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"