How to trigger a notebook save from within the notebook?

[DG]

Is there a command I can put it in a cell that would trigger a "Save" action (= same as hitting Save from the File menu)?

Where is this documented?

Thanks in advance,

    DG

[Matthias Bussonnier]

No, not reliably.

You can display(Javascript(...)) but that's assuming the notebook is
running in the current notebook interface.
It won't work with JupyterLab or whenrunning headless.
--
M

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[DG]

Matthias, thanks for your answer....but I don't understand it. 

The cell would be running in the notebook. 

DG