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CSS

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JavaScript

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HTML 

              
                <h1>HTML Input Range</h1>
<p>Demonstration of a <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/range">HTML Input Range</a> element. There's a great write-up about styling <code>&lt;input type=&quot;range&quot;&gt;</code> on <a href="https://css-tricks.com/sliding-nightmare-understanding-range-input/">CSS Tricks</a>.</p>
<p><label for="rango">Finite list of things</label>
  <input type="range" id="rango" min ="0" max="100" value="50"></p>
<p><label for="rango2">Custom Step List</label>
  <input type="range" id="rango2" min ="0" max="100" value="60" step="20" list="listo">
  <datalist id="listo">
  <option value="0"></option>
  <option value="20"></option>
  <option value="40"></option>
  <option value="60"></option>
  <option value="80"></option>
  <option value="100"></option>
</datalist>
</p>

<div class="range">
	<p>
		<label htmlFor="styled-range">Styled Range</label>
	</p>
	<div class="range__wrapper">
		<p>
			<input
				type="range"
				id="styled-range"
				name="styled-range"
				min="0"
				max="100"
				value="75"
				step="5"
				list="styled-range-list"
				class="range--progress"
				style="--min: 0; --max: 100; --val: 75"
			/>
		</p>
		<p class="range__labels" aria-hidden="true">
			<span>Min Label</span>
			<span>Max Label</span>
		</p>
		<datalist id="styled-range-list">
			<option value="0"></option>
			<option value="100"></option>
		</datalist>
		<p class="range__output">
			<output>75</output>
		</p>
	</div>
</div>
!

CSS 

              
                // Common bits
body {
  padding: 1rem;
  font-size: 16px;
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
}

a {
  color: #039;
  
  &:hover,
  &:active,
  &:focus {
    color: #06c;
  }
}

// Uncommon bits
label {
  display: block;
}

// Derived from https://codepen.io/thebabydino/pen/goYYrN
// See https://css-tricks.com/sliding-nightmare-understanding-range-input/
$range__track-width: 14.5em;
:root {
	// go full width until max
	--track-width: 100%;
	--max-track-width: 20.5em;
}

$range__track-height: 0.25em;
$range__thumb-diameter: 1.5em;
$range__track-colour: #033 !default;
$range__fill-colour: #0b6 !default;
$range__thumb-colour: #099 !default;

@mixin track() {
	box-sizing: border-box;
	border: none;
	width: $range__track-width;
	width: var(--track-width);
	max-width: var(--max-track-width);
	height: $range__track-height;
	background: $range__track-colour;
}

@mixin fill() {
	height: $range__track-height;
}

@mixin progress-fill() {
	background: $range__fill-colour;
}

@mixin thumb() {
	box-sizing: border-box;
	border: none;
	width: $range__thumb-diameter;
	height: $range__thumb-diameter;
	border-radius: 50%;
	background: $range__thumb-colour;
}

.range {
	&__wrapper {
		margin-top: 0.5em;
		width: $range__track-width;
		width: var(--track-width);
		max-width: var(--max-track-width);
	}

	.range__labels {
		display: flex;
		justify-content: space-between;
		margin-top: 0;
		margin-bottom: 1em;
		line-height: 1;
	}

	&__output {
		margin-top: 0;
	}

	[type="range"] {
    --range: calc(var(--max) - var(--min));
		--ratio: calc((var(--val) - var(--min)) / var(--range));
		--sx: calc(0.5 * #{$range__thumb-diameter} + var(--ratio) * (100% - #{$range__thumb-diameter}));

		margin: 0;
		padding: 0;
		width: $range__track-width;
		width: var(--track-width);
		max-width: var(--max-track-width);
		height: $range__thumb-diameter;
		background: transparent;
		font: 1em/1 arial, sans-serif;
    
		&,
		&::-webkit-slider-thumb {
			-webkit-appearance: none;
		}

		&::-webkit-slider-runnable-track {
			@include track;
		}

		&.range--progress::-webkit-slider-runnable-track {
			background: linear-gradient($range__fill-colour, $range__fill-colour) 0 / var(--sx) 100% no-repeat $range__track-colour;
		}

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

		&::-ms-track {
			@include track;
		}

		&::-moz-range-progress {
			@include fill;
		}

		&.range--progress::-moz-range-progress {
			@include progress-fill;
		}

		&::-ms-fill-lower {
			@include fill;
		}

		&.range--progress::-ms-fill-lower {
			@include progress-fill;
		}

		&::-webkit-slider-thumb {
			@include thumb;

			margin-top: 0.5 * ($range__track-height - $range__thumb-diameter);
		}

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

		&::-ms-thumb {
			@include thumb;

			margin-top: 0;
		}

		&::-ms-tooltip {
			display: none;
		}
	}
}
!

JS 

              
                document.querySelector(".range--progress").addEventListener("input", (event) => {
  event.target.style.setProperty('--val', event.target.value);
  document.querySelector(".range__output output").value = event.target.value;
})
!
999px

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