Long form is the best form.

Browsers are on a slow march towards fully adopting user options for standardized/algorithmic color stylesheets. Great debates over what color to paint the bike shed (website) will eventually end. Paint it (mostly) whatever color you want.

In addition to the invert filter, another way of quickly bootstrapping a dark mode CSS stylesheet is to use Chromium’s auto dark mode emulation as an initial reference.

If you don’t know which static site generator to use, choose one built in a language that you’re familiar with or want to learn. Under the hood they all use similiar constructs.

The sentiment that you cannot/don’t need to support all browsers is kinda accurate. In many scenarios you’ll never be able to support all browsers due to “business” constraints. Cross browser support is possible though.

But… let’s suppose that the only browser in “real” mainstream use is Chrome. It’s logical then to conclude that the only browser you need to develop for is Chrome, and that deduction works well for many companies.