__This__

{{{
%%tabbedSection
%%tab-First
This is the first tab
%%
%%tab-SecondTab
This is the second tab
%%
%%tab-ThirdTab
This is the third tab
%%
%%
}}}

__produces this__

%%tabbedSection
%%tab-First
This is the first tab
%%
%%tab-SecondTab
This is the second tab
%%
%%tab-ThirdTab
This is the third tab
%%
%%

! Notes
* I've only stumbled on tabbedSection; is it actually described somewhere in this wiki?  Have I just missed all this time?
* the tab-[[tabname] should be unique in the page or you get odd tab operation issues.
* CamelCase tabnames properly space themselves

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