For Mac OS users, there is a system setting that may not allow you to tab onto several types of elements in a web page. To change this setting:
8:00-9:30 grades - 3rd and 4th 9:30-11:00 grades - Pre-K, ECSE, Lifeskills 11:45-1:15 grades - 1st 1:15-2:45 grades - Kindergarten and 2nd