How do I inspect an Electron app's DOM from a script?

I have an Electron app running on my computer (Slack). I would like to run some JavaScript that reads HTML DOM of this app. Is this possible? If so, is there a "getting started" somewhere?

In my mind, since Electron uses Node.js to host HTML / JavaScript, I can possibly read the DOM. At the same time, I could see this not being allowed because it could be a security risk. I'm ok with the security risk since it's running on my machine. So, I assume there would be a UAC prompt. Still, I'm just trying to figure out how to read the DOM from an external script if possible.

Thank you

from How do I inspect an Electron app's DOM from a script?