VoiceOver is a screen reader program that comes on new Mac computers, iPhones, iPads, and iPod touches.
Toggle VoiceOver: Command + F5
VO: Control + Option
VO + command + H: Next heading
VO + A: Start Reading
Control (while in Reading): Pause/Resume Reading
Tab: Next link or form control
VO + →: Read next item
VO + ←: Read previous item