new_contents: import bokeh.plotting as plt
  from itertools import product
  
  plt.output_file('properties_alpha.html')
  
  cats = ['RGB', 'RGBA', 'Alpha+RGB', 'Alpha+RGBA']
  p = plt.figure(x_range=cats, y_range=cats,
                 title="Fill and Line Color Property Combinations")
  
  alpha = 0.5
  fill_color = (242, 44, 64)
  fill_color_alpha = (242, 44, 64, alpha)
  line_color = (64, 126, 231)
  line_color_alpha = (64, 126, 231, alpha)
  
  # define fill and line color combinations
  fill = [(1, {'fill_color': fill_color}),
          (2, {'fill_color': fill_color_alpha}),
          (3, {'fill_alpha': alpha, 'fill_color': fill_color}),
          (4, {'fill_alpha': alpha, 'fill_color': fill_color_alpha})]
  
  line = [(1, {'line_color': line_color}),
          (2, {'line_color': line_color_alpha}),
          (3, {'line_alpha': alpha, 'line_color': line_color}),
          (4, {'line_alpha': alpha, 'line_color': line_color_alpha})]
  
  # plot intersection of fill and line combinations
  combinations = product(fill, line)
  for comb in combinations:
      x, fill_options = comb[0]
      y, line_options = comb[1]
  
      options = fill_options.copy()
      options.update(line_options)
  
      p.circle(x, y, line_width=7, size=50, **options)
  
  p.xaxis[0].axis_label = "Fill Options"
  p.yaxis[0].axis_label = "Line Options"
  plt.show(p)
  
subject: Add plot for color property combinations to examples.