Question

After going through specification on HTML5 Storage: http://www.whatwg.org/specs/web-apps/current-work/multipage/webstorage.html#event-storage

In the paragraph 11.3 Disk space I have read that

User agents should allow users to see how much space each domain is
using.

But there is no information on how I can do this.

The only solution I came up with – is a hack like this:

JSON.stringify(localStorage).length

Is there a normal way to do it, because in my case you can see just one domain, not each domain.

Answer 1

An no one gave any response, I will be additing my own answer with whatever information I will find.

JSON.stringify(localStorage).length approximate number works for every browser

IE:
can be used through JS: window.localStorage.remainingSpace

Chrome:
through Settings>Content Settings>Cookies & Site data