www.wysiwygwebbuilder.com

I am trying to show an image when the page is scrolled.
What is the difference between onscrollreveal Vs onscroll event?
I mean when I am selecting "onscrollreveal" what should I choose in Action?
Moreover, the "onscroll" with Action "show" and image selected (image hidden) is not working.

onscroll is a standard HTML event.
The onscroll event occurs when an element's scrollbar is being scrolled.

the onscrollreveal event is specific for WWB.
onscrollreveal event fires when the object is completely visible in the view port of the browser.

See this tutorial:
https://www.wysiwygwebbuilder.com/bookmark_events.html