Icons are not shown in embedded mode

[pyfrid]

Description.

The font awesome icons are not displayed in embedded mode when jupyter notebook is exported to html using nbconvert (or jupyter lab/notebook "Save and Load" menu).

When jupyter lab/notebook is running, the icons are displayed.

When the html file is opened in a Chrome or Firefox browser, the console shows the following errors:

eeccf4f66002c6f2ba24.woff:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
be9ee23c0c6390141475.ttf:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
1551f4f60c37af51121f.woff2:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
eeccf4f66002c6f2ba24.woff:1 Failed to load resource: net::ERR_FILE_NOT_FOUND

For some reason, these files are being searched for on disk, but not loaded.

Context

• jupyter lab version 3.5.2
• ipywidgets, tried versions 7.6.5, 7.7.2, 8.0.4
• Operating System Linux Mint 20

notebook.html.zip