2Graph1Dom

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <div>
    <div id="chart1" style="background-color: red; width: 440px; height: 200px; display: inline-block;"></div>
    <div id="chart2" style="background-color: black; width: 440px; height: 200px; display: inline-block;"></div>
  </div>
  <script>
var width=400; 
var height=200;
var margin = {top: 20, right: 20, bottom: 30, left: 40};
    
function create_scatterplot(el,data_path,var_x,var_y,size){
  console.log("test")

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

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

var r = d3.scaleSqrt()
		.range([2,10]);
  
var xAxis = d3.axisBottom()
		.scale(x);

var yAxis = d3.axisLeft()
		.scale(y);
  
var color = d3.scaleOrdinal(d3.schemeCategory20);
var symbols = d3.scaleOrdinal(d3.symbols);

// creates a generator for symbols
var symbol = d3.symbol().size(100);  
  
var svg = el.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 tooltip = d3.select("body").append("div")
					.attr("class", "tooltip")
					.style("opacity", 0);

d3.csv('iris.csv', function(error, data){
	data.forEach(function(d){
    d.sepal_length = +d.sepal_length;
    d.sepal_width  = +d.sepal_width;
    d.petal_length = +d.petal_length;
    d.petal_width  = +d.petal_width;
	});

x.domain(d3.extent(data, function(d){
		return d.sepal_length;
	})).nice();

y.domain(d3.extent(data, function(d){
		return d.sepal_width;
	})).nice();

r.domain(d3.extent(data, function(d){
		return d.petal_length;
	})).nice();
  
  svg.append('g')
    .attr('transform', 'translate(0,' + height + ')')
    .attr('class', 'x axis')
    .call(xAxis);

svg.append('g')
    .attr('transform', 'translate(0,0)')
    .attr('class', 'y axis')
    .call(yAxis);

svg.append('text')
		.attr('x', 10)
		.attr('y', 10)
		.attr('class', 'label')
		.text('Sepal Width');

svg.append('text')
		.attr('x', width)
		.attr('y', height - 10)
		.attr('text-anchor', 'end')
		.attr('class', 'label')
		.text('Sepal Length');
  	
  // we use the ordinal scale symbols to generate symbols
  // such as d3.symbolCross, etc..
  // -> symbol.type(d3.symbolCross)()
    svg.selectAll(".symbol")
    .data(data)
  .enter().append("path")
    .attr("class", "symbol")
    .attr("d", function(d, i) { return symbol.type(symbols(d.species))(); })
    .style("fill", function(d) { return color(d.species); })
    .attr("transform", function(d) { 
      return "translate(" + x(d.sepal_length) + "," + y(d.sepal_width) +")"; 
    })
});} 
    create_scatterplot(d3.select("#chart1"));
    create_scatterplot(d3.select("#chart2"));

</script>
</body>

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