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              <svg viewBox="0 0 100 20">
  <line x1=10 y1=10 x2=90 y2=10 stroke-width=6 stroke="#FF5722" stroke-linecap=round></line>
  <line x1=0 y1=10 x2=90 y2=10 stroke-width=1 stroke="black" stroke-linecap=round></line>
</svg>
            
          
!
            
              "use strict";

const COLORS = ["rgb(244, 67, 54)","rgb(0, 150, 136)","rgb(96, 125, 139)","rgb(156, 39, 176)","rgb(103, 58, 183)","rgb(63, 81, 181)","rgb(33, 150, 243)","rgb(3, 169, 244)","rgb(0, 188, 212)","rgb(76, 175, 80)","rgb(139, 195, 74)","rgb(255, 193, 7)","rgb(255, 152, 0)","rgb(255, 87, 34)","rgb(233, 30, 99)","rgb(121, 85, 72)"];

var svg = document.querySelector('svg');
  var groups = [];

run();

function getX(){
  return (10 + Math.random()*80);
}

function run(){
  var waitDelay = 500;

  drawCircleEntries()
    .then(function(){
      return new Promise(function(r){
        setTimeout(() => r(), waitDelay);
      });
    })
    .then(function(){
      return drawGroupOutlines();
    })
    .then(function(){
      return new Promise(function(r){
        setTimeout(() => r(), waitDelay);
      });
    })
    .then(function(){
      return drawGroupRectangles();
    })
    .then(function(data){
      return new Promise(function(r){
        setTimeout(() => r(data), waitDelay);
      });
    })
    .then(function(data){
      return drawGroupClipPath(data);
    }, function(err){
      console.warn(err);
    })
    .then(function(){
      return new Promise(function(r){
        setTimeout(() => r(), waitDelay);
      });
    })
    .then(function(){
      return drawGroupStroke();
    })
    .then(function(){
      return new Promise(function(r){
        setTimeout(() => r(), waitDelay * 4);
      });
    })
    .then(function(){
      return clear();
    })
    .then(run)
  .catch(function(ex){
    console.error(ex);
  });  
}

function drawCircleEntries(){
    var circlesGroup = document.createElementNS("http://www.w3.org/2000/svg", "g");
    svg.appendChild(circlesGroup);
    var insertPromises = [];
    for(var i = 0; i<(10 + Math.random() * 10); i++){
      var colorIndex = (i % (COLORS.length - 1));
      var bugColor = COLORS[colorIndex];
      let circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
      circle.classList.add('entry');
      circle.setAttribute('cx',getX());
      circle.setAttribute('cy', 10);
      circle.setAttribute('r', 2);
      circle.setAttribute('stroke-width', .2);
      circle.setAttribute('stroke', 'black');
      circle.setAttribute('fill', bugColor);
      let insertPromise = function(){
        return new Promise(function(resolve){
          setTimeout(function(){
            circlesGroup.appendChild(circle);
            resolve();
          }, i * 100);
        });
      }
      insertPromises.push(insertPromise());
    }
    return Promise.all(insertPromises);
}

function drawGroupOutlines(){
  var circles = Array.from(document.querySelectorAll('circle'));
  circles.sort(function(a, b){
    return (parseFloat(a.getAttribute('cx')) - parseFloat(b.getAttribute('cx')));
  });
  circles.reduce(function(previousValue, currentValue, currentIndex, array){
    if(groups.length > 0 && previousValue && parseFloat(currentValue.getAttribute('cx')) - parseFloat(previousValue.getAttribute('cx')) < 4){
      groups[groups.length - 1].push(currentValue);              
    } else {
      groups.push([currentValue]);
    }
    return currentValue;
  }, null);

  let insertPromises = [];
  let outlineGroup = document.createElementNS("http://www.w3.org/2000/svg", "g");
  outlineGroup.setAttribute('class','outline-group');
  svg.appendChild(outlineGroup);
  groups.forEach(function(group, index){
    let rect = document.createElementNS("http://www.w3.org/2000/svg", "rect");
    var start = parseFloat(group[0].getAttribute('cx')) - 2;
    var end = parseFloat((group[group.length - 1]).getAttribute('cx')) + 2;

    rect.setAttribute('x', start);
    rect.setAttribute('width', end - start);
    rect.setAttribute('y', 5);
    rect.setAttribute('height', 10) ;
    rect.setAttribute('stroke', 'green');
    rect.setAttribute('stroke-width', .2);
    rect.setAttribute('fill', 'transparent');
    let insertPromise = function(){
      return new Promise(function(resolve){
        setTimeout(function(){
          outlineGroup.appendChild(rect);
          resolve();
        }, index * 100);
      });
    }
    insertPromises.push(insertPromise());    
  });
  
