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What's with variable names starting with "#" as first character?

If you are referring to class members in the JavaScript then those are private fields[1]

I had Googled my question too. Got no hits which is why I asked. Haven't seen it before.

That's just markdown headers. Some people like to include # as part of the header aesthetic

No, the Q was about javascript not markdown. Peer comment from afishh (9m after yours) has it right.