JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=7" />  
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
    <title>
    </title>
    <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/2.4/js/dojo/dijit/themes/Nihilo/Nihilo.css">
    <style type="text/css">
      html, body { 
        height: 100%; width: 100%;
        margin: 0; padding: 0;
      } 
      body{
        background-color:white; overflow:hidden; 
      } 
      #mapLeft {
        width: 50%;
      }
    </style>
    <script type="text/javascript">var djConfig = { parseOnLoad: true };</script>
    <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=2.4">
    </script>
    <script type="text/javascript">
      dojo.require("dijit.layout.BorderContainer");
      dojo.require("dijit.layout.ContentPane");
      dojo.require("esri.map");
      
      function init() {
        var initialExtent = new esri.geometry.Extent({"xmin":-13203273,"ymin":4024109,"xmax":-13158022,"ymax":4048033,"spatialReference":{"wkid":102100}});
        mapRight = new esri.Map("mapRight", {
          extent: initialExtent
        });
        
        mapLeft = new esri.Map("mapLeft", {
          extent: initialExtent
        });


        dojo.connect(mapRight, 'onLayersAddResult', function(e) {
          console.log('RIGHT: ', e);
        });

        dojo.connect(mapLeft, 'onLayerAddResult', function(e) {
          console.log('LEFT: ', e);
        });
        
        var url = "http://server.arcgisonline.com/ArcGIS/rest/services/World_Terrain_Base/MapServer";
        
        var tiledLayer1 = new esri.layers.ArcGISTiledMapServiceLayer(url);
        mapRight.addLayers([ tiledLayer1 ]);

        var tiledLayer2 = new esri.layers.ArcGISTiledMapServiceLayer(url);
        mapLeft.addLayers([tiledLayer2]);
      ...