You posted a "screen-stretching URL.....
And it seemed to have affected the page even when absent. When I could still edit the post, I went back and deleted the URL in its entirety. However, the page still stretched.
Too bad the edit is closed to me....it would be interesting to see what happens if the "code" tags were put in now.
Anyway, it appears the answer to my original question, "Does the URL text tell us anything" is no.