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HTML

              
                - var pmin = 1, pval = pmin, pmax = pmin + 4;
- var vb_d = 250, k = .05;
- var pr = Math.round(.2*k*vb_d), na = Math.round(2*pr);
- var fs = Math.round(3*na);
- var vb_x = -2*k*vb_d, vb_y = (2*k - 1)*vb_d;
- var ax0 = ~~(k*vb_d), ax1 = ~~((3*k - 1)*vb_d);
- var gmx = (1 - 4*k)*vb_d, kg = 5, gu = gmx/kg;
- var pr1 = +(5*pr/7).toFixed(2);

form#ctrls
	label(for='p') exponent 
		code: em p
	span.swrap(style=`--min:${pmin};--max:${pmax};--val:${pval}`)
		input#p(type='range' min=pmin max=pmax
						value=pval)
		output(for='p') #{pval}

section#result
	svg#graph(viewBox=[vb_x, vb_y, vb_d, vb_d].join(' '))
		style
			| * { --fs: #{fs}px }
		marker#e(markerWidth=na markerHeight=na 
						viewBox='0 -4 8 8' 
						orient='auto' refX='3')
			path(d='M8 0 0-4V4')
		- var gd = [];
		- for(var i = 0; i < kg; i++) {
			- var gc = (i + 1)*gu;
			- gd.push(`M${gc}${-gmx}V0M0${-gc}H${gmx}`)
		- }
		path(d=gd.join(''))
		text(x=-ax1 y=-Math.round(.3*fs)) k
		text(x=(gmx - .2*fs) y=.9*fs) 1
		path(d=`M0 ${ax0}V${ax1}`)
		text(x=Math.round(.3*fs) y=(ax1 + .3*fs)) <tspan id='fl'>f</tspan>,<tspan id='gl'>g</tspan>
		text(x=-.75*fs y=-(gmx - .3*fs)) 1
		path(d=`M${-ax0} 0H${-ax1}`)
		line#id(x2=gmx y2=-gmx)
		circle(r=pr1 cy=-gmx)
		circle(r=pr1 cx=gmx)
		path.fn#f
		path.fn#g
		circle#o(r=pr)
		text(x=-.8*fs y=.9*fs) 0
		circle#u(r=pr cx=gmx cy=-gmx)
		text(x=gmx+pr y=-(gmx+pr)) 1,1
	ul#legend
		li: code#fe <em>f</em>(<em>k</em>) = <em>k<sup>p</sup></em>
		li: code#ge <em>g</em>(<em>k</em>) = 1 - (1 - <em>k</em>)<em><sup>p</sup></em>
              
            
!

CSS

              
                $demo-lh: 1.25;
$demo-dark: #262626;
$demo-light: invert($demo-dark);
$demo-ll: #555;
$demo-hl: #f90;

$ctrl-pad: .5em;
$ctrl-wmax: 32em;

$lbl-w: 5.25em;

$thumb-d: 1.25em;
$thumb-r: .5*$thumb-d;

$track-h: 6px;
$track-r: .5*$track-h;
$track-m: calc((100% - #{$thumb-d}));
$track-s: calc(#{$track-m}/var(--range));
$track-x: calc(#{-$track-r} - .5*#{$track-m}/var(--range));

$graph-c0: #b53;
$graph-c1: #95a;

$t: .3s;

@mixin track {
	border: none;
	width: 100%; height: $track-h;
	border-radius: $track-r;
	background: $demo-ll;
	background: radial-gradient(circle, 
				$demo-light $track-r, transparent 0) 
			$track-x 50%/ #{$track-s} 0%, 
		radial-gradient(circle at calc(var(--pos) + #{$thumb-r}) 50%, 
				transparent $thumb-r, $demo-ll 0);
	transition: background-size $t;
}

@mixin track-focus {
	background-size: $track-s 100%, 100%;
}

@mixin thumb {
	box-sizing: border-box;
  border: solid .25*$thumb-d transparent;
	width: $thumb-d; height: $thumb-d;
	border-radius: 50%;
	background: $demo-ll content-box;
	transition: $t;
	transition-property: border-width, background-color
}

@mixin thumb-focus {
	border-width: 0;
	background: $demo-hl
}

* { margin: 0; padding: 0; font: inherit }

body {
	display: flex;
	flex-direction: column;
	overflow-x: hidden;
	min-height: 10em; height: 100vh;
	font: 1.25em/ #{$demo-lh} 
		trebuchet ms, tahoma, sans-serif;
}

code { font: 1.25em consolas, monaco, monospace }

sup { font-size: .75em }


/* ========================= */

/* 1. CONTROLS: slider, label & tooltip */
[id='ctrls'] {
	display: flex;
	align-self: center;
	align-items: center;
	justify-content: space-around;
	border: solid 0 $demo-dark;
	border-width: 0 calc(50vw - .5*#{$ctrl-wmax});
	padding: $ctrl-pad;
	width: 100vw;
	max-width: $ctrl-wmax;
	background: $demo-dark;
	color: $demo-light;
	
	@media (max-width: 400px) {
		flex-direction: column;
		
		.swrap { width: calc(100% - #{2*$ctrl-pad}) }
	}
}

.swrap {
	--range: calc(var(--max) - var(--min));
	--pos: calc((var(--val) - var(--min))*(100% - #{$thumb-d})/var(--range));
	position: relative;
	width: calc(100% - #{2*$ctrl-pad + $lbl-w});
}

