Why do tabs submit?

Why does clicking on a tab submit the page? When I hover the mouse over a tab, I see javascriopt:doSubmit('TAB_NAME').
Why is this? What if I want to discard all changes made on my current page and move to the tab target? As a UI concept, arent tabs supposed to work that way i.e. like a URL GET or redirect?
Thanks

I think it's because it's generally more polite behavior to allow users to partially complete a form, tab to another page, then tab back to the form and have the form values preserved. Submitting the page accomplishes this. Note that after-submit events up to and including computations fire but nothing after that, i.e., validations, processes, and subsequent branches. You can shorten the path further by using before-computation branching.
This looks to me like one of those design/implementation tradeoffs that solves more problems than it creates, so in short, that's just the way it works.
Scott

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