The following extensions need to be tested: <img width="312" alt="Screen Shot 2022-06-03 at 8 20 42 pm" src="https://user-images.githubusercontent.com/31978630/171840282-a20ffe41-6b7f-427e-8ea5-98292eda1418.png"> Find more information [here](https://myst-parser.readthedocs.io/en/latest/syntax/optional.html).
