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:
Additional settings for Safari Browser.
RENWICK

Current Condition: few clouds
Temperature: 30.76ËšF
Feels Like: 18.16ËšF
Wind Speeds: 20.96mph
Weather humidity: 67%
Chance of Precipitation: %