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Babel includes JSX processing.

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HTML

              
                <button id="run">PROCESS</button>
<button id="reset">RESET</button>
<button id="play">REPLAY</button>

<!-- Straight lines won't draw in this version -->
<!-- <svg id="main" xmlns="http://www.w3.org/2000/svg" width="753.93" height="148.68" viewBox="0 0 753.93 148.68">
  <line id="bottom-line" x1="651.61" y1="123.7" x2="101.89" y2="123.7" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 10px"/>
  <polyline id="left-bracket" points="120.33 24.98 10.08 24.98 55.02 84.52 10.08 143.68 224.05 143.68" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 10px"/>
  <polyline id="right-bracket" points="633.17 24.98 743.8 24.98 698.48 84.52 743.8 143.68 529.45 143.68" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 10px"/>
  <line id="top-line" x1="101.89" y1="5" x2="651.61" y2="5" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 10px"/>
</svg> -->

<!-- Straight lines draw in this version of the above SVG -->
<svg xmlns="http://www.w3.org/2000/svg" width="753.93" height="148.68" viewBox="0 0 753.93 148.68">
  <path fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="10" d="M651.61 123.7H101.89M120.33 24.98H10.08l44.94 59.54-44.94 59.16h213.97M633.17 24.98H743.8l-45.32 59.54 45.32 59.16H529.45M101.89 5h549.72"/>
</svg>

<!-- Straight lines won't draw -->
<!-- <svg xmlns="http://www.w3.org/2000/svg" width="256" height="44" viewBox="0 0 256 44">
  <title>straight-lines</title>
  <line x1="4" y1="40" x2="252" y2="40" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="8"/>
  <line x1="4" y1="4" x2="252" y2="4" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="8"/>
</svg> -->

<!-- this version of the above works! -->
<!-- <svg xmlns="http://www.w3.org/2000/svg" width="256" height="44" viewBox="0 0 256 44">
  <title>
    straight-lines
  </title>
  <path fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="8" d="M4 40h248M4 4h248"/>
</svg> -->





<!-- Straight lines won't draw -->
<!-- <svg id="main" xmlns="http://www.w3.org/2000/svg" width="301.16" height="76.6" viewBox="0 0 301.16 76.6">
  <title>mid-circle-long</title>
  <circle id="middle" cx="150.52" cy="38.3" r="36.8" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 3px"/>
  <g id="left">
    <polyline id="bracket" points="111.12 20.8 3.02 20.8 14.72 36.2 3.02 51.7 31.12 51.7" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 3px"/>
    <line id="top-line" x1="109.12" y1="24.8" x2="21.02" y2="24.8" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 3px"/>
    <line id="bottom-line" x1="112.12" y1="55.8" x2="24.02" y2="55.8" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 3px"/>
  </g>
  <g id="right">
    <polyline id="bracket-2" data-name="bracket" points="190.02 20.8 298.12 20.8 286.32 36.2 298.12 51.7 270.02 51.7" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 3px"/>
    <line id="top-line-2" data-name="top-line" x1="192.02" y1="24.8" x2="280.12" y2="24.8" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 3px"/>
    <line id="bottom-line-2" data-name="bottom-line" x1="189.02" y1="55.8" x2="277.12" y2="55.8" style="fill: none;stroke: #000;stroke-linecap: round;stroke-miterlimit: 10;stroke-width: 3px"/>
  </g>
</svg> -->

<!-- This works where the version commented out above doesn't -->
<!-- <svg xmlns="http://www.w3.org/2000/svg" width="301.16" height="76.6" viewBox="0 0 301.16 76.6">
  <title>
    box
  </title>
  <circle cx="150.52" cy="38.3" r="36.8" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3"/>
  <path d="M111.12 20.8H3l11.7 15.4L3 51.7h28.1m78-26.9H21m91.1 31H24M190 20.8h108.1l-11.8 15.4 11.8 15.5H270M192 24.8h88.1M189 55.8h88.1" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3"/>
</svg> -->




<!-- These all work fine -->
<!-- <svg width="100%">
  <defs>
    <path stroke-width="30" fill="none" class="path" d="M100,80c150,150,250,-150,400,0" />
</defs>
</svg>
 -->

