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When I click on the Facebook bookmark I saved to my home screen, m.facebook.com appears in Safari but the navigation bar at the bottom and the URL bar at the disappear. At first I thought I was launching the Facebook app by mistake but I verified that's not the case. Any idea why this happens?

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Agreed I bounce between the app and webapp too. They have different bugs. And yes this behavior is annoying. –  user9099 Aug 4 '11 at 1:12

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Yes, mobile sites can be programmed to remove the navigation bar whilst browsing the site. Makes for a better user experience when these elements get out of the way.

This is documented here http://developer.apple.com/library/safari/#documentation/appleapplications/reference/SafariHTMLRef/Articles/MetaTags.html

In particular the apple-mobile-web-app-capable element.

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This doesn't seem to happen if I browse to facebook from the URL bar. It seems to happen when I click on the saved link on my home screen. I find this behavior annoying. Any way to disable? –  Sajee Apr 22 '11 at 4:18
    
No, its programmed into the mobile version of facebook. Any reason you don't use the Facebook app? –  RobZolkos Apr 22 '11 at 4:22
    
So whether I access Facebook via a saved bookmark on my home screen or via typing in the URL, aren't I accessing the mobile version of Facebook? If so, why the different behavior? I like using the web version of most sites, less switching between apps. I do use the FB app occasionally when I want to post photos but I mostly use the mobile web site. –  Sajee Apr 22 '11 at 21:03
    
When you access a website via a bookmark on the home screen the rules over what a website can do are different. This allows sites that are added to the home screen to behave a little more like real apps. If you want to run the Facebook site, but stop it from hiding the navigation bar then you'll need to launch it within Safari. –  andynormancx Aug 4 '11 at 7:56

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