Connecting input range arc thumb to slider with curve

Question

I have a solved question Animating range ticks when moving range thumb. From that question, I have a input type="range" with custom appearance - thumb is made like an arc (half circle), span that takes range's value and is designed as a circled thumb and div with mask that act like ticks - steps.

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From this expected result

I was trying to connect that arc to the slider with a curve. I tried to use pseudo elements but gradient doesn't sync with gradient on the slider and I cannot make a curve like shown in the picture. I also tried using JS canvas to draw that curve and place it on desired place but gradient again doesn't sync - becomes a stationary color.

I thought using a CSS mask but I'm not sure if it's possible to make wanted curve with that.

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These are my main research points:

• CSS Tricks - Styling Cross-Browser Compatible Range Inputs
• Gradient Stroke Along Curve in Canvas - Tried to make similar curve (connecting point) with canvas

This is my CodePen and the code

// Position of span that shows range value and tick curve position
const tickContainer = document.getElementById('tickContainer');

const range = document.getElementById('range');
const rangeV = document.getElementById('rangeValue');
const setValue = () => {
  // Span position and inner value
  const newValue = Number((range.value - range.min) * 100 / (range.max - range.min));
  const newPosition = 35 - (newValue * 0.7);
  rangeV.style.left = `calc(${newValue}% + (${newPosition}px))`;
  rangeV.innerHTML = `<span>${range.value}%</span>`;
  
  // Tick curve position
  tickContainer.style.setProperty('--p', `calc(${newValue}%)`);
};

// Initialize setValue onload and oninput
document.addEventListener("DOMContentLoaded", setValue);
range.addEventListener('input', setValue);

body {
  font-family: Arial;
  margin: 50px;
}

.range-wrap {
  position: relative;
}

/* Styling of ticks (lines) over the range */
.ticks {
  position: absolute;
  left: -15px;
  right: -15px;
  padding:0 15px;
  top: -30px;
  height: 45px;
  background: repeating-linear-gradient(to right, #D3D3D3 0 1px, transparent 1px 9px);
  background-clip:content-box;
  -webkit-mask: 
    radial-gradient(farthest-side at bottom,transparent 75%, #fff 76% 98%, transparent) 
      var(--p) 0px/100px 50px, 
    linear-gradient(#fff, #fff) var(--p) 100%/95px 10px,
    linear-gradient(#fff, #fff) bottom       /100% 10px;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-composite: source-over,destination-out;
  mask: 
    radial-gradient(farthest-side at bottom,transparent 75%, #fff 76% 98%, transparent) 
      var(--p) 0px/100px 50px, 
    linear-gradient(#fff, #fff) var(--p) 100%/95px 10px,
    linear-gradient(#fff, #fff) bottom       /100% 10px;
  mask-repeat: no-repeat;
  mask-composite: exclude;
}

/* Styling the range */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  margin: 20px 0;
  width: 100%;
  height: 4px;
  background-image: linear-gradient(125deg, #e0e0e0 34%, rgb(0,12,110) 100%);
  outline: none;
  transition: all 100ms ease;
}

/* Range track */
input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 4px;
  cursor: pointer;
  border-radius: 25px;
}

input[type=range]::-moz-range-track {
  width: 100%;
  height: 4px;
  cursor: pointer;
  border-radius: 25px;
}

/* Range thumb */
input[type=range]::-webkit-slider-thumb {
  height: 70px;
  width: 70px;
  -webkit-transform: translateY(-44.3%) rotate(-45deg);
          transform: translateY(-44.3%) rotate(-45deg);
  -webkit-appearance: none;
  appearance: none;
  background: #ddd;
  border: 3px solid transparent;
  border-color: transparent transparent #fff #fff;
  border-radius: 50%;
  cursor: pointer;
  background-image: linear-gradient(white, white), linear-gradient(to right, #e0e0e0 34%, rgb(0,12,110) 100%);
  background-attachment: fixed, fixed;
  background-clip: padding-box, border-box;
  transition: all 200ms ease;
}

input[type=range]::-moz-range-thumb {
  height: 63px;
  width: 63px;
  appearance: none;
  background: #ddd;
  border: 3px solid transparent;
  transition: all 200ms ease;
  border-color: transparent transparent #fff #fff;
  border-radius: 50%;
  cursor: pointer;
  background-image: linear-gradient(white, white), linear-gradient(to right, #e0e0e0 34%, rgb(0,12,110) 100%);
  background-attachment: fixed, fixed;
  background-clip: padding-box, border-box;
}

