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:
What Can I Control? A Visual Activity for Students Who Want to Control Everything
https://://www.haworth.k12.ok.us/17845_3 Demonstrate Importance of Washing Hands
https://m.youtube.com/watch?v=U7ryO6E7ZUw Three in a Row Activities!