Add text for HTML5 Web Storage

chapters/methods.tex

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