ChromeOS
To rotate screen
Ctrl + Shift + Refresh
Mirrored split-screen
Accessibility, Docked magnifier
Search + Ctrl + D
Whole screen magnifier
Search + Ctrl + M
Reverse scrolling to change the direction of the two finger scrolling (Default for ChromeOS is drag down moves screen down, drag up moves screen up)
Settings, Device, Touchpad, “Enable reverse scrolling”
This will make drag up moves the screen down, dragging down moves the screen down
Change default input language
Ctrl + Shift + Space
Switch between high contrast mode and normal
Search button + Ctrl + H
Display Zoom In/Out
In: Ctrl + Shift + =
Out: Ctrl + Shift + -
Reset to default: Ctrl + Shift + 0 (zero)
See all keyboard shortcuts
Ctrl + Alt + / (forward slash)