debug.js

function isNgElement(el) {
  var is_ng = false;
  Array.prototype.slice.call(el.attributes).filter(function(attr) {
    if(/^_ng/.test(attr.name)){
      is_ng = true;
      return;
    }
  });
  return is_ng;
}

function getNgElements() {
  var elements = [];
  Array.prototype.slice.call(document.querySelectorAll('*')).filter(function (el) {
    if (isNgElement(el)) {
      elements.push(el);
    }
  });
  return elements;
}
var elems = getNgElements(/^_nghost/);
for (elem of elems) {
  console.log(elem);
  elem.addEventListener('focus', (event) => {
    console.log(ng.probe(event.target));
  }, true);
}