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HTML

              
                <div id="svgContainer">
    <svg id="svg1" width="0" height="0" >
        <path id="path1"/>
        <path id="path2"/>
        <path id="path3"/>
        <path id="path4"/>
        <path id="path5"/>
        <path id="path6"/>  
    </svg>
</div>
<div id= "outer">
  <div id="teal"></div>
  <div id="red"></div>
  <div id="green"></div>
  <div id="purple"></div>
  <div id="orange"></div>
  <div id="aqua"></div>
</div>


<!--  Try to resize the screen -->
<!-- the connections should hold -->
              
            
!

CSS

              
                body{font-size: 1.5vh; }
div{  opacity: 0.7; }

#svgContainer { 
  z-index: -10;
  opacity:  0.5;
  margin:   2.5em 2.5em;
  position: absolute;  
  background-color: #999;  
}

path { 
  fill:   none;
  stroke: #000;
  stroke-width: 0.7em;
}

#path3 {stroke-width: 0.5em;}
#path5 {stroke-width: 0.8em;}
#path6 {stroke-width: 0.8em;}

#outer{
  width:  80%;
  margin: 0 auto;
}
#teal{
  width:  6em;
  height: 6em;
  margin-left: 10%;
  background-color: teal;
}

#orange{
  width:   35%;
  height:  4em;
  padding: 2em 8em;
  margin-top:  6em;
  margin-left: 8em;
  background-color: orange; 
}

#red{
  width:   6em;
  height:  4em;
  padding: 4em 3em;
  margin-left: 30%; 
  background-color: red;
}

#aqua{
	width:  5em;
	height: 5em;
	margin-left: 15%; 
	background-color: aqua;
}

#purple{
	width: 15em;
	height: 5em;
	background-color:purple;
}

#green{
	width:  5em;
	height: 7em;
	margin-top:  2em;
	margin-left: 50%;
	background-color: green;
}
              
            
!

JS

              
                //helper functions, it turned out chrome doesn't support Math.sgn() 
function signum(x) {
    return (x < 0) ? -1 : 1;
}
function absolute(x) {
    return (x < 0) ? -x : x;
}

function drawPath(svg, path, startX, startY, endX, endY) {
    // get the path's stroke width (if one wanted to be  really precize, one could use half the stroke size)
    var stroke =  parseFloat(path.css("stroke-width"));
    // check if the svg is big enough to draw the path, if not, set heigh/width
    if (svg.attr("height") <  endY)                 svg.attr("height", endY);
    if (svg.attr("width" ) < (startX + stroke) )    svg.attr("width", (startX + stroke));
    if (svg.attr("width" ) < (endX   + stroke) )    svg.attr("width", (endX   + stroke));
    
    var deltaX = (endX - startX) * 0.15;
    var deltaY = (endY - startY) * 0.15;
    // for further calculations which ever is the shortest distance
    var delta  =  deltaY < absolute(deltaX) ? deltaY : absolute(deltaX);

    // set sweep-flag (counter/clock-wise)
    // if start element is closer to the left edge,
    // draw the first arc counter-clockwise, and the second one clock-wise
    var arc1 = 0; var arc2 = 1;
    if (startX > endX) {
        arc1 = 1;
        arc2 = 0;
    }
    // draw tha pipe-like path
    // 1. move a bit down, 2. arch,  3. move a bit to the right, 4.arch, 5. move down to the end 
    path.attr("d",  "M"  + startX + " " + startY +
                    " V" + (startY + delta) +
                    " A" + delta + " " +  delta + " 0 0 " + arc1 + " " + (startX + delta*signum(deltaX)) + " " + (startY + 2*delta) +
                    " H" + (endX - delta*signum(deltaX)) + 
                    " A" + delta + " " +  delta + " 0 0 " + arc2 + " " + endX + " " + (startY + 3*delta) +
                    " V" + endY );
}

function connectElements(svg, path, startElem, endElem) {
    var svgContainer= $("#svgContainer");

    // if first element is lower than the second, swap!
    if(startElem.offset().top > endElem.offset().top){
        var temp = startElem;
        startElem = endElem;
        endElem = temp;
    }

    // get (top, left) corner coordinates of the svg container   
    var svgTop  = svgContainer.offset().top;
    var svgLeft = svgContainer.offset().left;

    // get (top, left) coordinates for the two elements
    var startCoord = startElem.offset();
    var endCoord   = endElem.offset();

    // calculate path's start (x,y)  coords
    // we want the x coordinate to visually result in the element's mid point
    var startX = startCoord.left + 0.5*startElem.outerWidth() - svgLeft;    // x = left offset + 0.5*width - svg's left offset
    var startY = startCoord.top  + startElem.outerHeight() - svgTop;        // y = top offset + height - svg's top offset

        // calculate path's end (x,y) coords
    var endX = endCoord.left + 0.5*endElem.outerWidth() - svgLeft;
    var endY = endCoord.top  - svgTop;

    // call function for drawing the path
    drawPath(svg, path, startX, startY, endX, endY);
}
function resetSVGsize(){
  $("#svg1").attr("height", "0");
  $("#svg1").attr("width", "0"); 
}


function connectAll() {
    // connect all the paths you want!
    connectElements($("#svg1"), $("#path1"), $("#teal"),   $("#orange"));
    connectElements($("#svg1"), $("#path2"), $("#red"),    $("#orange"));
    connectElements($("#svg1"), $("#path3"), $("#teal"),   $("#aqua")  );
    connectElements($("#svg1"), $("#path4"), $("#red"),    $("#aqua")  ); 
    connectElements($("#svg1"), $("#path5"), $("#purple"), $("#teal")  );
    connectElements($("#svg1"), $("#path6"), $("#orange"), $("#green") );
}

var i = -15;
function quick_demo(){
  i += 0.2;
  var outerW  = parseInt($("#outer").css('width'));
  $("#outer").css({'width': outerW+i});
  resetSVGsize();
  connectAll();
 
  if (i<14.7) requestAnimationFrame(quick_demo);
  else        $("#outer").css({'width': ''});
}

$(document).ready(function() {
    // reset svg each time 
    resetSVGsize();
    connectAll();
    // resize simulation demo, comment it out to make it stop
    quick_demo();
 
});

$(window).resize(function () {
    // reset svg each time 
    resetSVGsize();
    connectAll();
});
              
            
!
999px

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