HTML Web Storage

With web storage, web applications can store data locally within the user's browser.
Web storage is more secure, and large amounts of data can be stored locally, without affecting website performance.
Web storage is per origin i..e per domain and protocol. All pages, from one origin, can store and access the same data.

API and Web Storage

Google= 4.0
Microsoft Edge= 8.0
Firefox= 3.5

HTML Web Storage Objects

HTML web storage provides two objects for storing data on the client:
window.localStorage - stores data with no expiration date
window.sessionStorage - stores data for one session

if (typeof(Storage) !== "undefined") {
  // Code for localStorage/sessionStorage.
} else {
  // Sorry! No Web Storage support..
}

The localStorage Object

The localStorage object stores the data with no expiration date.
The data will not be deleted when the browser is closed, and will be available the next day, week, or year.

// Store
localStorage.setItem("lastname", "Smith");

// Retrieve
document.getElementById("result").innerHTML = localStorage.getItem("lastname");