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local Storage for Web Applications

is a way for web pages to store named key/value pairs locally, within the client web browser

localstore

HTML5 Storage is based on named key/value pairs.
You store data based on a named key, then you can retrieve that data with the same key.
The named key is a string.
The data can be any type supported by JavaScript, including strings, Booleans, integers, or floats.
However, the data is actually stored as a string
If you are storing and retrieving anything other than strings, you will need to use functions like parseInt() or parseFloat() to coerce your retrieved data into the expected JavaScript datatype.
Calling setItem() with a named key that already exists will silently overwrite the previous value. Calling getItem() with a non-existent key will return null rather than throw an exception.
Local storge has four basic methods

A StorageEvent is sent to a window when a storage area it has access to is changed within the context of another document.