ChromeVox - OK
Select-to-speak - NA because it's activated through shelf, which is hidden during locked mode
Dictation - NA because it's activated through shelf, which is hidden during locked mode
High contrast mode - OK
Fullscreen magnifier- OK
Docked magnifier - OK, but hides the top area of the quiz. The close quiz button is not reachable in this mode. Only way to close the quiz is by submitting it. This is a bug in the docked magnifier feature that happens when going full screen in any window 
Automatic clicks - OK
On-screen keyboard - OK

We need to assess if it's ok to launch locked mode with these limitations.