/* Range value (label) inside of range thumb */
.range-value {
  position: absolute;
  top: -50%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  z-index: 99;
  user-select: none;
  select: none;
  pointer-events: none;
}

.range-value span {
  width: 50px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  color: #fff;
  background: rgb(0,12,110);
  font-size: 18px;
  display: block;
  position: absolute;
  top: 20px;
  border-radius: 50%;
  user-select: none;
  select: none;
  pointer-events: none;
  z-index: 100;
}

<div class="range-wrap">
  <!-- Ticks (lines) over slider -->
  <div class="ticks" id="tickContainer">
  </div>
  <!-- Range value inside of range thumb -->
  <div class="range-value" id="rangeValue"></div>
  <!-- Range itself -->
  <input id="range" type="range" min="1" max="100" value="5" step="1">
</div>

Answer 1

Here is different idea where I will rely on mask like my previous answer but this time I will introduce and SVG for the curved part. I will also optimize the code a little to have less of code.

You will notice that I am using the same mask for both the ticks and the range element but with some different values since the ticks need to have a bigger curve.

// Position of span that shows range value and tick curve position
const tickContainer = document.querySelector('.range-wrap');

const range = document.getElementById('range');
const rangeV = document.getElementById('rangeValue');
const setValue = () => {
  // Span position and inner value
  const newValue = Number((range.value - range.min) * 100 / (range.max - range.min));
  const newPosition = 30 - (newValue * 0.6);
  rangeV.style.left = `calc(${newValue}% + (${newPosition}px))`;
  rangeV.innerHTML = `${range.value}%`;
  
  // Tick curve position
  tickContainer.style.setProperty('--p', `calc(${newValue}%)`);
};

// Initialize setValue onload and oninput
document.addEventListener("DOMContentLoaded", setValue);
range.addEventListener('input', setValue);

body {
  font-family: Arial;
  margin: 50px;
}

.range-wrap {
  position: relative;
  --svg:url("data:image/svg+xml;utf8, <svg xmlns='http://www.w3.org/2000/svg' viewBox='0 15 64 50' preserveAspectRatio='none' ><path d='M0 64 C16 64 16 32 32 32 C48 32 48 64 64 64 L64 48 C52 48 52 16 32 16 C12 16 12 48 0 48 L0 64 Z' fill='white'/></svg>") var(--p,0) 0;
}

/* Styling of ticks (lines) over the range */
.ticks {
  --sw:120px; /* control the width of the curve */
  
  position: absolute;
  left: -30px;
  right: -30px;
  padding:0 10px;
  height: 50px;
  background: repeating-linear-gradient(to right, red 0 3px, transparent 1px 9px) content-box;
  -webkit-mask:var(--svg) /var(--sw) 50px,
     linear-gradient(to right, #fff calc(50% - var(--sw)/2 + 1px), transparent 0 calc(50% + var(--sw)/2 - 1px), #fff 0) 
     right var(--p) top 33px/calc(200% - var(--sw)) 16px;
  -webkit-mask-repeat:no-repeat;
  z-index:999;
}

/* Styling the range */
input[type=range] {
  --sw:100px; /* control the width of the curve */
  
  -webkit-appearance: none;
  appearance: none;
  margin: 20px 0 20px -20px;
  padding:0 20px;
  width:100%;
  height: 90px;
  -webkit-mask: 
    var(--svg) /var(--sw) 50px,
    linear-gradient(to right, #fff calc(50% - var(--sw)/2 + 1px), transparent 0 calc(50% + var(--sw)/2  - 1px), #fff 0) 
    right var(--p) top 33px/calc(200% - var(--sw)) 16px;
  -webkit-mask-repeat:no-repeat;
  background: linear-gradient(125deg, #e0e0e0 34%, rgb(0,12,110) 100%);
  outline: none;
}

/* Range track */
input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 50px;
  cursor: pointer;
  border-radius: 25px;
}

input[type=range]::-moz-range-track {
  width: 100%;
  height: 50px;
  cursor: pointer;
  border-radius: 25px;
}

/* Range thumb */
input[type=range]::-webkit-slider-thumb {
  height: 60px;
  width: 60px;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 50%;
  cursor: pointer;
  opacity:0;
}

input[type=range]::-moz-range-thumb {
  height: 60px;
  width: 60px;
  appearance: none;
  border-radius: 50%;
  cursor: pointer;
  opacity:0;
}

/* Range value (label) inside of range thumb */
.range-value {
  width: 50px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  color: #fff;
  background: rgb(0,12,110);
  font-size: 18px;
  position: absolute;
  transform:translateX(-50%);
  top: 45px;
  border-radius: 50%;
  user-select: none;
  select: none;
  pointer-events: none;
}

