focus-on-next: (selector set) [every (time)] [after (time)][, (element)...];
selector set = Any valid CSS selector referencing multiple elements.
When this command is run, the selector set will be scanned, and if the currently focused element is found in there, it will change the focus to the next element in the selector set.
When it gets to the end of the set, running this action command will take no further effect.
Note: This won't work well with click events triggering this action. The reason being that when you click, you lose the current focus. It is no longer part of the selector set - the focus gets put onto the object you clicked on. So it is best used with keyboard events. We may expand this to remember the last input field focused so the command ignores the click focus, but for now just use it with keyboard events.
Also note that it will only work on elements that can receive focus.