Get depth of a DOM tree with a list of nodes included into longest path

dom-tree-depth-level.js

function getDomDepthLevel(root = document.documentElement) {
    let pathInfo = {
        route: [],
        level: 0
    };
    for (let i = 0, j = root.children.length; i < j; i++) {
        const curNodePathInfo = getDomDepthLevel(root.children[i]);
        if (curNodePathInfo.level > pathInfo.level) {
            pathInfo = curNodePathInfo;
        }
    }
    pathInfo.route.unshift(root);
    pathInfo.level += 1;
    return pathInfo;
}