JSFiddle - React, Tailwind, and code Playground

JavaScript

var svg = d3.select("body").append("svg")
    .attr("width", 960)
    .attr("height", 500);

// Add a group to the canvas
var group = svg.append("svg:g")
    .attr("transform", "translate(10, 10)")
    .attr("id", "group");

var rect1 = group.append("svg:rect")
    .attr("rx", 6)
    .attr("ry", 6)
    .attr("x", 5/2)
    .attr("y", 5/2)
    .attr("id", "rect")
    .attr("width", 250)
    .attr("height", 125)
    .style("fill", 'white')
    .style("stroke", d3.scale.category20c())
    .style('stroke-width', 5);


var html1 = group.append("foreignObject")
    .attr("x", 50)
    .attr("y", 25)
    .attr("width", 200)
    .attr("height", 100)
    .attr("id", "fobject")
    .style("border-color", d3.scale.category20c())
    .append("xhtml:div")
    .style("font", "14px 'Helvetica Neue'")
    .html("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec eu enim quam.");

var innerSvg = svg.append("svg")
      .attr("x", 500)
      .attr("y", 10)
      .attr("id", "innerSvg");

    var rect2 = innerSvg.append("svg:rect")
    .attr("rx", 6)
    .attr("ry", 6)
    .attr("x", 5/2)
    .attr("y", 5/2)
    .attr("id", "rect")
    .attr("width", 250)
    .attr("height", 125)
    .style("fill", 'white')
    .style("stroke", d3.scale.category20c())
    .style('stroke-width', 5);

var html2 = innerSvg.append("foreignObject")
    .attr("x", 50)
    .attr("y", 25)
    .attr("width", 200)
    .attr("height", 100)
    .attr("id", "fobject")
    .style("border-color", d3.scale.category20c())
    .append("xhtml:div")
    .style("font", "14px 'Helvetica Neue'")
    .html("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec eu enim quam.");

var drag1 = d3.behavior.drag()
        .origin(function() { 
            var t = d3.select(this);
            return {x: t.attr("x") + d3.transform(t.attr("transform")).translate[0],
                    y: t.attr("y") + d3.transform(t.attr("transform")).translate[1]};
        })
        .on("drag", function(d,i) {
           ...