Firefox range slider move thumb above the track

Question

I have a custom styled range slider that works wonderfully on Chrome, however is not functioning on as intended on Firefox.

The main issue that I am facing is that on Chrome I am able to set the margin-top of the slider thumb to be a negative value which moves it up above the track as shown in the image below:

However, on Firefox I am unable to do this despite customizing the slider thumb. I am attaching a fiddle with my code:

$( window ).on( "load", function() { 
    sliderValues();    
});

$( window ).resize(function() {
   sliderValues();  
});

let mouseDown;
$(document).mousedown(function() {
    mouseDown = true;
}).mouseup(function() {
    mouseDown = false;  
});


let stepChangeThreshold = 3000;


$('#range').on('mousemove',function(e){
    if (!mouseDown) return;
    
    this.previousClientX = this.previousClientX || e.clientX;
    let stepChangeThresholdPositionX = this.getBoundingClientRect().x+($('#range').width()*stepChangeThreshold/5500);
    
    
    if (this.value == stepChangeThreshold){
        if ((this.previousClientX > e.clientX) && (e.clientX < stepChangeThresholdPositionX)){
            this.step = 250;
        } else {
            this.step = 500;
        }
        
        
    }


    this.previousClientX = e.clientX;
});


$('#range').on('input', function() {    
  sliderValues();   

  var val = $('#range').val();  
  if (val >= stepChangeThreshold) {
      this.step = 500;
  } else {
      this.step = 250;
  };
  this.previousVal = val;
    
});

function sliderValues(){
    var val = $('#range').val();
    var min = $('#range').attr('min');
    var max = $('#range').attr('max');
    var portion = (val - min) / (max - min);
    $('#rangeV').html('<span>$'+ val +'</span>');
    $('#rangeV').css('left', portion * ($('#range').width() - 70));
    
    let thumbSliderRatio = (70/$('#range').width())*100;
    let fillPercent = Number(portion*(100-thumbSliderRatio) + thumbSliderRatio/2) + "%";
    
    $('#range').css('background','linear-gradient(to right, #008e39 0%, #008e39 ' + fillPercent + ', #ccc ' + fillPercent + ', #ccc 100%)');     
};

.borrowheading {
    text-align: center;
    font-size: 21px;
    font-family: 'Open Sans', sans-serif;
    font-weight: 800;
    padding: 25px;
    margin-top: 50px;
}

#range {
    -webkit-appearance: none;
    margin: 20px 0;
    width: 100%;
    background: linear-gradient(to right, #008e39 0%, #008e39 50%, #ccc 50%, #ccc 100%);
    border-radius: 8px;
    height: 7px;
    width: 100%;
    outline: none;
    
}
#range:focus {
    outline: none;
}

#range::-webkit-slider-thumb {
    height: 70px;
    width: 70px;
    border-radius: 50%;
    background-color: #008e39;
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -100px;
}

#range::-moz-range-thumb {
    height: 70px;
    width: 70px;
    border-radius: 50%;
    background-color: #008e39;
    cursor: pointer;
    margin-top: -100px;
    border: none;
}

.range-wrap{
    width: 90%;
    position: relative;
    margin: auto;
    margin-top: 120px;
}
.range-value{
    position: absolute;
}
.range-value span{
    width: 70px;
    height: 70px;
    text-align: center;
    color: #fff;
    font-size: 20px;
    line-height: 48px;
    display: block;
    position: absolute;
    pointer-events: none;
    font-family: 'Open Sans', sans-serif;
    font-weight: 700;
    margin-top: -64px;
}

.range-value span:after {
    content: "";
    position: absolute;
    width: 0;
    height: 36px;
    border: 2px solid #008e39;
    top: 55px;
    left: calc(50% - 1px);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<h4 class="borrowheading">How much would you like to borrow today?</h4>
<div class="range-wrap">
    <div class="range-value" id="rangeV"></div>
    <input id="range" type="range" min="500" max="5000" step="250" value="1000">
</div>

How can I raise my slider thumb by 100px on Firefox?

