Problems:

• Custom ipywidgets do not work in vscode.web (we don't download the JS files) #10060
• Custom widgets that have additional static resources do not get downloaded (applies to web, desktop & remove jupyter) #8834
• JS files for custom widgets are not loaded correctly (applies to web, desktop & remote) #10319, #8241
• If there's no network connection (to download widget js files from CDN) then custom ipywidgets do not work
  • Because of the previous 3 issues