chromium/chrome/browser/resources/ash/settings/settings_scheduler_slider/settings_scheduler_slider.html

<style>
 :host {
    cursor: default;
    font-weight: 500;
    text-align: center;
    user-select: none;
  }

  #sliderContainer {
    display: inline-block;
    position: relative;
    user-select: none;
    width: 100%;
  }

  #sliderBar {
    background-color: rgba(var(--cros-button-background-color-primary-rgb), .24);
    background-size: 100%;
    display: inline-block;
    height: 2px;
    position: relative;
    width: inherit;
  }

  .knob {
    height: 32px;
    margin-inline-start: -16px;
    margin-top: -15px;
    position: absolute;
    width: 32px;
    z-index: 3;
  }

  .knob:focus {
    outline: none;
  }

  .knob-inner {
    background: var(--cros-button-background-color-primary);
    border-radius: 6px;
    height: 10px;
    left: 0;
    margin: 11px;
    position: absolute;
    width: 10px;
    z-index: 3;
  }

  .knob-inner:focus {
    outline: none;
  }

  #progressContainer {
    height: 100%;
    overflow: hidden;
    position: absolute;
    width: 100%;
  }

  .progress {
    background: var(--cros-button-background-color-primary);
    height: 100%;
    position: absolute;
    z-index: 1;
  }

  #labelContainer {
    height: 1.75em;
  }

  .label {
    background: var(--cros-button-background-color-primary);
    border-radius: 14px;
    color: var(--cros-bg-color);
    font-size: 12px;
    left: 0;
    line-height: 1.5em;
    margin-inline-start: -2.5em;
    position: absolute;
    text-align: center;
    transition: margin-top 200ms cubic-bezier(0, 0, 0.2, 1);
    vertical-align: middle;
    width: 5em;
  }

  .end-label-overlap {
    margin-top: -2em;
  }

  #markersContainer {
    display: flex;
    height: 100%;
    left: 0;
    position: absolute;
    width: 100%;
  }

  .active-marker,
  .inactive-marker {
    border-radius: 50%;
    display: block;
    height: 100%;
    margin-inline-start: -1px;
    padding: 0;
    position: absolute;
    width: 2PX;
    z-index: 2;
  }

  .active-marker {
    background-color: rgba(var(--cros-bg-color-rgb), 0.6);
  }

  .inactive-marker {
    --background-color-opacity: 0.6;
    background-color: rgba(
      var(--cros-button-background-color-primary-rgb),
      var(--background-color-opacity));
  }

  @media(prefers-color-scheme: dark) {
    .inactive-marker {
      --background-color-opacity: 1;
    }
  }

  #legendContainer {
    height: 10px;
    margin-bottom: 40px;
    position: relative;
    width: inherit;
  }

  #legendContainer > div {
    color: var(--cros-text-color-secondary);
    font-size: 12px;
    margin-inline-start: -2.5em;
    position: absolute;
    text-align: center;
    top: 5px;
    width: 5em;
  }

  paper-ripple {
    color: var(--cros-button-background-color-primary);
  }
</style>
<div id="sliderContainer">
  <div id="labelContainer">
    <div id="startLabel" class="label" aria-hidden="true">
      [[getTimeString_(prefStartTime.value, shouldUse24Hours_, prefs.*)]]
    </div>
    <div id="endLabel" class="label" aria-hidden="true">
      [[getTimeString_(prefEndTime.value, shouldUse24Hours_, prefs.*)]]
    </div>
  </div>
  <div id="sliderBar">
    <div id="progressContainer">
      <div id="endProgress" class="progress"></div>
      <div id="startProgress" class="progress"></div>
    </div>
    <div id="markersContainer">
    </div>
    <div id="startKnob" class="knob" tabindex="1" on-down="startDrag_"
        on-up="endDrag_" on-track="continueDrag_"
        aria-label="[[getAriaLabelStartTime_(
            prefStartTime, shouldUse24Hours_, prefs.*)]]">
      <div class="knob-inner" tabindex="-1"></div>
    </div>
    <div id="endKnob" class="knob" tabindex="2" on-down="startDrag_"
        on-up="endDrag_" on-track="continueDrag_"
        aria-label="[[getAriaLabelEndTime_(
            prefEndTime, shouldUse24Hours_, prefs.*)]]">
      <div class="knob-inner" tabindex="-1"></div>
    </div>
  </div>
  <div id="legendContainer">
    <div style$="[[getLegendStyle_(0, isRTL_)]]">
      [[getLocaleTimeString_(18, 0, shouldUse24Hours_)]]
    </div>
    <div style$="[[getLegendStyle_(25, isRTL_)]]">
      [[getLocaleTimeString_(0, 0, shouldUse24Hours_)]]
    </div>
    <div style$="[[getLegendStyle_(50, isRTL_)]]">
      [[getLocaleTimeString_(6, 0, shouldUse24Hours_)]]
    </div>
    <div style$="[[getLegendStyle_(75, isRTL_)]]">
      [[getLocaleTimeString_(12, 0, shouldUse24Hours_)]]
    </div>
    <div style$="[[getLegendStyle_(100, isRTL_)]]">
      [[getLocaleTimeString_(18, 0, shouldUse24Hours_)]]
    </div>
  </div>
  <div id="dummyRippleContainer" hidden></div>
</div>