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:
Concerns the quality of the physical and aesthetic surroundings; the psycho-social climate, safety, and culture of the school; the school safety and emergency plans; and the periodic review and testing of the factors and conditions that influence the environment. Factors and conditions that influence the quality of the physical environment include the school building and the area surrounding it; transportation services; any biological or chemical agents inside and outside the school facilities that are detrimental to health; and physical conditions such as temperature, noise, lighting, air quality and potential health and safety hazards. The quality of the psychological environment includes the physical, emotional and social conditions that affect the safety and well being of students and staff. Qualified staff such as facilities and transportation supervisors, principals, school and community counselors, social workers, psychologists, school health nurses, health educators, and school safety officers assesses and plan for these factors and conditions in the school environment.