Hi @jimm and welcome to the community
These examples are macros from the underlying MDN platform called “Yari” they get compiled while building the pages.
I think there are two ways to see them:
- You create a pull request when you think you’re finished. This will automatically create a preview link with the built examples included. If you want to improve the code afterwards, you can add more commits to the automatically created fork.
- You go the longer way to fork and clone the repo locally. There you can run the local preview server. How to do that is described in Forking and cloning the repository and the following chapter “Contributing to MDN”.
I hope that helps.
Michael