<!-- <svg xmlns="http://www.w3.org/2000/svg" width="170" height="170" viewBox="0 0 170 170">
  <title>
    alphabet
  </title>
  <path d="M85 2.5A82.51 82.51 0 0 0 22.1 138.4l-8.3 25.5 24.1-11.3A82.35 82.35 0 0 0 167.5 85M167.5 85V81.4" style="fill: none;stroke: #282d33;stroke-width: 5px"/>
  <path d="M166.8,74.2A82.46,82.46,0,0,0,92.2,2.8" style="fill: none;stroke: #282d33;stroke-width: 5px;stroke-dasharray: 4.002299785614014,4.002299785614014"/>
  <path d="M88.6,2.7H85" style="fill: none;stroke: #282d33;stroke-width: 5px"/>
  <g>
    <path d="M72.8,83H88.1a12.25,12.25,0,0,1,12.2,12.2h0a12.25,12.25,0,0,1-12.2,12.2H71" style="fill: none;stroke: #282d33;stroke-width: 5px"/>
    <path d="M70.8 62.3h13A10.39 10.39 0 0 1 94.2 72.7h0A10.39 10.39 0 0 1 83.8 83.1h-11M73.5 58.9L73.5 111" style="fill: none;stroke: #282d33;stroke-width: 5px"/>
    <g>
      <path d="M37.6 111V73.3A11.14 11.14 0 0 1 48.7 62.2h0A11.14 11.14 0 0 1 59.8 73.3V111M60.2 82.3L38.3 82.3" style="fill: none;stroke: #282d33;stroke-width: 5px"/>
    </g>
    <path d="M132.5,98.1a11,11,0,0,1-11,11h0a11,11,0,0,1-11-11V73a11,11,0,0,1,11-11h0a11,11,0,0,1,11,11" style="fill: none;stroke: #282d33;stroke-width: 5px"/>
  </g>
</svg> -->


<!-- <svg id="Layer_1" xmlns="http://www.w3.org/2000/svg" width="170" height="170" viewBox="-314 316 170 170">
  <style>
    .st0{fill:none;stroke:#282D33;stroke-width:5;stroke-dasharray:4;} .st1{fill:none;stroke:#282D33;stroke-width:5;} .st2{fill:none;stroke:#282D33;stroke-width:5;stroke-dasharray:4.2121,4.2121;}
  </style>
  <g id="Icons">
    <path stroke-dasharray="4" class="st0" d="M-191.3 345c-11.9-7.2-25.9-11.3-40.8-11.3-43.7 0-79.1 35.4-79.1 79.1M-153 412.7c0-14.2-3.7-27.5-10.3-39"/>
    <path class="st1" d="M-289.1 403.3l2.7-16.4h87.9l9.2 16.7"/>
    <path stroke-dasharray="4.2121,4.2121" class="st2" d="M-277.4 399.2h71"/>
    <path class="st1" d="M-300.3 424.1l3.6-18.4h117.1l12.2 20.6M-183.5 370c0-6.8 5.5-12.4 12.4-12.4 6.8 0 12.4 5.5 12.4 12.4"/>
    <path class="st1" d="M-208.1 370c0-6.8 5.5-12.4 12.4-12.4 6.8 0 12.4 5.5 12.4 12.4M-233.8 359.5c0-4.1 3.4-7.5 7.5-7.5M-241.2 352c4.1 0 7.5 3.4 7.5 7.5M-207.9 425.2l-1.8 6.8H-290l-1.8-6.8h-19.7l9.8 43.2h104c25.7 0 47-18.7 51.2-43.2h-61.4z"/>
    <g>
      <path stroke-dasharray="4.2121,4.2121" class="st2" d="M-284.5 418.1h71"/>
    </g>
  </g>
</svg>
 -->

<!-- 
<svg id="Layer_1" xmlns="http://www.w3.org/2000/svg" width="170" height="170" viewBox="-314 316 170 170">
  <style>
    .st0{fill:none;stroke:#282D33;stroke-width:5;} .st1{fill:none;stroke:#282D33;stroke-width:5;stroke-dasharray:3.9777,3.9777;}
  </style>
  <g id="Icons">
    <path class="st0" d="M-311.5 401c0-1.1 0-2.2.1-3.3"/>
    <path class="st1" stroke-dasharray="3.9777,3.9777" d="M-310.9 391.3c4.8-41 39.7-72.8 81.9-72.8 43.4 0 78.9 33.5 82.2 76"/>
    <path class="st0" d="M-146.6 397.7c0 1.1.1 2.2.1 3.3M-146.5 401c0 45.6-36.9 82.5-82.5 82.5s-82.5-36.9-82.5-82.5"/>
    <g>
      <path class="st0" d="M-269 411.7h-12c0 24.3 23.3 44 52 44s52-19.7 52-44h-12"/>
      <circle class="st0" cx="-229" cy="356.6" r="11.6"/>
      <path class="st0" d="M-229 456.7v-88.5M-246.5 390.7h35"/>
    </g>
  </g>
</svg> -->
<!-- 
<svg xmlns="http://www.w3.org/2000/svg" width="168.4" height="44.3" viewBox="0 0 168.4 44.3">
  <path fill="none" stroke="#000" stroke-width="3" stroke-linecap="round" stroke-miterlimit="10" d="M73.7 8.6H5.6l11.7 15.5L5.6 39.5h98.1"/>
  <path fill="none" stroke="#000" stroke-width="3" stroke-linecap="round" stroke-miterlimit="10" d="M22.6 4.6h128.1l13.2 15.5-13.2 15.4H52.6"/>
</svg> -->


