Utility functions for inspecting various DOM characteristics

DOMUtils.js

// Find the height of the deepest DOM node
function getHeight(node) {
  var children = node.children;
  if (children.length === 0) {
    return 1;
  } else {
    var childHeights = Array.from(children).map(function (child) {
      return getHeight(child);
    });
    return 1 + Math.max.apply(null, childHeights);
  }
}

console.log(getHeight(document.documentElement));

// Count all DOM Nodes on page
function getNodesInPage() {
  return document.getElementsByTagName('*').length;
}

console.log(getNodesInPage());