[BUG] Template does not seem to render correctly in Firefox

[hoxbro]

Software versions

https://docs.bokeh.org/en/3.3.1/docs/examples/plotting/periodic_shells.html

Browser name and version

Mozilla Firefox 119.0

Jupyter notebook / Jupyter Lab version

No response

Expected behavior

Template to look the same as in Chrome.

Observed behavior

When seeing Template used in this example it does not render as expected in Firefox

Example code

https://docs.bokeh.org/en/3.3.1/docs/examples/plotting/periodic_shells.html

Stack traceback or browser console output

No response

Screenshots

In Firefox:

In Google Chrome:

[mattpap]

Similar issue to what I already fixed in UIElementView.render(). I will need to reuse that implementation to make Firefox happy.