Hello,

According to manual, ``clear_output`` event should clear whole cell output.

But with the following code

from ipywidgets import widgets
from IPython.display import clear_output
out = widgets.Output(layout={'border': '1px solid black'})
out.append_display_data(10)
display(out)
display("20")
out.clear_output()

only "10" is cleared, while "20" stays untouched.

I sniffed websocket, and I see absolutely regular "clear_output" is sent. 
Then, how does jupyter "understands" that only widget content must be 
cleared? This is not comm message, so no connection to widget is made.
How does it work?

Any help (doc or source link probably) is appreciated.

Thank you.
Ilya.

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