<!-- <svg xmlns="http://www.w3.org/2000/svg" width="172.57" height="162.9" viewBox="0 0 172.57 162.9">
  <title>
    hand-pencil
  </title>
  <path d="M38.9 46.3V53l23.3 27.1a24.07 24.07 0 0 0 9.8 5.4v5.2" fill="none" stroke="#282d33" stroke-width="5px"/>
  <path d="M55.1 50V29.4a12.29 12.29 0 0 0-12.3-12.3h-4.1v11.5" fill="none" stroke="#282d33" stroke-width="5px"/>
  <path d="M10 29H3.9a1.55 1.55 0 0 0-1.4 1.6v12.1a1.68 1.68 0 0 0 1.4 1.8H10" fill="none" stroke="#282d33" stroke-width="5px"/>
  <path fill="none" stroke="#282d33" stroke-width="5px" d="M150.7 28.7h2.5l14.3 8.1-14.3 8.1h-2.5"/>
  <path fill="none" stroke="#282d33" stroke-width="5px" d="M120.4 46.5h30.7V27h-30.7"/>
  <path fill="none" stroke="#282d33" stroke-width="5px" d="M53.3 27H13v19.5h40.3"/>
  <path d="M38.9 49.2V53l23.3 27.1a24.07 24.07 0 0 0 9.8 5.4v5.2" fill="none" stroke="#282d33" stroke-width="5px"/>
  <path d="M112.3 90.7v-8.9a21.88 21.88 0 0 0 8.6-17.3V27l-.3-8.3a8.07 8.07 0 0 0-8.1-8.1c-4.5 0-8.1 1.6-8.1 6v-2a8.1 8.1 0 1 0-16.2 0v-4a8.1 8.1 0 0 0-16.2 0v4.5c0-3.8-3.8-7.8-8.5-7.8a8.28 8.28 0 0 0-8.3 8.3V50" fill="none" stroke="#282d33" stroke-width="5px"/>
  <path fill="none" stroke="#282d33" stroke-width="5px" d="M66.9 162.9v-66h66.5v66"/>
  <path fill="none" stroke="#282d33" stroke-width="5px" d="M66.9 162.9v-66h66.5v66"/>
  <path fill="none" stroke="#282d33" stroke-width="5px" d="M123.5 108.2v7.2"/>
</svg> -->
  
              
            
!

CSS

              
                html, body
  height: 100%

body
  overflow: hidden
  background: #fff

svg
  position: absolute
  top: 40px
  left: 0
  // background: #fff


svg 
  defs .path, .mask-path
    fill: none
    stroke: #fff

button
  position: relative
  font-size: 18px
  display: inline-block
  width: 200px
  margin: 0 auto

              
            
!

JS

              
                MorphSVGPlugin.convertToPath("circle, rect, ellipse, line, polygon, polyline");
TweenLite.defaultEase = Linear.easeNone;
var xmlns = "http://www.w3.org/2000/svg";
var colors = ["#EA4335", "#FBBC05", "#34A853", "#4285F4"];
var svgns = "http://www.w3.org/2000/svg";
var root = document.querySelector("svg");
var selectorsArr = document.querySelectorAll("path");
var initialContents = root.innerHTML;
var masterTL = new TimelineMax();
defsWrap();

var space = 1;
var total = colors.length;
var ratio = 1 / total;
var loops = 2;
var time = 2;

function defsWrap() {
  // wrap all the converted paths in a defs container
  var defs = document.createElementNS (xmlns, "defs");
  root.appendChild(defs);
  $(root).find('g').detach().appendTo(defs);
  $(root).find('path').not('g path').detach().appendTo(defs);
}

