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HTML

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Insecure Resource

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="sadface">
  Update Oct. 10 2018: broken in lots of browsers now :(
</div>
<div class="wrapper">
  <div class="label not-fun">Not So Gooey</div>
<div class="slidershell" id="slidershell1">
      <div class="slidertrack" id="slidertrack1"></div>
    <div class="sliderfill" id="sliderfill1"></div>

    <div class="sliderthumb" id="sliderthumb1"></div>

    <input class="slider" id="slider1" type="range" min="0" max="100" value="0"
    oninput="showValue(value,1);" onchange="showValue(value,1);"/>
</div>
<div class="label fun">Gooey</div>
</div>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
    <defs>
      <filter id="goo">
          <feGaussianBlur id="blur" in="SourceGraphic" result="blur" stdDeviation="10" />
          <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 26 -9.5" result="goo" />
      </filter>
    </defs>
</svg>
!

CSS 

              
                body {
  height:100vh;
  display:flex;
  background:#225378;
  overflow:hidden;
  flex-direction: column;
  margin: 0;
  font-family: "Montserrat";
}
.wrapper {
  margin:auto;
}
.slider, .slidervertical {
  position:absolute;
  left:0px;
  top:0px;
  overflow:visible;
  z-index:100;
}
/* slidershell exists only
to provide a positioning context for the range input and other elements.*/

.label {

  vertical-align:middle;
  display:inline-block;
  color: white;
  text-transform:uppercase;
  letter-spacing:.02em;
  &.fun {
    color: #EB7F00;
  }
  &.not-fun {
    color: #ACF0F2;
  }
}
.slidershell {
  margin: 0 20px;
  vertical-align:middle;
  display:inline-block;
  border:0 none;
  position:relative;
  left:0px;
  top:0px;
  overflow:visible;
  filter: url(#goo);
}

/* .slidertrack is the visible track on which the user drags the thumb button. */
.slidertrack {
  border-radius:4px;
  position:absolute;
  background: #61c2ca;
}

/* .sliderfill adds color (or a gradient as seen here) to the track as the user 
    drags the thumb. */
.sliderfill {
    position:absolute;
    pointer-events:none;
    background:#EB7F00;
    border-radius:4px;
    }

/* .sliderthumb can be any css you like including an image. 
    The dimensions must match those found in the rule for 
    input[type=range]::-webkit-slider-thumb. */
.sliderthumb {
    width:30px;
    height:30px;
    display:block;
    background:white;
    border-radius:50%;
    background-position:0px 0px;
    position:absolute;
    left:0px;
    top:0px;
    border:0 none;
    padding:0px;margin:0px;text-align:center;
    pointer-events:none;
}

/* .slidervalue can be styled as you see fit */


input[type=range] {
  &:focus {
    outline:none;
  }
  width:100%;
  height:100%;
  appearance:none;
  margin:0px;
  padding:0px;
  border:0 none;
  background:transparent;
  color:transparent;
  overflow:visible;
}

/* Make the thumbs the same size as your custom sliderthumb. 
    they will not be visible but they will be draggable.    */
input[type=range]::-webkit-slider-thumb {width:40px;height:40px;
    border-radius:0px;border:0 none;background:transparent;-webkit-appearance:none;}
svg {
  width:0;
  height:0;
  position:absolute;
  left:0;
  top:0;
}

// wow SICK responsive design
@media (max-width: 610px) {
  .label {
    display:none;
  }
  .slidershell {
    margin: 0;
  }
}

.sadface {
  background: #fefefe;
  text-align: center;
  padding: 16px;
  text-transform: uppercase;
  color: desaturate(lighten(#225378, 35%), 35%);
}
!

JS 

              
                
function showValue(val,slidernum) {
    /* setup variables for the elements of our slider */
    var thumb = document.getElementById("sliderthumb" + slidernum);
    var shell = document.getElementById("slidershell" + slidernum);
    var track = document.getElementById("slidertrack" + slidernum);
    var fill = document.getElementById("sliderfill" + slidernum);
    var slider = document.getElementById("slider" + slidernum);
    var pc = val/(slider.max - slider.min); /* the percentage slider value */
    var thumbsize = 30; /* must match the thumb size in your css */
    var bigval = 350; /* widest or tallest value depending on orientation */
    var smallval = 30; /* narrowest or shortest value depending on orientation */
    var tracksize = bigval - thumbsize;
    var fillsize = 12;
    var filloffset = 7;
    var bordersize = 2;
    var loc = pc * tracksize;
  
    document.getElementById("blur").setAttribute("stdDeviation", val/10);
    thumb.style.top =   "0px";
    thumb.style.left =  loc + "px";
    fill.style.top =  filloffset + bordersize + "px";
    fill.style.left =  "0px";
    fill.style.width =  loc + (thumbsize/2) + "px";
    fill.style.height =   fillsize + "px";
    shell.style.height =   smallval + "px";
    shell.style.width =  bigval + "px";
    track.style.height =   fillsize + "px"; /* adjust for border */
    track.style.width =  bigval - 4 + "px"; /* adjust for border */
    track.style.left =  "0px";
    track.style.top = filloffset + bordersize + "px";
}
/* we often need a function to set the slider values on page load */
function setValue(val,num) {
    document.getElementById("slider"+num).value = val;
    showValue(val,num);
}

setValue(50,1);
!
999px

Console