text: 
  Highcharts.setOptions({ // Apply to all charts
      chart: {
          events: {
              beforePrint: function () {
                  this.oldhasUserSize = this.hasUserSize;
                  this.resetParams = [this.chartWidth, this.chartHeight, false];
                  this.setSize(600, 400, false);
              },
              afterPrint: function () {
                  this.setSize.apply(this, this.resetParams);
                  this.hasUserSize = this.oldhasUserSize;
              }
          }
      }
  });
  
  Highcharts.chart('container', {
  
      title: {
          text: 'Rescale to print'
      },
  
      subtitle: {
          text: 'Click the context menu and choose "Print chart".<br>The chart size is set to 600x400 and restored after print.'
      },
  
      xAxis: {
          categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
              'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
      },
  
      series: [{
          data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
      }]
  
  });
  