<main>
  <input type="range" class="win10-thumb" />
  <input type="range" class="win10-thumb" min="0" max="100" value="25" step="5" />
  <input type="range" class="win10-thumb" disabled value="64" />
  <input type="range" />
  <input type="range" min="0" max="100" value="40" step="5" />
  <input type="range" disabled value="80" />
</main>

/*
 * 16 February 2022
 * Range Slider Progress in Chrome with pure CSS
 *
 * === This CodePen demonstrates how we can implement range slider "progress fill" in Webkit browsers using a `clip-path` and a `box-shadow` ===
 *
 * === There is an open issue about Standardizing input[type="range"] styling (https://github.com/w3c/csswg-drafts/issues/4410). For all I know, it hasn't been implemented yet ===
 *
 * === This demo is meant for Chrome browsers. But it'll also work in Firefox because Firefox provides the `::-moz-range-progress` pseudo-class ===
 *
 * more info. in the details view
 *
 */

html,
body {
  height: 100%;
}

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  display: grid;
  place-items: center;
}

main {
  display: flex;
  flex-direction: column;
  gap: 2.2em;
  padding: 1em 0;
}

html::before {
  content: "";
  position: fixed;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at center, #fff, #fafafa);
  display: block;
}

/* === range theme and appearance === */
input[type="range"] {
  font-size: 1.5rem;
  width: 12.5em;
}

input[type="range"] {
  color: #ef233c;
  --thumb-height: 1.125em;
  --track-height: 0.125em;
  --track-color: rgba(0, 0, 0, 0.2);
  --brightness-hover: 180%;
  --brightness-down: 80%;
  --clip-edges: 0.125em;
}

input[type="range"].win10-thumb {
  color: #2b2d42;

  --thumb-height: 1.375em;
  --thumb-width: 0.5em;
  --clip-edges: 0.0125em;
}

@media (prefers-color-scheme: dark) {
  html {
    background-color: #000;
  }

  html::before {
    background: radial-gradient(circle at center, #101112, #000);
  }

  input[type="range"] {
    color: #f07167;
    --track-color: rgba(255, 255, 255, 0.1);
  }

  input[type="range"].win10-thumb {
    color: #3a86ff;
  }
}

/* === range commons === */
input[type="range"] {
  position: relative;
  background: #fff0;
  overflow: hidden;
}

input[type="range"]:active {
  cursor: grabbing;
}

input[type="range"]:disabled {
  filter: grayscale(1);
  opacity: 0.3;
  cursor: not-allowed;
}

/* === WebKit specific styles === */
input[type="range"],
input[type="range"]::-webkit-slider-runnable-track,
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  transition: all ease 100ms;
  height: var(--thumb-height);
}

input[type="range"]::-webkit-slider-runnable-track,
input[type="range"]::-webkit-slider-thumb {
  position: relative;
}

input[type="range"]::-webkit-slider-thumb {
  --thumb-radius: calc((var(--thumb-height) * 0.5) - 1px);
  --clip-top: calc((var(--thumb-height) - var(--track-height)) * 0.5 - 0.5px);
  --clip-bottom: calc(var(--thumb-height) - var(--clip-top));
  --clip-further: calc(100% + 1px);
  --box-fill: calc(-100vmax - var(--thumb-width, var(--thumb-height))) 0 0
    100vmax currentColor;

  width: var(--thumb-width, var(--thumb-height));
  background: linear-gradient(currentColor 0 0) scroll no-repeat left center /
    50% calc(var(--track-height) + 1px);
  background-color: currentColor;
  box-shadow: var(--box-fill);
  border-radius: var(--thumb-width, var(--thumb-height));

  filter: brightness(100%);
  clip-path: polygon(
    100% -1px,
    var(--clip-edges) -1px,
    0 var(--clip-top),
    -100vmax var(--clip-top),
    -100vmax var(--clip-bottom),
    0 var(--clip-bottom),
    var(--clip-edges) 100%,
    var(--clip-further) var(--clip-further)
  );
}

input[type="range"]:hover::-webkit-slider-thumb {
  filter: brightness(var(--brightness-hover));
  cursor: grab;
}

input[type="range"]:active::-webkit-slider-thumb {
  filter: brightness(var(--brightness-down));
  cursor: grabbing;
}

input[type="range"]::-webkit-slider-runnable-track {
  background: linear-gradient(var(--track-color) 0 0) scroll no-repeat center /
    100% calc(var(--track-height) + 1px);
}

input[type="range"]:disabled::-webkit-slider-thumb {
  cursor: not-allowed;
}

/* === Firefox specific styles === */
input[type="range"],
input[type="range"]::-moz-range-track,
input[type="range"]::-moz-range-thumb {
  appearance: none;
  transition: all ease 100ms;
  height: var(--thumb-height);
}

input[type="range"]::-moz-range-track,
input[type="range"]::-moz-range-thumb,
input[type="range"]::-moz-range-progress {
  background: #fff0;
}

input[type="range"]::-moz-range-thumb {
  background: currentColor;
  border: 0;
  width: var(--thumb-width, var(--thumb-height));
  border-radius: var(--thumb-width, var(--thumb-height));
  cursor: grab;
}

input[type="range"]:active::-moz-range-thumb {
  cursor: grabbing;
}

input[type="range"]::-moz-range-track {
  width: 100%;
  background: var(--track-color);
}

input[type="range"]::-moz-range-progress {
  appearance: none;
  background: currentColor;
  transition-delay: 30ms;
}

input[type="range"]::-moz-range-track,
input[type="range"]::-moz-range-progress {
  height: calc(var(--track-height) + 1px);
  border-radius: var(--track-height);
}

input[type="range"]::-moz-range-thumb,
input[type="range"]::-moz-range-progress {
  filter: brightness(100%);
}

input[type="range"]:hover::-moz-range-thumb,
input[type="range"]:hover::-moz-range-progress {
  filter: brightness(var(--brightness-hover));
}

input[type="range"]:active::-moz-range-thumb,
input[type="range"]:active::-moz-range-progress {
  filter: brightness(var(--brightness-down));
}

input[type="range"]:disabled::-moz-range-thumb {
  cursor: not-allowed;
}