<div class="range-wrap">
  <!-- Ticks (lines) over slider -->
  <div class="ticks" id="tickContainer">
  </div>
  <!-- Range value inside of range thumb -->
  <div class="range-value" id="rangeValue"></div>
  <!-- Range itself -->
  <input id="range" type="range" min="1" max="100" value="5" step="1">
</div>

UPDATE

The final version used by the OP:

// Position of span that shows range value and tick curve position
const tickContainer = document.querySelector('.range-wrap');

const range = document.getElementById('range');
const rangeV = document.getElementById('rangeValue');
const setValue = () => {
  // Span position and inner value
  const newValue = Number((range.value - range.min) * 100 / (range.max - range.min));
  const newPosition = 30 - (newValue * 0.6);
  rangeV.style.left = `calc(${newValue}% + (${newPosition}px))`;
  rangeV.innerHTML = `${range.value}%`;
  
  // Tick curve position
  tickContainer.style.setProperty('--p', `calc(${newValue}%)`);
};

// Initialize setValue onload and oninput
document.addEventListener("DOMContentLoaded", setValue);
range.addEventListener('input', setValue);

body {
  font-family: Arial;
  margin: 0;
  min-height: 100vh;
  padding: 50px;
  box-sizing: border-box;
  text-align:center;
}

.range-wrap {
  position: relative;
  --svg:url("data:image/svg+xml;utf8, <svg width='97' height='37' viewBox='0 1.5 97 37' xmlns='http://www.w3.org/2000/svg'><path d='M0 35C14 35 13 2 48.5 2C84 2 80.5 35 97 35' fill='none' stroke='white' stroke-width='4'/></svg>") var(--p,0) 0;
</svg>
}

/* Styling of ticks (lines) over the range */
.ticks {
  --sw:120px; /* control the width of the curve */
  
  position: absolute;
  left: -30px;
  right: -30px;
  top: 0px;
  padding:0 10px;
  height: 50px;
  background: repeating-linear-gradient(to right, #D3D3D3 0 1px, transparent 1px 10px) content-box;
  -webkit-mask:var(--svg) /var(--sw) 50px,
     linear-gradient(to right, #fff calc(50% - var(--sw)/2 + 1px), transparent 0 calc(50% + var(--sw)/2 - 1px), #fff 0) 
     right var(--p) top 38px/calc(200% - var(--sw)) 6px;
  -webkit-mask-repeat:no-repeat;
  z-index:999;
}

/* Styling the range */
input[type=range] {
  --sw:100px; /* control the width of the curve */
  
  -webkit-appearance: none;
  appearance: none;
  margin: 20px 0 20px -20px;
  padding:0 20px;
  width: 100%;
  height: 60px;
  -webkit-mask: 
    var(--svg) /var(--sw) 41px,
    linear-gradient(to right, #fff calc(50% - var(--sw)/2 + 1px), transparent 0 calc(50% + var(--sw)/2  - 1px), #fff 0) 
    right var(--p) top 34.45px/calc(200% - var(--sw)) 4px;
  -webkit-mask-repeat:no-repeat;
  background: linear-gradient(125deg, #e0e0e0 34%, rgb(0,12,110) 100%);
  outline: none;
}

/* Range track */
input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 50px;
  cursor: pointer;
  border-radius: 25px;
}

input[type=range]::-moz-range-track {
  width: 100%;
  height: 50px;
  cursor: pointer;
  border-radius: 25px;
}

/* Range thumb */
input[type=range]::-webkit-slider-thumb {
  height: 60px;
  width: 60px;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 50%;
  cursor: pointer;
  opacity:0;
}

input[type=range]::-moz-range-thumb {
  height: 60px;
  width: 60px;
  appearance: none;
  border-radius: 50%;
  cursor: pointer;
  opacity:0;
}

/* Range value (label) inside of range thumb */
.range-value {
  width: 55px;
  height: 55px;
  line-height: 60px;
  text-align: center;
  color: #fff;
  background: rgb(0,12,110);
  font-size: 18px;
  position: absolute;
  transform:translateX(-50%);
  top: 32px;
  border-radius: 50%;
  user-select: none;
  select: none;
  pointer-events: none;
}

<h2>Custom range slider with ticks</h2>

<div class="range-wrap">
  <!-- Ticks (lines) over slider -->
  <div class="ticks" id="tickContainer">
  </div>
  <!-- Range value inside of range thumb -->
  <div class="range-value" id="rangeValue"></div>
  <!-- Range itself -->
  <input id="range" type="range" min="1" max="100" value="5" step="1">
</div>