Thanks. Handy to know but it looks like that moves it ahead or back by 1 second, according to the timeline, so that would be much more than a frame.Just an FYI,
With the video paused, you can use the "<" and ">" keys to advance or go back one frame at a time. I find this easier than trying to pause at just the right time. And, you can hold down the key to get a bit of a slow motion play of the video.
Nerds for Stats doesn't tell me the frame rate for that vid but YouTube recommends that uploaded vids use common frame rate values between 24-60 so you would be jumping that many frames with each key press.
If you double click it quickly you can see other frames in between. Might help to drink some coffee first LoL.