Good afternoon, colleagues!
Please tell me, in the solution below, for some reason, sometimes there is a "twitching" of the line that moves.
Moreover, in my project - it sometimes "jerks" (as if it starts anew every time, and does not continue) - uploaded to codepen.io - everything works stably, nothing jumps.
With what it can be connected?
How to make the RIGHT implementation?
Sincerely.