code: function isElement(node) {
    return !!(node &&
      (node.nodeName  // we are a direct element
      || (node.prop && node.attr && node.find)));  // we have an on and find method part of jQuery API
  }
docs: @ngdoc function
  @name angular.isElement
  @module ng
  @kind function
  
  @description
  Determines if a reference is a DOM element (or wrapped jQuery element).
  
  @param {*} value Reference to check.
  @returns {boolean} True if `value` is a DOM element (or wrapped jQuery element).