HTML5 - store data locally without php

I need a little help. I have a kiosk-like app, programmed in html that needs to store user statistics and contact(if provided) without php.

I've been reading the w3c documentation about the localStorage feature in HTML5. Does this feature store information in any local file? Is this a replacement to store data within a XML file?

What is the best way to store information locally?

thanks!