ipywidgets not working under VSCode

Here’s the minimal example not displaying anything

import numpy as np
import panel as pn
import ipywidgets as ipw

pn.extension('ipywidgets')

date   = ipw.DatePicker(description='Date')
slider = ipw.FloatSlider(description='Float')
play   = ipw.Play()

layout = ipw.HBox(children=[date, slider, play])

pn.panel(layout)

Setup:
ipywidgets==7.8.5
ipywidgets-bokeh==1.6.0
panel==1.6.1