prevent Scroll bubbling from element to window

Solved (for some browsers) using a simple CSS property:
overscroll-behavior:

auto
The default scroll overflow behavior occurs as normal.

contain
Default scroll overflow behavior is observed inside the element this value is set on (e.g. “bounce” effects or refreshes), but no scroll chaining occurs to neighboring scrolling areas, e.g. underlying elements will not scroll.

none
No scroll chaining occurs to neighboring scrolling areas, and default scroll overflow behavior is prevented.

body{
  height: 600px;
  overflow: auto;
}

section{
  width: 50%;
  height: 50%;
  overflow: auto;
  background: lightblue;
  overscroll-behavior: none; /*   <--- the trick    */
}

section::before{
  content: '';
  height: 200%;
  display: block;
}

<section>
 <input value="end" />
</section>

Simply apply that style property on the element which the scroll should be “locked-in” to and the scroll event will not bubble up to any parent element which might have a scroll as well.

Same demo as above but without the trick:

body{
  height: 600px;
  overflow: auto;
}

section{
  width: 50%;
  height: 50%;
  overflow: auto;
  background: lightblue;
}

section::before{
  content: '';
  height: 200%;
  display: block;
}

<section>
 <input value="end" />
</section>