Resource Hints

resource-hints.html

<!-- pre-DNS resolve a domain -->
<link rel="dns-prefetch" href="//widget.com"> 

<!-- pre-connect to a domain HTTP endpoint -->
<link rel="preconnect" href="//cdn.example.com"> 

<!-- pre-fetch a resource, here an
     image needed on the page -->
<link rel="prefetch" href="//example.com/logo.jpg" as="image"> 

<!-- pre-render a web page, here for
     the next page of an article -->
<link rel="prerender" href="//example.com/next-page.html">