I have a page full of content and window is scrollable, in which there is scrollable div where my objective is to place an icon at the very bottom
A standardly supported way is to edit the HTML markup and add a wrapper element to both the scrollable and the "fixed" element - which will now have position: absolute; instead:
#wrapper { /* ADDED */
position: relative;
width: 200px;
}
#scrollable {
height: 100px;
border: 1px solid;
overflow: auto;
position: relative;
}
#wrapperFooter {
background: red;
position: absolute; /**/
bottom:0;
}