I filed a bug report (FB20465338) but I also want to note some more details here in case this is useful to someone: When navigating back/forward in a WebView or WKWebView, the page suddenly jumps up. The reason appears to be that WebKit automatically adds some padding to the top of the webpage to account for the unsafe nav bar area, but it then forgets to account for this padding when navigating back/forward. The effect is especially pronounced if you swipe back/forward. When swiping you see a static preview of the incoming page, but when you release the swipe, the page suddenly jumps up. As far as I can tell, this has always been an issue, but before iOS 26 it wasn't really a problem because the WebView would usually be flush against a solid nav bar. However, in iOS 26, this bug is problematic because Apple is asking us to flow the web content behind the nav bar; indeed, this is the default behavior of a WebView. There's effectively no good solution in iOS 26 because you basically have two