Tried to inform the Codepen team about this but apparently they can’t see the issue… is it just me or does the animation have a hickup when you press the right button for the first time?
Example
I’ve seen it with other pens as well and on all major Windows browsers. Looks to me like to content window doesn’t have focus from the start, making it to ‘wake up’ first and skip a beat. It does not happen when anything else inside the window is clicked first – or when uncommenting the line that brings focus to it.
Thanks in advance.