Link

<!DOCTYPE html>
<meta charset="utf-8">

<style>

body {
    background: lightgray !important;
}

</style>

var margin = {top: 60, right: 60, bottom: 60, left: 60},
    width = 500 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var y = d3.scaleLinear()
    .range([0, height])

var x = d3.scaleLinear()
    .range([0, width]);

var colorScale = d3.scaleOrdinal()
    .domain(["gr","br","ta", "  "])
    .range(["#adfc16","#df4812","#fd9138","lightgray"])

var svg = d3.select("#chart").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var links = ["            grgrgrgrgrgr            \n          grgrgrgrgrgrgrgr          \n      ta  grbrbrbrbrbrbrgr  ta      \n      ta  brbrbrbrbrbrbrbr  ta      \n      tatabrtagrtatagrtabrtata      \n      tatabrtabrtatabrtabrtata      \n        tatatatatatatatatatabr      \n          grtatabrbrtatagrbrbr      \n      brbrbrbrbrtatatagrgrgrta      \n    brbrtabrbrbrbrgrgrgrgrgrta      \n    brtatatabrbrtabrbrgrgrbr        \n    brbrtabrbrbrtagrbrbrbrgr        \n    brbrtabrbrbrtabrbrgrgrgr        \n    brbrbrbrbrbrtagrgrgrbr          \n      tatatatata    brbrbr          \n                    brbrbr          \n","            grgrgrgrgrgr            \n          grgrgrgrgrgrgrgr          \n      ta  grbrbrbrbrbrbrgr  ta      \n      ta  brbrbrbrbrbrbrbr  ta      \n      tatabrtagrtatagrtabrtata      \n      tatabrtabrtatabrtabrtata      \n        tatatatatatatatatatabr      \n        grgrtatabrbrtatagrgrbr      \n    brbrbrbrbrtatatatagrgrbrbrbr    \n  brbrtabrbrbrbrgrgrgrgrgrtabrbr    \n  brtatatabrbrtabrbrgrgrtatatabr    \n  brbrtabrbrbrtagrbrbrbrbrtatata    \n  brbrtabrbrbrtabrbrgrgrgrgrta      \n  brbrbrbrbrbrtagrgrgrgrgrgr        \n    tatatatatabr    brbrbrbr        \n          brbrbr                    \n"]

var loopIndex = 0;

x.domain([0, linkData[0].points.length])
y.domain([0, linkData[0].points.length])

svg.selectAll(".block-group")
    .data(linkData.filter(function(d) { return d.num == 0 }))
  .enter().append("g")
    .attr("class", "block-group")
    .attr("transform", function(d,i) {return "translate(0," + y(i) + ")" } )
 .selectAll(".block")
    .data(function(d) { return d.points })
  .enter().append("rect")
    .attr("class", "block")
    .attr("x", function(d, i) { return x(i) })
    .attr("width", width/x.domain()[1])
    .attr("height", height/y.domain()[1])
    .style("fill", function(d) { return colorScale(d) });

var indexNum = 0;
d3.interval(function(elapsed) {
svg.selectAll(".block-group")
    .data(linkData.filter(function(d) { return d.num == indexNum }))
 .selectAll(".block")
    .data(function(d) { return d.points })
    .attr("x", function(d, i) { return x(i) })
    .style("fill", function(d) { return colorScale(d) });

if(indexNum == links.length-1) {
        indexNum = 0;
    } else {
        indexNum += 1;
    }
}, 300);

</script>

https://d3js.org/d3.v4.min.js