How to download source code?

How to download the source code of this topic?
I try “Download code” and “Embed code”… but this’s not what I want… I want to download the source code and test it

Right - downloading and embedding are for deployment. Of course, the notebook is live so you can try it out and/or make small changes right away. You can also save as many changes as you’d like by forking the notebook.

How can I use it without ObservableHQ?

As for as I’m aware, the notebook is proprietary and runs only on

Here’s an example which describes how to download and run the notebook with zero external dependencies: