title: Does Safari on iOS support the DNS Prefetch directive?
body: <p>I've recently come across the DNS Prefetch directive as part of the HTML5 Boilerplate template.  According to <a href="http://en.wikipedia.org/wiki/Link_prefetching#HTML5_prefetching" rel="noreferrer">Wikipedia</a>:</p>
  
  <blockquote>
    <p>Prefetching is not currently explicitly defined by any accepted standards, but Mozilla have announced work on an Internet Draft, that will match the implementation in Firefox.</p>
  
  <pre><code>&lt;link rel="prefetch" href="http://www.example.com/"&gt;
  </code></pre>
  </blockquote>
  
  <p>I read information that back in September 2010, there was a <a href="http://www.macworld.com/article/154149/2010/09/dns_prefetching.html" rel="noreferrer">fix for Safari 5.0.1</a> that fixed slow/stalled page loads when DNS Prefetch directives were present. However, I couldn't any information on whether <strong>Safari on iOS</strong> supports the DNS Prefetch.</p>
  
  <p>We are building some HTML 5 pages that are loaded exclusively in a UIWebView within an iOS app. On this page there are a few external resources we're loading so I'd like to improve page load times and use the DNS Prefetch if it's going to help.</p>