[type='range'] {
	&::-webkit-slider-runnable-track, 
	&::-webkit-slider-thumb, & {
		-webkit-appearance: none
	}
	
	width: 100%; height: 1.5*$thumb-d;
	background: transparent;
	cursor: pointer;
	
	&::-webkit-slider-runnable-track {
		@include track
	}
	
	&::-moz-range-track {
		@include track
	}
	
	&::-ms-track {
		@include track;
		background: $demo-ll;
		color: transparent
	}
	
	&::-ms-fill-lower {
		display: none
	}
	
	&::-webkit-slider-thumb {
		margin-top: calc(#{$track-r} - #{$thumb-r});
		@include thumb
	}
	
	&::-moz-range-thumb {
		@include thumb
	}
	
	&::-ms-thumb {
		margin-top: 0;
		@include thumb;
		border-color: $demo-dark
	}

	&:focus {
		outline: none;
		
		&::-webkit-slider-runnable-track {
			@include track-focus
		}

		&::-moz-range-track {
			@include track-focus
		}

		&::-ms-track {
			@include track-focus
		}
		
		&::-webkit-slider-thumb {
			@include thumb-focus
		}

		&::-moz-range-thumb {
			@include thumb-focus
		}

		&::-ms-thumb {
			@include thumb-focus
		}
		
		+ output { --f: .99 }
	}
	
	+ output {
		--f: .01;
		position: absolute;
		top: 100%; left: calc(#{$thumb-r} + var(--pos));
		padding: 0 .375em;
		border-radius: 5px;
		transform-origin: 50% 0;
		transform: translate(-50%) scale(var(--f));
		opacity: var(--f);
		background: $demo-hl;
		transition: opacity $t;
	}
	
	@supports not (clip-path: circle(5px)) {
		+ output { display: none }
	}
}


/* ========================= */

/* 2. RESULT: graph & legend */
[id='result'] {
	display: flex;
	align-items: center;
	flex-direction: column;
	justify-content: center;
	flex: 1;
	
	@media (max-aspect-ratio: 5/6) {
		ul { flex-direction: column }
		ul li:first-child:after { content: '' }
	}
	
	@media (min-aspect-ratio: 7/4),
				 (min-width: $ctrl-wmax + 20em) {
		flex-direction: row;
		
		ul { flex-direction: column }
		ul li:first-child:after { content: '' }
	}
}

[id^='g'] { color: $graph-c0 }

[id^='f'] { color: $graph-c1 }


/* 2.a Graph */
[id='graph'] {
	flex: 1;
	overflow: visible;
	min-height: 10em;
	max-width: $ctrl-wmax; max-height: 100%;
	
	@media (min-height: 400px) {
		max-height: calc(100vh - #{2*$ctrl-pad + 2*$thumb-r + 2em});
	}
}

[d], [r], line {
  fill: none;
	stroke: $demo-light;
  vector-effect: non-scaling-stroke;
	
	@supports not (vector-effect: non-scaling-stroke) {
		stroke-width: .75px !important
	}
}

[x] {
	font: var(--fs) consolas, monaco, monospace;
	letter-spacing: calc(-1*var(--fs)/5)
}

[y] + [d], [r] {
	stroke: $demo-dark;
	stroke-width: 2px;
	marker-end: url(#e)
}

#e [d] { fill: $demo-dark; stroke: none }

[r] { fill: $demo-hl }

[d] + [x], em { font-style: italic }

tspan { fill: currentcolor }

[id='id'] { stroke-width: 3px }

.fn {
	stroke: currentcolor;
	stroke-width: 4px
}


/* 2.b Legend */
[id='legend'] {
	display: flex;
	padding: .5em 1em;
	
	li {
		list-style: none;
		padding: .5em;
		white-space: nowrap;
		
		&:first-child:after {
			display: inline-block;
			margin-left: 1em;
			content: '•'
		}
	}
}
              
            
!

JS

              
                const _P = document.getElementById('p'), 
			_S = _P.parentNode, 
			_O = _S.querySelector('output'), 
			_U = document.getElementById('u'), 
			_F = document.getElementById('f'), 
			_G = document.getElementById('g'), 
			_SVG = document.getElementById('graph'), 
			_Z = document.getElementById('o'), 
			MIN = +_P.min, RANGE = _P.max - _P.min, 
			PREC = 1000, 
			MAXX = +_U.getAttribute('cx'), 
			MAXY = +_U.getAttribute('cy'), 
			U = 1/PREC;

let p = +_P.value;

function updateVal() {
	_S.style.setProperty('--val', p);
	_O.textContent = p
};

function graph() {
	let i = p - _P.min, data = { f: [], g: [] };
	
	for(var j = 0; j <= PREC; j++) {
		let c = j*U, x = +(c*MAXX).toFixed(2), 
				cp = i + MIN, 
				fy = Math.pow(c, cp)*MAXY, 
				gy = (1 - Math.pow(1 - c, cp))*MAXY;

		data.f.push([x, +fy.toFixed(2)]);
		data.g.push([x, +gy.toFixed(2)]);
	}
	
	_F.setAttribute('d', `M${data.f.join('L')}`);
	_G.setAttribute('d', `M${data.g.join('L')}`);
	
	_SVG.insertBefore(_G, _Z);
	_SVG.insertBefore(_F, _G);
};

function update() {
	let newp = +_P.value;
	
	if(newp !== p) {
		_SVG.removeChild(_F);
		_SVG.removeChild(_G);
		p = newp;
		updateVal();
		graph()
	}
};

(function init() {
	graph();
	_P.addEventListener('input', update, false);
	_P.addEventListener('change', update, false);
})();
              
            
!
999px

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