Tabs as fragments
Press the arrow keys: each tab is a fragment, so they arrive in turn.
The first tab.
The second, reached with the next arrow press.
And the third.
tab-active selects which tab is open when the slide arrives, counting from zero.
tab-active
Not this one.
Nor this one.
This one, because tab-active="2" counts from zero.
tab-active="2"
First tabset, tab A.
First tabset, tab B.
Second tabset, tab X.
Second tabset, tab Y.
Each is navigated in turn.