I couldn’t find any documentation on LESS style processing. Is this possible in a Notebook?
Sure, it’s certainly possible: here’s an example
We mostly just support built-in web standards instead of preprocessors like Less, but they still work fine. With CSS3+, lots of the cool features originally designed in Less are now possible with just built-in browser support. For example, Observable itself uses CSS variables to set syntax colors - feels like living in the future!
Thanks – I should have searched the Notebooks too (just searched help for this).