how to set the bold font style in Plotly

If you are using Python you can add the <b> html tag to the title attribute and you are good.

You can add some more limited HTML styling such as italic as well, see example below.

enter image description here

import plotly
plotly.offline.init_notebook_mode()
data = [plotly.graph_objs.Bar(
            x=['giraffes', 'orangutans', 'monkeys'],
            y=[20, 14, 23]
    )]
layout = go.Layout(title='<b>Bold</b> <i>animals</i>')

fig = plotly.graph_objs.Figure(data=data, layout=layout)
plotly.offline.iplot(fig)

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