How to use standalone-chrome for localhost

I have this site which runs locally which I want to test.

http://localhost

I guess this question also applies to selenium/node-chrome and the firefox versions.

First of all, how does this container work, does it run a headless chrome browser?
Than, second, is it possible to use this container to test a site on localhost ? I’ve managed to test a public available site, but not a local one.