text: const NSHTMLElement = require('./NSHTMLElement');
  
  const {Page} = require('ui/page');
  
  module.exports = class NSPage extends NSHTMLElement {
  
    static get observedAttributes() {
      return [];
    }
  
    appendChild(child) {
      if (child.nodeType === 1) {
        super.appendChild(child);
        this.ns.content = child.ns;
      }
      return child;
    }
  
  };
  