title: Highcharts chart option backgroundColor:'transparent' showing black on IE 8
body: <p><code>Highcharts</code> chart option <code>backgroundColor:'transparent'</code> showing black on <code>IE 8</code></p>
  
  <pre><code>histogram = new Highcharts.Chart({
              chart: { renderTo: 'histogram', defaultSeriesType: 'bar',
                       backgroundColor:'transparent'
              }
  </code></pre>
  
  <p>This works fine on <code>I.E 9</code> and others but fails on I.E 8 and Safari anyone has any idea why ?</p>