On Friday, December 17, 2010 10:53:59 PM UTC+1, Matthew Hill wrote:
>
> What is the iframe on the host page for?


It's for IE6 and 7, and only those 2 browsers, because manipulating the 
window.location has no effect in their navigation history.
 

> Could it not be inserted programmatically?


I think it could, given that other toolkits are doing it (YUI3 for 
instance: http://developer.yahoo.com/yui/3/history/#migrating-key , jQuery 
history: http://plugins.jquery.com/project/history) 

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