JSFiddle - React, Tailwind, and code Playground

HTML

<div id="slider_1_wrapper" class="slider_wrapper">
  <div id="slider_1_companion" class="slider_companion"></div>
  <input type="range" id="slider_1" class="slider" min="0" max="1.0" step="any">
</div>

CSS

.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 10px;
    border-radius: 5px;   
    background: #ccc;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%; 
    background: #6c757d;
    cursor: pointer;
    z-index: 5;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #6c757d;
    cursor: pointer;
    z-index: 5;
}
/*https://stackoverflow.com/a/46318225/1997890*/
.slider_wrapper {
    position: relative;
    width: 150px;
}
.slider_companion {
    background-color: #ccc;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    position: absolute;
    top: calc(100% - 19px); /* for some reason this is not 20px (height of thumb) */
    /* left: calc( PERCENTAGE * (100% - 20px)); /* add this line dynamically via jQuery */
    display: none;
    pointer-events: none; /*click-through*/
}

JavaScript

$('#slider_1').data('last-mqtt-value', 0.5);

$('#slider_1').on('input', function() {
  // Show ghost slider
  $('#slider_1_companion').css('left', 'calc('+ $(this).data('last-mqtt-value') / $(this).attr('max') +'* (100% - 20px))');
  $('#slider_1_companion').css('display', 'block');
});

$('#slider_1').on('change', function() {
  console.log( $(this).data('last-mqtt-value'), $(this).val() );

	// Simulate new input value incoming
  ///*
  setTimeout(() => {
    $(this).data('last-mqtt-value', $(this).val());
    $('#slider_1_companion').css('display', 'none');
  },5000);
  // */
});