Mac OS User Tabbing
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:
Open System Preferences and go to Keyboard:
Select the Shortcuts tab. Make sure the box for "Use keyboard navigation to move focus between controls" is checked.
Additional settings for Safari Browser.
Open Safari Preferences:
Select the Advanced tab. Make sure the box for "Press Tab to highlight each item on a webpage" is checked.
SkillsUSA is a national membership association serving high school, college and middle school students who are preparing for careers in trade, technical and skilled service occupations, including health occupations, and for further education. SkillsUSA is a partnership of students, teachers and industry working together to ensure America has a skilled workforce. SkillsUSA helps each student excel.