[ Para
    [ Str "First"
    , Space
    , Span ( "" , [ "a" ] , [] ) [ Str "one" ]
    , Space
    , Str "and"
    , Space
    , Str "second"
    , Space
    , Span ( "" , [ "b" ] , [] ) [ Str "two" ]
    , Space
    , Str "in"
    , Space
    , Str "a"
    , Space
    , Str "row."
    ]
]
