Scope of sessionStorage and localStorage

I read some documentation on sessionStorage and localStorage, but I don't understand what the scope is: the domain, a specific page?

For example, if I have the following pages:

And if on each of the above pages I run (with idvalue being the value in the querystring):


Am I going to end up with 3 different values stored, or are the values going to overwrite each other?



The values are going to overwrite each other. Each key-name pair is unique for a protocol and domain, regardless of the paths.

The affected domain can be changed via the document.domain property.

  • -> is possible (subdomain)
  • -> is not possible

Session Storage:

  1. Values persist only as long as the window or tab in which they stored.

  2. Values are only visible within the window or tab that created them.

Local Storage:

  1. Values persist window and browser lifetimes.

  2. Values are shared across every window or tab running at the same origin.

So, by reading and understanding this each key-value pair is unique for each domain, because local storage persist values across window or tab.


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