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 Blk: 8:05-9:25
2nd Blk: 9:30-10:50—MY CONFERECE!
3rd Blk: 10:55-11:35
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5th Blk: 1:40- 3:05