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HTML

              
                - var h = 2000, w = 2*h;
- var sw = .005*h, fs = Math.round(.075*h);
- var na = Math.round(.05*fs);
- var x = -11.25*fs, y = -.5*h;
- var bbw = ~~(.95*(w + x)), bbh = h - 4*fs;
- var bby = .5*fs - .5*bbh;
- var crw = .5*bbw, crh = .5*bbh;
- var dx = .5*(bbw - crw), dy = .5*(bbh - crh);
- var crx = dx, cry = bby + dy;
- var ra = Math.round(1.25*fs);

svg(viewBox=[x, y, w, h].join(' ') 
		xmlns='http://www.w3.org/2000/svg')
	style
		| svg { color: #333; font: #{Math.round(fs)}px segoe script, comic sans ms, purisa, cursive }
		| rect { fill: #ddd }
		| [y] + rect { fill: #8ef }
		| [x], tspan { fill: currentcolor }
		| g {	color: #b53 }
		| g ~ * { font: #{Math.round(fs)}px consolas, monaco, ubuntu mono, monospace }
		| g [d], g ~ [d] {
		| 	fill: none;
		| 	stroke: currentcolor;
		| 	stroke-width: #{sw}
		| }
		| marker ~ g, tspan { color: #f90}
		| g + g, tspan:nth-child(2n) { color: #95a }
		| #e ~ [d] { marker-start: url(#s); marker-end: url(#e) }
		| [id] [d] { stroke: none }
	rect(y=bby width=bbw height=bbh)
	rect(x=crx y=cry width=crw height=crh)
	g
		path(d=`M${crx}${cry}h${crw}v${crh}h${-crw}z
						M${Math.round(1.5*crx + crw)}${cry}
						q0 ${2*fs} ${Math.round(.2*fs - .5*dx)} ${2*fs}
						m${.5*fs}${Math.round(-.25*fs)}
						q${Math.round(-1.25*fs)} ${Math.round(.25*fs)} 0 ${.5*fs}`)
		text(x=crx + 5*fs y=bby + fs) clipping
		text(x=crx + 5*fs y=bby + 2*fs) rectangle
	
	path(d=`M0${bby}h${bbw}v${bbh}h${-bbw}z
					M${Math.round(5.75*fs)}${Math.round(y + .65*fs)}
					q${2*fs} 0 ${2*fs} ${Math.round(1.65*fs)}
					m${Math.round(-.25*fs)}${-.5*fs}
					q${Math.round(.25*fs)} ${Math.round(1.25*fs)} ${.5*fs} 0
					M${.5*bbw - ra} ${bby + .5*bbh}
					a${ra} ${ra} 0 1 1 ${ra} ${ra}
					m${.5*fs}${Math.round(-.25*fs)}
					q${Math.round(-1.25*fs)} ${Math.round(.25*fs)} 0 ${.5*fs}`)
	text(y=y + fs) border-box
	text(x=Math.round(.5*fs + x) y=1.3*fs) inset(<tspan>dt</tspan> <tspan>dr</tspan> <tspan>db</tspan> <tspan>dl</tspan>)
		
	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
		path(d=`M${crx}${cry - .5*dy}
						h${Math.round(-10.5*fs)}v${.5*(crh + dy)}
						M${crx} ${Math.round(cry + crh + .5*dy)}
						h${Math.round(-7.25*fs)}v${Math.round(fs - .5*(crh + dy))}`)
		text(x=crx y=cry - .5*dy + .3*fs) dt
		text(x=crx y=cry + crh + .5*dy + .3*fs) db
	
	g
		path(d=`M${1.5*crx + crw} ${3.2*fs}
						v${dy + .5*fs}
						h${.5*dx - bbw - 5.25*fs}v${-dy - 2.2*fs}
						M${Math.round(.5*(crx - fs))} ${Math.round(-.65*fs)}
						h${Math.round(-3.25*fs)}v${Math.round(1.15*fs)}`)
		text(x=Math.round(1.5*crx + crw - .5*fs) y=3*fs) dr
		text(x=Math.round(.5*crx - .5*fs) y=-.3*fs) dl
	
	path(d=`M${crx + 1.3*fs}${bby}v${dy}`)
	path(d=`M${crx + crw} ${2*fs}h${dx}`)
	path(d=`M${crx + 1.3*fs} ${cry + crh}v${dy}`)
	path(d=`M0 0h${dx}`)

// minimal SVG
<svg viewBox='-1687 -1000 4000 2000' xmlns='http://www.w3.org/2000/svg'><style>svg{color:#333;font:150px segoe script,comic sans ms,purisa,cursive}rect{fill:#ddd}[y]+rect{fill:#8ef}[x],tspan{fill:currentcolor}g{color:#b53}g~*{font:150px consolas,monaco,ubuntu mono,monospace}g [d],g~[d]{fill:none;stroke:currentcolor;stroke-width:10}marker~g,tspan{color:#f90}g+g,tspan:nth-child(2n){color:#95a}#e~[d]{marker-start:url(#s);marker-end:url(#e)}[id] [d]{stroke:none}</style><rect y='-625' width='2196' height='1400'/><rect x='549' y='-275' width='1098' height='700'/><g><path d='M549-275h1098v700h-1098zM1922-275q0 300-244 300m75-37q-187 38 0 75'/><text x='1299' y='-475'>clipping</text><text x='1299' y='-325'>rectangle</text></g><path d='M0-625h2196v1400h-2196zM863-902q300 0 300 248m-37-75q38 188 75 0M910 75a188 188 0 1 1 188 188m75-37q-187 38 0 75'/><text y='-850'>border-box</text><text x='-1612' y='195'>inset(<tspan>dt</tspan> <tspan>dr</tspan> <tspan>db</tspan> <tspan>dl</tspan>)</text><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><path d='M549-450h-1575v525M549 600h-1087v-375'/><text x='549' y='-405'>dt</text><text x='549' y='645'>db</text></g><g><path d='M1921.5 480v425h-2709v-680M200-97h-487v173'/><text x='1847' y='450'>dr</text><text x='200' y='-45'>dl</text></g><path d='M744-625v350'/><path d='M1647 300h549'/><path d='M744 425v350'/><path d='M0 0h549'/></svg>
              
            
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CSS

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

              
                
              
            
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999px

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