HTML5 web storage: can different websites overwrite each other’s data on a user’s computer?

Posted by Deepak Mahalingam on Stack Overflow See other posts from Stack Overflow or by Deepak Mahalingam
Published on 2012-09-15T13:37:06Z Indexed on 2012/09/15 15:37 UTC
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html5

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local-storage

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web-storage

I have a few questions regarding the concept of HTML5 storage. I went through the w3c specification, books and tutorials on the same, but still I am a bit unclear about certain concepts:

Assume that I access Website A. Some JavaScript runs in my browser that sets a key value pair, say ('username','deepak'). Then I access Website B which also adds a key,value pair in the localstorage as ('username','mahalingam').

How will they both be differentiated?
Will Website B override the value set by website A in my localstorage?
How can we ensure that a website would not erase all of my localstorage?

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