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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.
#Privacy cleaner chrome extension windows
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. Session storage is both per-origin and per-instance (per-window or per-tab) and is limited to the lifetime of the instance.
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As such, Web storage does not suffer from cookie Weak Integrity and Weak Confidentiality issues, described in RFC 6265 sections 8.5 and 8.6. The data is available to all scripts loaded from pages from the same origin that previously stored the data and persists after the browser is closed. Data placed in local storage is per origin-the combination of protocol, host name, and port number as defined in the same-origin policy. Web storage offers two different storage areas-local storage and session storage-which differ in scope and lifetime. Internet Explorer allows 10 MB per storage area.Google Chrome allows 10 MB per origin.Firefox 34 allows 10 MB (formerly 5 MB per origin in 2007 ).
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Web storage provides far greater storage capacity: However, either of these effects can be achieved with explicit client-side scripts, allowing for fine-tuning the server's desired interaction.Ĭookies are restricted to 4 kilobytes. 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 falls exclusively under the purview of client-side scripting. Web storage differs from cookies in some key ways.Ĭookies are intended for communication with servers they are automatically added to all requests and can be accessed by both the server and client-side.