Thanks, Artemis!
This is very handy and very comprehensive.
The comma usage I seem to see a lot these days which I believe is incorrect is adding a comma before an and when the second clause is dependent:
He ran to the front door, and threw it open with anticipation.
IncorrectHe ran to the front door and threw it open with anticipation.
CorrectI see this in published books, which is what lead me to construct the poll. I'd wondered if the rules had changed.
Thanks for taking the time to post all of this.
Lynn