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HTML

              
                <div class="container">
  <div class="slider">
    <div class="track"></div>
  </div>
  <div class="output o0"> </div>
  <div class="thumb t0"></div>

  <div class="output o1"> </div>
  <div class="thumb t1"></div>
</div>
              
            
!

CSS

              
                /*GREENS: #4ac4ac, #399988, #17694f, #0a1a17;*/

* {
  margin: 0;
  padding: 0;
}

body,
html {
  width: 100%;
  height: 100%;
  margin: 0px auto;
  background-color: #333;
}

.slider {
  pointer-events: none;
  margin: 0px;
  cursor: pointer;
  /*width:200px;*/
  
  padding-left: 30%;
  padding-right: 30%;
  /*height:6px;*/
  
  background-color: #17694f;
  box-sizing: border-box;
}

.slider.focusable {
  border: 1px solid #222
}

.thumb {
  cursor: pointer;
  border-color: #333;
  border-style: solid;
  /*border-width:4px; width:16px; height:16px;*/
  
  background-color: #0f4534;
  background-color: rgba(100, 100, 100, 1);
  border-radius: 50%;
  position: absolute;
  /*top:-6px;left:50px;*/
}

.track {
  pointer-events: none;
  height: 100%;
  background-color: #4ac4ac;
}

.container {
  position: relative;
  margin: 200px auto;
  height: 30px;
  width: 220px;
}

.output {
  pointer-events: none;
  margin: 0;
  width: 30px;
  height: 30px;
  line-height: 30px;
  border-radius: 50% 50% 0 50%;
  background-color: #4ac4ac;
  text-align: center;
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
  position: absolute;
  top: -45px;
  /*left:45px*/
  
  ;
}

.output p {
  pointer-events: none;
  font-size: 14px;
  color: #0a1a17;
  text-align: center;
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  transform: rotate(-45deg);
}
              
            
!

JS

              
                var inputsRy = {
  sliderWidth: 300,
  minRange: 50,
  maxRange: 200, 
  outputWidth:30, // output width
  thumbWidth: 18, // thumb width
  thumbBorderWidth: 4,
  trackHeight: 4,
  theValue: [70, 120] // theValue[0] < theValue[1]
};
var isDragging0 = false;
var isDragging1 = false;

var range = inputsRy.maxRange - inputsRy.minRange;
var rangeK = inputsRy.sliderWidth / range;
var container = document.querySelector(".container");
var thumbRealWidth = inputsRy.thumbWidth + 2 * inputsRy.thumbBorderWidth;

// styles
var slider = document.querySelector(".slider");
slider.style.height = inputsRy.trackHeight + "px";
slider.style.width = inputsRy.sliderWidth + "px";
slider.style.paddingLeft = (inputsRy.theValue[0] - inputsRy.minRange) * rangeK + "px";
slider.style.paddingRight = inputsRy.sliderWidth - inputsRy.theValue[1] * rangeK + "px";

var track = document.querySelector(".track");
track.style.width = inputsRy.theValue[1] * rangeK - inputsRy.theValue[0] * rangeK + "px";

var thumbs = document.querySelectorAll(".thumb");
for (var i = 0; i < thumbs.length; i++) {

  thumbs[i].style.width = thumbs[i].style.height = inputsRy.thumbWidth + "px";
  console.log(inputsRy.thumbWidth + "px");
  thumbs[i].style.borderWidth = inputsRy.thumbBorderWidth + "px";
  thumbs[i].style.top = -(inputsRy.thumbWidth / 2 + inputsRy.thumbBorderWidth - inputsRy.trackHeight / 2) + "px";
  thumbs[i].style.left = (inputsRy.theValue[i] - inputsRy.minRange) * rangeK - (thumbRealWidth / 2) + "px";

}
var outputs = document.querySelectorAll(".output");
for (var i = 0; i < outputs.length; i++) {
  console.log(thumbs[i])
  outputs[i].style.width = outputs[i].style.height = outputs[i].style.lineHeight = outputs[i].style.left = inputsRy.outputWidth + "px";
  outputs[i].style.top = -(Math.sqrt(2 * inputsRy.outputWidth * inputsRy.outputWidth) + inputsRy.thumbWidth / 2 - inputsRy.trackHeight / 2) + "px";
  outputs[i].style.left = (inputsRy.theValue[i] - inputsRy.minRange) * rangeK - inputsRy.outputWidth / 2 + "px";
  outputs[i].innerHTML = "<p>" + inputsRy.theValue[i] + "</p>";
}

//events

thumbs[0].addEventListener("mousedown", function(evt) {
  isDragging0 = true;
}, false);
thumbs[1].addEventListener("mousedown", function(evt) {
  isDragging1 = true;
}, false);
container.addEventListener("mouseup", function(evt) {
  isDragging0 = false;
  isDragging1 = false;
}, false);
container.addEventListener("mouseout", function(evt) {
  isDragging0 = false;
  isDragging1 = false;
}, false);

container.addEventListener("mousemove", function(evt) {
  var mousePos = oMousePos(this, evt);
  var theValue0 = (isDragging0) ? Math.round(mousePos.x / rangeK) + inputsRy.minRange : inputsRy.theValue[0];
  console.log(theValue0);
  var theValue1 = (isDragging1) ? Math.round(mousePos.x / rangeK) + inputsRy.minRange : inputsRy.theValue[1];

  if (isDragging0) {

    if (theValue0 < theValue1 - (thumbRealWidth / 2) &&
      theValue0 >= inputsRy.minRange) {
      inputsRy.theValue[0] = theValue0;
      thumbs[0].style.left = (theValue0 - inputsRy.minRange) * rangeK - (thumbRealWidth / 2) + "px";
      outputs[0].style.left = (theValue0 - inputsRy.minRange) * rangeK - inputsRy.outputWidth / 2 + "px";
      outputs[0].innerHTML = "<p>" + theValue0 + "</p>";
      slider.style.paddingLeft = (theValue0 - inputsRy.minRange) * rangeK + "px";
      track.style.width = (theValue1 - theValue0) * rangeK + "px";

    }
  } else if (isDragging1) {

    if (theValue1 > theValue0 + (thumbRealWidth / 2) &&
      theValue1 <= inputsRy.maxRange) {
      inputsRy.theValue[1] = theValue1;
      thumbs[1].style.left = (theValue1 - inputsRy.minRange) * rangeK - (thumbRealWidth / 2) + "px";
      outputs[1].style.left = (theValue1 - inputsRy.minRange) * rangeK - inputsRy.outputWidth / 2 + "px";
      outputs[1].innerHTML = "<p>" + theValue1 + "</p>";
      slider.style.paddingRight = (inputsRy.maxRange - theValue1) * rangeK + "px";
      track.style.width = (theValue1 - theValue0) * rangeK + "px";

    }
  }

}, false);

// helpers

function oMousePos(elmt, evt) {
  var ClientRect = elmt.getBoundingClientRect();
  return { //objeto
    x: Math.round(evt.clientX - ClientRect.left),
    y: Math.round(evt.clientY - ClientRect.top)
  }
}
              
            
!
999px

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