10 Facts About Web storage

Web storage, sometimes known as DOM storage, provides web apps with methods and protocols for storing client-side data.

Web storage falls exclusively under the purview of client-side scripting.

Web storage data is not automatically transmitted to the server in every HTTP request, and a web server can't directly write to Web storage.

Web storage offers two different storage areas—local storage and session storage—which differ in scope and lifetime.

Data placed in local storage is per origin—the combination of protocol, host name, and port number as defined in the same-origin policy.

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Session Web storage is both per-origin and per-instance and is limited to the lifetime of the instance.

Session storage is intended to allow separate instances of the same web app to run in different windows without interfering with each other, a use case that's not well supported by cookies.

Web storage provides a better programmatic interface than cookies because it exposes an associative array data model where the keys and values are both strings.

Browsers that support web storage have the global objects sessionStorage and localStorage declared at the window level.

Similar controls over web storage are available through 3rd party browser extensions.