Download Button Animation

  <div class="container">

    <a href="" class="button">
        <ul>
            <li>&#68;ownload</li>
            <li>&#68;ownloading</li>
            <li>Open File</li>
        </ul>
        <div>
            <svg viewBox="0 0 24 24"></svg>
        </div>
    </a>

    <a href="" class="button dark-single">
        <div>
            <svg viewBox="0 0 24 24"></svg>
        </div>
    </a>

    <div></div>

    <a href="" class="button white-single">
        <div>
            <svg viewBox="0 0 24 24"></svg>
        </div>
    </a>

    <a href="" class="button dark">
        <ul>
            <li>&#68;ownload</li>
            <li>&#68;ownloading</li>
            <li>Open File</li>
        </ul>
        <div>
            <svg viewBox="0 0 24 24"></svg>
        </div>
    </a>

</div>

.button.dark-single {
	--background: none;
	--rectangle: #242836;
	--success: #4BC793;
  }
  .button.white-single {
	--background: none;
	--rectangle: #F5F9FF;
	--arrow: #275efe;
	--success: #275efe;
	--shadow: rgba(10, 22, 50, .1);
  }
  .button.dark {
	--background: #242836;
	--rectangle: #1C212E;
	--arrow: #F5F9FF;
	--text: #F5F9FF;
	--success: #2F3545;
  }
  
  .button {
	--background: #275efe;
	--rectangle: #184fee;
	--success: #4672f1;
	--text: #fff;
	--arrow: #fff;
	--checkmark: #fff;
	--shadow: rgba(10, 22, 50, .24);
	display: flex;
	overflow: hidden;
	text-decoration: none;
	-webkit-mask-image: -webkit-radial-gradient(white, black);
	background: var(--background);
	border-radius: 8px;
	box-shadow: 0 2px 8px -1px var(--shadow);
	transition: transform 0.2s ease, box-shadow 0.2s ease;
  }
  .button:active {
	transform: scale(0.95);
	box-shadow: 0 1px 4px -1px var(--shadow);
  }
  .button ul {
	margin: 0;
	padding: 16px 40px;
	list-style: none;
	text-align: center;
	position: relative;
	-webkit-backface-visibility: hidden;
			backface-visibility: hidden;
	font-size: 16px;
	font-weight: 500;
	line-height: 28px;
	color: var(--text);
  }
  .button ul li:not(:first-child) {
	top: 16px;
	left: 0;
	right: 0;
	position: absolute;
  }
  .button ul li:nth-child(2) {
	top: 76px;
  }
  .button ul li:nth-child(3) {
	top: 136px;
  }
  .button > div {
	position: relative;
	width: 60px;
	height: 60px;
	background: var(--rectangle);
  }
  .button > div:before, .button > div:after {
	content: "";
	display: block;
	position: absolute;
  }
  .button > div:before {
	border-radius: 1px;
	width: 2px;
	top: 50%;
	left: 50%;
	height: 17px;
	margin: -9px 0 0 -1px;
	background: var(--arrow);
  }
  .button > div:after {
	width: 60px;
	height: 60px;
	transform-origin: 50% 0;
	border-radius: 0 0 80% 80%;
	background: var(--success);
	top: 0;
	left: 0;
	transform: scaleY(0);
  }
  .button > div svg {
	display: block;
	position: absolute;
	width: 20px;
	height: 20px;
	left: 50%;
	top: 50%;
	margin: -9px 0 0 -10px;
	fill: none;
	z-index: 1;
	stroke-width: 2px;
	stroke: var(--arrow);
	stroke-linecap: round;
	stroke-linejoin: round;
  }
  .button.loading ul {
	-webkit-animation: text calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
			animation: text calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
  }
  .button.loading > div:before {
	-webkit-animation: line calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
			animation: line calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
  }
  .button.loading > div:after {
	-webkit-animation: background calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
			animation: background calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
  }
  .button.loading > div svg {
	-webkit-animation: svg calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
			animation: svg calc(var(--duration) * 1ms) linear forwards calc(var(--duration) * .065ms);
  }
  
  @-webkit-keyframes text {
	10%, 85% {
	  transform: translateY(-100%);
	}
	95%, 100% {
	  transform: translateY(-200%);
	}
  }
  
