Welcome to the Q&A Forum

Thank you as well, Eric!

Nobody outside of Google, knows this type of information with certainty.   My guess is that Google is only concerned with what is within the article portion of the page. My honest opinion is that Google is not concerned with keyword density unless it is outrageous.   If I am writing an article with the hope of ranking for a one-word query, my use of that word on the page has a density of about five percent.  I have that density because my writing is very precise and explicit. I never even think about how many instances of a keyword is on the page.  My only concern is if the article is easy to read, easy to understand, and contains value for the reader.  Over and over, Google has told webmasters to write as though search engines did not exist.  I believe that is what I should do.