title: Using multiple font sizes in Plotly chart title (Python)
body: <p>I have a chart title which spans multiple lines using line breaks.</p>
  
  <p>I'd like to have everything after the first line in a smaller font (effectively a subtitle), but can't figure out a way to do this.</p>
  
  <p>Couldn't see any similar question on here.</p>
  
  <pre><code>import plotly.graph_objs as go
  data=[]
  layout = go.Layout(title='line1' + '&lt;br&gt;' +  'line2')
  fig = go.FigureWidget(data=data, layout=layout)
  fig
  </code></pre>
  
  <p>Any ideas appreciated!</p>