get all elements that have a scrollbar

which-scrolling-elements.js

// copied from this SO post here:
// https://stackoverflow.com/a/27822785/1337683

function isScroller(el) {
    var isScrollableWidth, isScollableHeight, elStyle;
    elStyle = window.getComputedStyle(el, null); // Note: IE9+
    if (elStyle.overflow === 'scroll' ||
        elStyle.overflowX === 'scroll' ||
        elStyle.overflowY === 'scroll') {
        return true;        
    }
    if (elStyle.overflow === 'auto' ||
        elStyle.overflowX === 'auto' ||
        elStyle.overflowY === 'auto') {
        if (el.scrollHeight > el.clientHeight) {
            return true;
        }
        if (el.scrollWidth > el.clientWidth) {
            return true;
        }
    }
    return false;
}

var els = document.querySelectorAll('body *');
for (var i = 0, el; el = els[i]; i++) {
    if (isScroller(el)) {
        console.log(el);
    }
}