map $ span $ toHtml "foo"Result:
<map><span>foo</span></map>
map f (x1 :> x2 :> ... :> xn :> Nil) == (f x1 :> f x2 :> ... :> f xn :> Nil)and corresponds to the following circuit layout:
map (++ "x") (fromList [(5,"a"), (3,"b")]) == fromList [(3, "bx"), (5, "ax")]