  @keyframes text {
	10%, 85% {
	  transform: translateY(-100%);
	}
	95%, 100% {
	  transform: translateY(-200%);
	}
  }
  @-webkit-keyframes line {
	5%, 10% {
	  transform: translateY(-30px);
	}
	40% {
	  transform: translateY(-20px);
	}
	65% {
	  transform: translateY(0);
	}
	75%, 100% {
	  transform: translateY(30px);
	}
  }
  @keyframes line {
	5%, 10% {
	  transform: translateY(-30px);
	}
	40% {
	  transform: translateY(-20px);
	}
	65% {
	  transform: translateY(0);
	}
	75%, 100% {
	  transform: translateY(30px);
	}
  }
  @-webkit-keyframes svg {
	0%, 20% {
	  stroke-dasharray: 0;
	  stroke-dashoffset: 0;
	}
	21%, 89% {
	  stroke-dasharray: 26px;
	  stroke-dashoffset: 26px;
	  stroke-width: 3px;
	  margin: -10px 0 0 -10px;
	  stroke: var(--checkmark);
	}
	100% {
	  stroke-dasharray: 26px;
	  stroke-dashoffset: 0;
	  margin: -10px 0 0 -10px;
	  stroke: var(--checkmark);
	}
	12% {
	  opacity: 1;
	}
	20%, 89% {
	  opacity: 0;
	}
	90%, 100% {
	  opacity: 1;
	}
  }
  @keyframes svg {
	0%, 20% {
	  stroke-dasharray: 0;
	  stroke-dashoffset: 0;
	}
	21%, 89% {
	  stroke-dasharray: 26px;
	  stroke-dashoffset: 26px;
	  stroke-width: 3px;
	  margin: -10px 0 0 -10px;
	  stroke: var(--checkmark);
	}
	100% {
	  stroke-dasharray: 26px;
	  stroke-dashoffset: 0;
	  margin: -10px 0 0 -10px;
	  stroke: var(--checkmark);
	}
	12% {
	  opacity: 1;
	}
	20%, 89% {
	  opacity: 0;
	}
	90%, 100% {
	  opacity: 1;
	}
  }
  @-webkit-keyframes background {
	10% {
	  transform: scaleY(0);
	}
	40% {
	  transform: scaleY(0.15);
	}
	65% {
	  transform: scaleY(0.5);
	  border-radius: 0 0 50% 50%;
	}
	75% {
	  border-radius: 0 0 50% 50%;
	}
	90%, 100% {
	  border-radius: 0;
	}
	75%, 100% {
	  transform: scaleY(1);
	}
  }
  @keyframes background {
	10% {
	  transform: scaleY(0);
	}
	40% {
	  transform: scaleY(0.15);
	}
	65% {
	  transform: scaleY(0.5);
	  border-radius: 0 0 50% 50%;
	}
	75% {
	  border-radius: 0 0 50% 50%;
	}
	90%, 100% {
	  border-radius: 0;
	}
	75%, 100% {
	  transform: scaleY(1);
	}
  }
  html {
	box-sizing: border-box;
	-webkit-font-smoothing: antialiased;
  }
  
  * {
	box-sizing: inherit;
  }
  *:before, *:after {
	box-sizing: inherit;
  }
  
  body {
	min-height: 100vh;
	display: flex;
	font-family: "Roboto", Arial;
	justify-content: center;
	align-items: center;
	background: #E4ECFA;
  }
  body .container {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
  }
  body .container > div {
	flex-basis: 100%;
	width: 0;
  }
  body .container .button {
	margin: 16px;
  }
  @media (max-width: 400px) {
	body .container .button {
	  margin: 12px;
	}
  }
  body .dribbble {
	position: fixed;
	display: block;
	right: 20px;
	bottom: 20px;
  }
  body .dribbble img {
	display: block;
	height: 28px;
  }

document.querySelectorAll('.button').forEach(button => {

  let duration = 3000,
      svg = button.querySelector('svg'),
      svgPath = new Proxy({
          y: null,
          smoothing: null
      }, {
          set(target, key, value) {
              target[key] = value;
              if(target.y !== null && target.smoothing !== null) {
                  svg.innerHTML = getPath(target.y, target.smoothing, null);
              }
              return true;
          },
          get(target, key) {
              return target[key];
          }
      });

  button.style.setProperty('--duration', duration);

  svgPath.y = 20;
  svgPath.smoothing = 0;

  button.addEventListener('click', e => {
      
      e.preventDefault();

      if(!button.classList.contains('loading')) {

          button.classList.add('loading');

          gsap.to(svgPath, {
              smoothing: .3,
              duration: duration * .065 / 1000
          });

          gsap.to(svgPath, {
              y: 12,
              duration: duration * .265 / 1000,
              delay: duration * .065 / 1000,
              ease: Elastic.easeOut.config(1.12, .4)
          });

          setTimeout(() => {
              svg.innerHTML = getPath(0, 0, [
                  [3, 14],
                  [8, 19],
                  [21, 6]
              ]);
          }, duration / 2);

      }

  });

});

function getPoint(point, i, a, smoothing) {
  let cp = (current, previous, next, reverse) => {
          let p = previous || current,
              n = next || current,
              o = {
                  length: Math.sqrt(Math.pow(n[0] - p[0], 2) + Math.pow(n[1] - p[1], 2)),
                  angle: Math.atan2(n[1] - p[1], n[0] - p[0])
              },
              angle = o.angle + (reverse ? Math.PI : 0),
              length = o.length * smoothing;
          return [current[0] + Math.cos(angle) * length, current[1] + Math.sin(angle) * length];
      },
      cps = cp(a[i - 1], a[i - 2], point, false),
      cpe = cp(point, a[i - 1], a[i + 1], true);
  return `C ${cps[0]},${cps[1]} ${cpe[0]},${cpe[1]} ${point[0]},${point[1]}`;
}

function getPath(update, smoothing, pointsNew) {
  let points = pointsNew ? pointsNew : [
          [4, 12],
          [12, update],
          [20, 12]
      ],
      d = points.reduce((acc, point, i, a) => i === 0 ? `M ${point[0]},${point[1]}` : `${acc} ${getPoint(point, i, a, smoothing)}`, '');
  return `<path d="${d}" />`;
}