returnElementId(el) {
    return el.id !== "" ? el.id : el.name !== "" ? "".concat(el.name, "-").concat(++__privateWrapper(this, _uniqueElID)._) : el.type ? "".concat(el.type, "-").concat(++__privateWrapper(this, _uniqueElID)._) : "".concat(el.localName, "-").concat(++__privateWrapper(this, _uniqueElID)._);
  }
Get or create a (hopefully) unique ID
@param {HTMLFormElement} el Source form element
@returns {string|null} A hopefully unique element ID