function addMasks() {
  var cnt = 0;
  
  for ( path of selectorsArr ) {
    
    var newMask = document.createElementNS (xmlns, "mask");
    newMask.setAttributeNS(null, "id", `mask-${cnt}`);
    
    var maskPath = path.cloneNode(true);
    var pathClass = (maskPath.getAttribute('class') !== null) ? maskPath.getAttribute('class') + ' mask-path' : 'mask-path';
    maskPath.setAttributeNS(null,'class',pathClass);
    maskPath.style.stroke = "#fff";
    
    path.setAttributeNS(null,'id', `path-${cnt}`);
    path.setAttributeNS(null,'mask', `mask-${cnt}`);
    
    newMask.appendChild(maskPath);
    root.appendChild(newMask);
    cnt++;
  }
}


function inAndOut() {

  for ( let path of selectorsArr ) {

    var mask = document.getElementById(path.getAttribute('mask'));
    var length = path.getTotalLength();
    console.log(path.getAttribute('stroke-width'));
    console.log(parseInt(path.style.strokeWidth));
    var strokeWidth = ( path.getAttribute('stroke-width') !== null ) ? path.getAttribute('stroke-width') : parseInt(path.style.strokeWidth);
    strokeWidth = ( isNaN(strokeWidth) ) ? parseInt($(path).css('stroke-width')) : strokeWidth;
    length += (strokeWidth*2);
    var offset = length / total;
    var pathID = path.id;
    // check for dasharray setting
    var dashArray = path.getAttribute('stroke-dasharray');
    if(dashArray === null ) {
      // check for css style
      dashArray = ( $(path).css('stroke-dasharray') !== 'none' ) ? $(path).css('stroke-dasharray') : null;
    }
    var strokeDashArraySetting = `${offset + space},${length - offset - space}`;
    if( dashArray !== null ) {
      dashArray = dashArray.split(",");
      for( var i=0; i<dashArray.length; i++ ) {
        dashArray[i] = parseFloat(dashArray[i]);
      }
      var dash = getDash(dashArray, length);
      strokeDashArraySetting = `${dash},${length}`
    }

    TweenLite.set(path, { strokeDasharray: strokeDashArraySetting });
    
    var tl = colors.reduce((tl, stroke, i) => {
    
      var hideRatio = 1 - ratio * i;
      var hideStep = 100 - 100 * hideRatio;
      var hideTime = time * hideRatio;

      var maskClone = mask.cloneNode(true);
      var pathClone = path.cloneNode(true);
      pathClone.removeAttribute('id');
      var maskPath = maskClone.querySelector(".mask-path");  
      var maskID = `url(#${maskClone.id = pathID + "-mask" + i})`;

      root.appendChild(maskClone);
      root.appendChild(pathClone);

      TweenLite.set(pathClone, { attr: { mask: maskID }, stroke, strokeDashoffset: -i * offset });
      TweenLite.set(maskPath, { drawSVG: 0 });

      tl.to(maskPath, time, { drawSVG: true }, 0)
        .to(pathClone, time, { strokeDashoffset: `-=${length}`, repeat: loops }, 0)
        .set(maskPath, { drawSVG: `${hideStep}% 100%` }, "hide")
        .to(maskPath, hideTime, { drawSVG: "100% 100%" }, "hide");
      
      masterTL.add(tl,0);
      return tl;

    }, new TimelineMax());
  }
}

function getDash(pattern, length) {

  var dash = [];
  var full = false;       
  var len  = pattern.length;
  var sum  = 0; 

  while (!full) {        
    for (var i = 0; i < len; i++) {
      var val = pattern[i];
      if (sum + val >= length) {
        full = true; break;                
      }
      sum += val;
      dash.push(val)
    }
  }    

  var last = length - sum;
  dash.length % 2 ? dash.push(0, last, length) : dash.push(last, length);
  return dash;
}

$('button#run').on("click", function(){
  console.clear();
  addMasks();
  inAndOut();
});

$('button#play').on("click", function(){
  masterTL.seek(0).play();
});

$('button#reset').on("click", function(){
  root.innerHTML = initialContents;
  MorphSVGPlugin.convertToPath("circle, rect, ellipse, line, polygon, polyline");
  root = document.querySelector("svg");
  selectorsArr = document.querySelectorAll("path");
  defsWrap();
});

              
            
!
999px

Console