ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

python: 3.7.7
bokeh: 2.2.1
jupyter_core: 4.5.0
jupyter_client: 5.3.3
Chrome 85
macOS Catalina 10.15.7

Description of expected behavior and the observed behavior

In CSS, identifiers cannot start with a digit, two hyphens, or a hyphen followed by a digit (see [reference](https://www.

https://readthedocs.org/projects/chartify/builds/

Today I was checking out the library and MSVC warns for https://github.com/alandefreitas/matplotplusplus/blob/359a775710e1b1fd5667281a0855806f149b7ab0/source/matplot/util/contourc.cpp#L1771

BOUNDARY_S returns a bool do the expression is bool > 0

I believe the API is stable enough to begin documenting in roxygen and also in other supplementary materials, such as vignettes and articles.

For instance should it be called Mortality Rate, or Known Mortality Rate? Each of the labels should have a tooltip perhaps explaining in a bit more detail, but every page should list not only sources, but how we arrived at the data (or link to a "Methodology" page)