title: AttributeError: Unknown property axisbg
body: <p>Here is a code am trying to run:</p>
  
  <pre><code>ax = plt.axes(axisbg='#E6E6E6')
  ax.set_axisbelow(True)
  plt.grid(color='w',linestyle='solid')
  
  for spine in ax.spines.values():
     spine.set_visible(False)
  
  ax.xaxis.tick_bottom()
  ax.yaxis.tick_left()
  
  ax.tick_params(colors='gray',direction='out')
  for tick in ax.get_xticklabels():
     tick.set_color('gray')
  for tick in ax.get_yaxislabels():
     tick.set_color('gray')
  
  ax.hist(x,edgecolor='E6E6E6',color='E6E6E6');
  </code></pre>
  
  <p>And the Error is: AttributeError: Unknown property axisbg</p>
  
  <p>Please help me identify the error.</p>