code: function replacementForNode(node) {
      var rule = this.rules.forNode(node);
      var content = process.call(this, node); // get's internal content of node
      return rule.replacement(content, node);
  }
docs: Converts an element node to its Adaptive Card equivalent
  @private
  @param {HTMLElement} node The node to convert
  @returns An Adaptive Card representation of the node
  @type String