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 (data is lost when the browser tab is closed)

Before using web storage, check browser support for localStorage and sessionStorage:

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