Answer 1

Instead of using the negative margin, you can use transform, and translate the range element towards the negative y axis. In addition, I gave the span containing the price a z-index: 1 and decreased the height of the pseudo element which represents the connecting bar between the dragable range element and the slider itself.

$( window ).on( "load", function() { 
    sliderValues();    
});

$( window ).resize(function() {
   sliderValues();  
});

let mouseDown;
$(document).mousedown(function() {
    mouseDown = true;
}).mouseup(function() {
    mouseDown = false;  
});


let stepChangeThreshold = 3000;


$('#range').on('mousemove',function(e){
    if (!mouseDown) return;
    
    this.previousClientX = this.previousClientX || e.clientX;
    let stepChangeThresholdPositionX = this.getBoundingClientRect().x+($('#range').width()*stepChangeThreshold/5500);
    
    
    if (this.value == stepChangeThreshold){
        if ((this.previousClientX > e.clientX) && (e.clientX < stepChangeThresholdPositionX)){
            this.step = 250;
        } else {
            this.step = 500;
        }
        
        
    }


    this.previousClientX = e.clientX;
});


$('#range').on('input', function() {    
  sliderValues();   

  var val = $('#range').val();  
  if (val >= stepChangeThreshold) {
      this.step = 500;
  } else {
      this.step = 250;
  };
  this.previousVal = val;
    
});

function sliderValues(){
    var val = $('#range').val();
    var min = $('#range').attr('min');
    var max = $('#range').attr('max');
    var portion = (val - min) / (max - min);
    $('#rangeV').html('<span>$'+ val +'</span>');
    $('#rangeV').css('left', portion * ($('#range').width() - 70));
    
    let thumbSliderRatio = (70/$('#range').width())*100;
    let fillPercent = Number(portion*(100-thumbSliderRatio) + thumbSliderRatio/2) + "%";
    
    $('#range').css('background','linear-gradient(to right, #008e39 0%, #008e39 ' + fillPercent + ', #ccc ' + fillPercent + ', #ccc 100%)');     
};

.borrowheading {
    text-align: center;
    font-size: 21px;
    font-family: 'Open Sans', sans-serif;
    font-weight: 800;
    padding: 25px;
    margin-top: 50px;
}

#range {
    -webkit-appearance: none;
    margin: 20px 0;
    width: 100%;
    background: linear-gradient(to right, #008e39 0%, #008e39 50%, #ccc 50%, #ccc 100%);
    border-radius: 8px;
    height: 7px;
    width: 100%;
    outline: none;
    
}
#range:focus {
    outline: none;
}

#range::-webkit-slider-thumb {
    height: 70px;
    width: 70px;
    border-radius: 50%;
    background-color: #008e39;
    cursor: pointer;
    -webkit-appearance: none;
    transform: translateY(-65px);    
}

#range::-moz-range-thumb {
    height: 70px;
    width: 70px;
    border-radius: 50%;
    background-color: #008e39;
    cursor: pointer;
    border: none;
    transform: translateY(-65px);  
}

.range-wrap{
    width: 90%;
    position: relative;
    margin: auto;
    margin-top: 120px;
}
.range-value{
    position: absolute;
}
.range-value span{
    width: 70px;
    height: 70px;
    text-align: center;
    color: #fff;
    font-size: 20px;
    line-height: 48px;
    display: block;
    position: absolute;
    pointer-events: none;
    font-family: 'Open Sans', sans-serif;
    font-weight: 700;
    margin-top: -64px;
    z-index: 1;
}

.range-value span:after {
    content: "";
    position: absolute;
    width: 0;
    height: 32px;
    border: 2px solid #008e39;
    top: 55px;
    left: calc(50% - 1px);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<h4 class="borrowheading">How much would you like to borrow today?</h4>
<div class="range-wrap">
    <div class="range-value" id="rangeV"></div>
    <input id="range" type="range" min="500" max="5000" step="250" value="1000">
</div>