title: Get domain name without subdomains using JavaScript?
body: <p>How to get the domain name without subdomains?</p>
  
  <p>e.g. if the url is "<a href="http://one.two.roothost.co.uk/page.html" rel="noreferrer">http://one.two.roothost.co.uk/page.html</a>" how to get "roothost.co.uk"?</p>