smooth-scrollbar/geometry/is-visible.js

Customize scrollbar in modern browsers with smooth scrolling experience.

export function isVisible(scrollbar, elem) {
    var bounding = scrollbar.bounding;
    var targetBounding = elem.getBoundingClientRect();
    // check overlapping
    var top = Math.max(bounding.top, targetBounding.top);
    var left = Math.max(bounding.left, targetBounding.left);
    var right = Math.min(bounding.right, targetBounding.right);
    var bottom = Math.min(bounding.bottom, targetBounding.bottom);
    return top < bottom && left < right;
}
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