[Webkit-unassigned] [Bug 250621] New: Initial container block (ICB) resizes in in-app browsers when scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250621

            Bug ID: 250621
           Summary: Initial container block (ICB) resizes in in-app
                    browsers when scrolling
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rogierderuijter at hotmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 464498

  --> https://bugs.webkit.org/attachment.cgi?id=464498&action=review

Video of the ICB changing

When this page: https://interop-2022-viewport.netlify.app is opened on an in-app browser on iOS. You can see (also see video in attachment) that when you start scrolling the ICB (the red line) changes size. This is a problem for view height units (vh, svh) since they will resize and your scroll position on the page changes.

The preferred behaviour would be that the ICB doesn't change like on Safari mobile.

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