Youtube and numbers on the keyboard

Probably the full topic does not pull, but I think this information can be useful to many. And the information is that when watching a video on youtube.com, using the numbers on the main part of the keyboard (not the ones on the right, but the ones on the top), you can scroll the video forward or backward to the position conditionally corresponding to that part the digit you press. Those. when you press the number 5, the video will be rewound to the middle, 0 to the beginning, etc. Recently, I stumbled upon it myself, it is really convenient for me, especially to scroll the beginning (introduction, etc.), to see what will be at the end. And the arrows to the right and left, scroll through the positions by plus and minus one. I apologize if the information was already there, I did not find anything.