code: function isInternalLink( url, host ) {
  	const parsedUrl = urlMethods.parse( url, false, true );
  	// Check if the URL starts with a single slash.
  	if ( url.indexOf( "//" ) === -1 && url.indexOf( "/" ) === 0 ) {
  		return true;
  	}
  
  	// Check if the URL starts with a # indicating a fragment.
  	if ( url.indexOf( "#" ) === 0 ) {
  		return false;
  	}
  
  	// No host indicates an internal link.
  	if ( ! parsedUrl.host ) {
  		return true;
  	}
  
  	return parsedUrl.host === host;
  }
docs: Determine whether a URL is internal.
  
  @param {string} url The URL to test.
  @param {string} host The current host.
  
  @returns {boolean} Whether or not the URL is internal.