I just can’t get it to work, it’s supposed to go in action when scrolling starts, but is just starts without.
I had been working but after an update it stopped working.
Any hints ?
When the element is visible, it starts immediately.
Even if I put a white box over the image it starts. 
Placing it at the bottom of the page does not help.
Well it’s not needed on the page, just a little gimmick.
Thanks for the answer.