This is a request for a "convenience" feature, and only a nice to have. It's based on seeing this feature in several little command line hypertext server apps.

If you run, for example:

datasette.exe serve --open "mydb.s3db" 

I would like it if default browser is launched, at the URL that is being served.

The angular cli does this, for example

ng serve --open #see https://angular.io/cli/serve

...as does my usual mini web server of choice when inspecting local static files....

npx http-server -o # see https://www.npmjs.com/package/http-server

Just a tiny thing. Love your work!