Test for the tree-listbox custom element

- Item with no children
- Item with children
  - First child
  - Second child
- Item with grandchildren
  - First child
    - First grandchild
    - Second grandchild

- Before
- - Item with collapsed children
    - Hidden child
  - Item with children
    - First child
    - Second child
  - Item with grandchildren
    - First child
      - First grandchild
        - Hidden child
      - Second grandchild
      - Third grandchild
        - Hidden child
  - Fourth item
    - First child
      - Hidden child 1
      - Hidden child 2
    - Second child
    - Third child
      - First Grand child
      - Second Grand child
    - Fourth child
      - Hidden child 1
      - Hidden child 2
  - Second last item
    - Last child
  - Last item
- After

- Item with no children
- Item with children
  - First child
  - Second child
- Item with grandchildren
  - First child
    - First grandchild
    - Second grandchild