393' y='774'>x</text><text x='-732' y='774'>x</text><text x='-170' y='774'>r</text><text x='-170' y='1024'>w</text><path d='M0-1075V825M-1125-1200V950M1125-1200V50M625-700v750M875-325V950M-250 325v375'/><path d='M625-12h250'/><path d='M875-12h250'/><path d='M625-637h500'/><path d='M-1125-1137H1125'/><path d='M-1125-887H0'/><path d='M1125-887H0'/><path d='M-1125 638H-250'/><path d='M0 638h875'/><path d='M-250 638H0'/><path d='M-1125 888h2000'/><circle cx='875' cy='-325' r='250'/><circle cy='325' r='250'/><rect x='-250' y='163' width='2000' height='325'/><rect x='-1125' y='-487' width='2000' height='325'/><circle cx='625' cy='-325' r='8'/><circle cx='875' cy='-325' r='8'/><circle cx='-1125' cy='-325' r='8'/><circle cx='1125' cy='-325' r='8'/><circle cx='-250' cy='325' r='8'/><circle cy='325' r='8'/><circle cx='250' cy='325' r='8'/></svg>
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CSS 

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

JS
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999px

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