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Why do I get "var already defined" errors in the JS console on Chrome, even in the code works properly on loading?

So this is a question for thoroughness sake.

Is it because the page loading causes the identified to be defined, and the console can't "re" define it?

If I open a fresh page that hasn't run the code and then paste it in the console, it works properly. If I try to run it a second time, though I get the same errors.

I just want to know I'm on the right track for understanding the behavior.