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<HTML5 in the browser: Local data storage ⁄ >




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HTML5 Web Storage, Web Database, FileReader, FileWriter, and AppCaching APIs will transform Web pages into local applications, but not yet.

Of all the changes bundled in the HTML5 drafts, few are as radical or subversive as the options for storing data locally. From the very beginning, the Web browser was intended to be a client in the purest sense of the word. It would display information it downloaded from a distant server, and it would do everything the distant server would tell it to do.

Programmers discovered the limitations to this fairly soon, and before long browsers started offering website developers the chance to leave a little piece of data behind. The creators tried giving this 4,096-byte text string a cute name, "cookie," but that didn't stop the controversy. Cookies became the focus as the greater public started to wonder just how the inscrutable gnomes at the central office were tracking their every move. People demanded and got the ability to delete cookies, which limited their possibilities for the developers.



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