(Timeline window)
Result
Windows
Macintosh
Deselect selected keyframes and animator groups and leave their layers selected
Ctrl + Alt + Shift + A
Command + Option + Shift + A
Go to the next in or out point
Ctrl + Shift + Alt + Right Arrow
Command + Shift + Option + Right Arrow
Go to the previous in or out point
Ctrl + Shift + Alt + Left Arrow
Command + Shift + Option + Left Arrow