The text of this cell, represented as text document.
The most recent execution summary for this cell.
The index of this cell in its containing notebook. The
index is updated when a cell is moved within its notebook. The index is
when the cell has been removed from its notebook.
The kind of this cell.
The metadata of this cell. Can be anything but must be JSON-stringifyable.
The notebook that contains this cell.
The outputs of this cell.