root
  └ (1) paragraph  

 selection: range  
  ├ anchor { key: 1, offset: 0, type: element }
  └ focus { key: 1, offset: 0, type: element }

 commands:
  └ { type: UNKNOWN, payload: FocusEvent }
  └ { type: UNKNOWN, payload: undefined }

 editor:
  └ namespace Playground
  └ editable true