code: function setSizes(){
    
      // Put the scatter plot on the left.
      scatterPlot.box = {
        x: 0,
        y: 0,
        width: div.clientWidth / 2,
        height: div.clientHeight
      };
  
      // Put the bar chart on the right.
      barChart.box = {
        x: div.clientWidth / 2,
        y: 0,
        width: div.clientWidth / 2,
        height: div.clientHeight
      };
    }
docs: Sets the `box` property on each visualization to arrange them within the container div.