There’s this bar that appears at the top, with an app’s icon and a link to it on the App Store. I’ve seen it on several sites, and I think this is part of iOS 6. Any idea on how to get it to show?

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This is “smart banner” appeared in iOS6, you can check for example this post or page in Apple documentation to see how to create them
Basically all you need to do is to add a
<meta>tag to your page with specific format: