Calculating usage of localStorage space

Question

I am creating an app using the Bespin editor and HTML5\'s localStorage. It stores all files locally and helps with grammar, uses JSLint and some other parsers for CSS and HT

Answer 1

IE8 implements the remainingSpace property for this purpose:

alert(window.localStorage.remainingSpace);  // should return 5000000 when empty

Unfortunately it seems that this is not available in the other browsers. However I am not sure if they implement something similar.