I have been looking everywhere for this without any luck. If you go to google.com on the iphone when you focus in on the search field a little \'x\' appears all the way in t
This is a special type of input developed by Apple and not approved by the W3C. If you use it, it works fine on browsers that don't recognize it.
There are other parameters, including domain name and search results so the user can use their search history. Google for how to use those.