There are now quite a few notebook like features contributed by extensions, which usually leverage Web View API and Monaco Editor. We may want to look into what we can do from the core side to improve the user and/or development experience for notebooks.

--Update--

To track the analysis of different existing notebook implementation, we put the samples and benchmarks in a dedicated repository rebornix/notebook-test, which consists of following content

• Python notebook
  • Samples
  • Technical details
• Azure Data Studio notebook
  • Samples
  • Technical details
• Benchmark