title: Highcharts x-axis label
body: <p>In chart, the x-axis labels are overlapping, when chart data is big.
  I have used "step" property as follows :</p>
  
  <pre><code>xAxis: {                
              labels:{
                  step: (stepVal ? stepVal : 0),
                  },
      }
  </code></pre>
  
  <p>I calculate the value of stepVal, depending upon data.
  This resolves the issue of overlapping labels on x-axis.
  But, when I zoom the chart, I want to see all the labels on x-axis.
  How to get it?</p>