code: function enqueuePage(instance, url, customData)
  {
  	// Avoid links to self within page
  	instance.sitePagesChecked.set(url, true);
  	
  	instance.htmlUrlChecker.enqueue(url, customData);
  }
docs: /*SiteChecker.prototype.__getCache = function()
  {
  return this.htmlUrlChecker.__getCache();
  }; ::: PRIVATE FUNCTIONS