title: how to access IFA from browser on iOS6
body: <p><a href="http://www.businessinsider.com/ifa-apples-iphone-tracking-in-ios-6-2012-10" rel="noreferrer">Here and there</a> on the web are articles about Identifier for Advertisers (IFA), introduced on iOS6. How can it be accessed from WebApplication (i.e. from Javascript that runs in the mobile browser)?</p>
  
  <p>Actually any well-working/well-formed way to track user context for ads relevance will be mostly welcomed.</p>