holoviz

During a recent Dask tutorial someone asked "Can Datashader run on Dask?" and I was pleased.

It would be good to have an easy-to-run example that was advertised Datashader from Dask resources. Often we do this in examples.dask.org . Is there an example that makes sense to deploy there?

The current version of Panel is 0.12.1.

If I look at the Bokeh DateSlider I can see it supports a step and format which the Panel DateSlider does not.

I think supporting that would be quite useful for Panel as that would allow sliding through other timeperiods than day

Generally categorical colormaps should be registered as ListedColormap instead of a LinearSegmentedColormap so the Glasbey colormaps should be switched.

As far as I can tell, the Pandas .plot() API does not have a way to change the background color without dropping down to matplotlib. hvPlot appears to inherit this the same limitation. We can of course do .opts(bgcolor='black'), but I've found that in many examples that's the only use of .opts I have to resort to

ALL software version info

geoviews=1.8.1
holoviews=1.13.2
bokeh=2.0.1

Description of expected behavior and the observed behavior

gv.WMTS() docs specify "The WMTS Element represents a Web Map Tile Service specified as a
URL containing {x}, {y}, and {z} templating variable". Many servers provide urls with lowercase template variables, but it seems geoviews throws and error un