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:
*Renovation, Repair, Painting Rule (Lead)
*Tools for Schools
*Backflow Prevention
*Hazard Communications and Chemical Disposal
*Storage Tanks
*Water/Waste Water
*Fire Alarms, Sprinklers & Extinguishers
*Boiler Inspections
*Elevator/Escalators
*HVAC Licensing
*TABA (Texas Architectural Barriers Act)