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

[1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

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I had Googled my question too. Got no hits which is why I asked. Haven't seen it before.
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That's just markdown headers. Some people like to include # as part of the header aesthetic
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No, the Q was about javascript not markdown. Peer comment from afishh (9m after yours) has it right.
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