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 : KHS Band
2nd Period: KMS Instrumental
3rd Period: KMS Instrumental
4th Period: KHS Piano
5th Period: KIS Beginning Band
6th Period: KIS Beginning Band
7th Period: KHS Piano
8th Period: KMS Concert Band
9th Period: KMS Piano