the selected attribute does not work unless it is used in conjunction with the 'query' attribute. In other words, this won't work:
Mr.Mrs.
-BUT...this WILL work-
ALSO - I've found that when making changes to your code, then hitting the 'refresh' button doesn't always actually 'refresh' the page. Be sure to hit the 'CTRL' + 'F5' key to do a 'hard refresh'.
bregan507