Greek symbols in UI titles

[R_S]

Hi,

I am trying to create a slider that has \mu_1 as a title. I tried using title=r'\mu_1', which just gave me the literal string not the actual greek symbol. I also tried using MathML, which appears to be working in graphs but throws an error when I try to use it in the title of a slider.

from bokeh.models import Slider, MathML

mu_1 = """
<math>
  <mrow>
    <msub>
      <mi>&mu</mi>
      <mn>1</mn>
    </msub>
  </mrow>
</math>
"""

my_slider = Slider(title=MathML(text=mu_1),
                   value=0.5,
                   start=-1.0,
                   end=1.0,
                   step=0.1)

This gives me the following error message

ValueError: failed to validate Slider(id='1113', ...).title: expected either None or a value of type String, got MathML(id='1112', ...)

Is there an easier way to do this? Do sliders and other UI elements support MathML?

[Bryan]

2.4 added math text support only to axes and Div. Support for other places e.g titles, labels, sliders, and legends is coming in Bokeh 3.0 in the next few months.