Specification: http://dev.w3.org/html5/webstorage/
Multipage: http://www.whatwg.org/C#top
Complete: http://www.whatwg.org/c#top

Comment:
Hi!

Returning a null from getItem() if the key does not exist is downright
semantically wrong. null is a full-fledged value which can be serialized
(JSONed), and is NOT the value we get if we do:

var x = myObject.someUnknownProperty;

In that case we get the 'undefined' value, and that is what the return value
of getItem() _should_ be if the item is not found. undefined is not
serializable (JSONable) and is never a valid value, whereas null is sometimes
an application-/domain-valid value. Returning null from getItem() is ambiguous
in the case of an application using null as a placeholder or a "falsy" value.
Returning undefined is unambiguous.

----- stephan beal (sgbeal@googlemail.com)

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