graph TB subgraph One a1-->a2-->a3 end

graph TB a_a --> b_b:::apa --> c_c:::apa classDef apa fill:#f9f,stroke:#333,stroke-width:4px; class a_a apa;

graph TB a_a(Aftonbladet) --> b_b[gorilla]:::apa --> c_c{chimp}:::apa -->a_a a_a --> c --> d_d --> c_c classDef apa fill:#f9f,stroke:#333,stroke-width:4px; class a_a apa; click a_a "http://www.aftonbladet.se" "apa"