  return Promise.all(insertPromises);
}

function drawGroupRectangles(){
  let insertPromises = [];
  let rectanglesGroup = document.createElementNS("http://www.w3.org/2000/svg", "g");
  rectanglesGroup.setAttribute('class','rectangles-group');
  svg.appendChild(rectanglesGroup);
  
  groups.forEach(function(group, groupIndex){
    var start = parseFloat(group[0].getAttribute('cx')) - 2;
    var end = parseFloat((group[group.length - 1]).getAttribute('cx')) + 2;
    var width = (end - start)/ group.length;

    let clipId = 'group-'+groupIndex;
    var groupClipath = document.createElementNS("http://www.w3.org/2000/svg", "clipPath");
    groupClipath.setAttribute('id',clipId);
    var startCircleClip = document.createElementNS("http://www.w3.org/2000/svg", "circle");
    startCircleClip.setAttribute('cx',start + 2);
    startCircleClip.setAttribute('cy',10);
    startCircleClip.setAttribute('r',2);

    var endCircleClip = document.createElementNS("http://www.w3.org/2000/svg", "circle");
    endCircleClip.setAttribute('cx',end - 2);
    endCircleClip.setAttribute('cy',10);
    endCircleClip.setAttribute('r',2);

    var rectClip = document.createElementNS("http://www.w3.org/2000/svg", "rect");
    rectClip.setAttribute("x",start + 2);
    rectClip.setAttribute("y",8 );
    rectClip.setAttribute("height",4);
    rectClip.setAttribute("width", (end - 2) - (start  + 2));

    groupClipath.appendChild(startCircleClip);
    groupClipath.appendChild(endCircleClip);
    groupClipath.appendChild(rectClip);
    svg.appendChild(groupClipath);
    
    group.forEach(function(entry,index){
      let rect = document.createElementNS("http://www.w3.org/2000/svg", "rect");
      rect.setAttribute('x', start + (width * index));
      rect.setAttribute('width', width);
      rect.setAttribute('y', 5);
      rect.setAttribute('height', 10) ;
      rect.setAttribute('fill', entry.getAttribute('fill'));
      rect.setAttribute('stroke', 'black');
      rect.setAttribute('stroke-width', .1);

      let outline = document.createElementNS("http://www.w3.org/2000/svg", "line");
      outline.setAttribute('class','group-outline');
      outline.setAttribute('opacity',0);
      outline.setAttribute('x1', start + 2);
      outline.setAttribute('y1', 10);
      outline.setAttribute('x2', end - 2);
      outline.setAttribute('y2', 10);
      outline.setAttribute('stroke', 'black');
      outline.setAttribute('stroke-width', 4.6);
      outline.setAttribute('stroke-linecap', 'round');
      svg.insertBefore(outline, svg.children[1]);      
      
      let insertPromise = function(){
        return new Promise(function(resolve){
          setTimeout(function(){
            rectanglesGroup.appendChild(rect);
            resolve({
              clip: groupClipath,
              element: rect
            });
          }, index * 100);
        });
      }
      insertPromises.push(insertPromise());  
    });  
  });
  
  return Promise.all(insertPromises);
}

function drawGroupClipPath(data){
  Array.from(document.querySelectorAll('.outline-group, circle.entry')).forEach(function(g){
    g.remove();
  });
  let promises = [];
  data.forEach(function(obj, index){
    let p = function(){
      return new Promise(function(resolve){
        setTimeout(function(){
          obj.element.setAttribute('clip-path',`url(#${obj.clip.getAttribute('id')})`);
          resolve();
        }, index * 100);
      });
    }
    promises.push(p());  
  });
  return Promise.all(promises);
}

function drawGroupStroke(){
  let promises = [];
  Array.from(document.querySelectorAll('.group-outline')).forEach(function(el, index){
    let p = function(){
      return new Promise(function(resolve){
        setTimeout(function(){
          el.setAttribute('opacity', 1);
          resolve();
        }, index * 50);
      });
    }
    promises.push(p());  
  });
  return Promise.all(promises);
}

function clear(){
  groups = [];
  Array.from(svg.querySelectorAll('.group-outline, .rectangles-group, circles, clipPath')).forEach(function(el, index){
    el.remove();
  });
}
            
          
!
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