onscroll (HTML attribute)
onscrollattribute is used to identify when an object is moved as a result of a scroll operation (for example, a document that does not fit in the viewport is scrolled to reveal content further down).
No fixed value - could be a call
to one or more defined functions or a simple
Non-standard event defined by Microsoft for use in Internet Explorer. May work in some other browsers but cannot be reliably used. Compatibility for this non-standard attribute not tested.