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:
1st Period – DC Stats/College Algebra
2nd Period –Conference
3rd Period - Algebra I
4th Period - Honors Algebra II
5th Period - Honors Algebra II
2nd Lunch
6th Period - Algebra I
7th Period - DC Stats/College Algebra
8th Period – AP Calculus