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:
8:20 – 9:15 US History
9:20 – 10:10 US History
10:15 – 11:05 US History
11:10 – 12:00 Plan
12:00 – 12:25 Lunch
12:30 – 1:20 US History
1:25 – 2:15 US History
2:20 – 3:10 Current Events