Add text for HTML5 Web Storage
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@ -530,7 +530,25 @@ have not implemented Global Storage.
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Local Storage does, however, obey the same-origin policy by only allowing the
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originating domain access to its name-value pairs. Every website has their own
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separate storage area which maintains a clear separation of concerns.
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separate storage area which maintains a clear separation of concerns. Local
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Storage lends itself for different use cases. Especially applications that
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should function even when no internet connection exists can use Local Storage to
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enable that functionality. Coupled with file-based \glspl{API}, which are
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generally not limited in storage (except by the available disk space), offering
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the full range of features in offline-mode is feasible.
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The third category of HTML5 Web Storage is similar to Local Storage, but
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requires that the stored data be deleted after a session is closed. While
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content that is persisted by Local Storage, must be deleted explicitly by the
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user, Session Storage has the intended function of providing non-persistent
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storage.
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HTML5 Web Storage can be used for tracking in the same way that cookies are
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used: by storing unique identifiers which are read on subsequent visits.
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\citeauthor{ayensonFlashCookiesPrivacy2011}
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\cite{ayensonFlashCookiesPrivacy2011} found that 17 of the top 100 web sites
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used HTML5 Web Storage with some of them using it for cookie respawing (see
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section~\ref{subsec:evercookie}).
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\subsection{HTML5 Indexed Database API}
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\label{subsec:html5 indexed database api}
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