Why the "scroll" event can't be triggered during the bubbling phase？

[Jim-Rae]

javascript-detect-element-resize/detect-element-resize.js

Line 125 in 1b79a1a

element.addEventListener('scroll', scrollListener, true);

I found that if I changed element.addEventListener('scroll', scrollListener, true); to element.addEventListener('scroll', scrollListener);, the "scroll" event would not be triggered.
So Why the "scroll" event can't be triggered during the bubbling phase？