HTML5 to Store Data in Local Storage and Write XML or JSON without IIS etc

Is this possible to do?  Data is captured in html5 forms, stored in local storage. While the limit is 5Mb per device/browser do key/value records mean you can store as many form records as will fit in 5Mb?

I would like to write XML although I want to eliminate 3rd party dependencies like google api's etc. If native JSON is the best answer, can the forms append the data after each new record is  added?

Are clientside javascript events and codes enough to perform the roles of a dedicated server like IIS.    I am not considering PHP at all. It must be a device and software independent solution.

Is there any support to compress and encrypt this data without a dedicated server? not essential for answer though..
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XGISAsked:
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Dave BaldwinFixer of ProblemsCommented:
Are clientside javascript events and codes enough to perform the roles of a dedicated server like IIS.
No.  Where do you plan on loading the page from in the first place?

Here is some info on 'local storage': http://www.w3schools.com/html/html5_webstorage.asp  Note that the restrictions are similar to cookies in that info stored by a web site can only be retrieved when you're on that same web site.

It must be a device and software independent solution.
That means that you must limit your application to the features that are common to all devices.
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