The [Ipywidgets FAQ](https://ipywidgets.readthedocs.io/en/stable/user_install.html#frequently-asked-questions) says "When display a widget or interact, I just see some text ..." I'm getting this too; how could I debug it ? 1) which tests in `widgets/tests/test_interaction.py` could I run ? 2) set breakpoints in `widgets/interaction.py` ? 3) test node.js standalone ? (I've also asked on SO: [how-to-install-ipywidgets-and-run-interact-in-ipython](https://stackoverflow.com/questions/62306962/how-to-install-ipywidgets-and-run-interact-in-ipython) ) My versions: macos 10.10.5 python 3.7.6 ipython-7.19.0 ipywidgets-7.5.1 jupyter_core-4.7.0 matplotlib-3.3.3 node v12.18.0 no virtualenv Thanks, cheers