https://github.com/phonegap/phonegap-mobile-accessibility plugin
Closed Captioning 隐藏式字幕?(still can't find its uses) , to enable it: subtitles & Captioning>Closed Captions+SDH
Guide Access 引导式访问，single app mode, tripple click home btn to input passcode to exit this mode. can also disable other btn and even touch event.
InvertColors invert the screen color, mmm just like night-mode
MonoAudio - 单声道,其实也就是单耳耳机
usePreferredTextZoom - set textzoom to prefer value 1.06
announceString -
Speak - Speak string