[Webkit-unassigned] [Bug 275350] New: Changing the width value of WKWebView allows the displayed website to be moved to a larger size

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275350

            Bug ID: 275350
           Summary: Changing the width value of WKWebView allows the
                    displayed website to be moved to a larger size
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fuka.takashima at dena.jp

Created attachment 471647

  --> https://bugs.webkit.org/attachment.cgi?id=471647&action=review

screen recording

When the iPhone is in Landscape, changing the width value of WKWebView may allow a website displayed in WKWebView to be moved larger.
When displaying the Apple website, this bug occurs at the following widths. 
- iPhone 15
  - wkweview width: 331.0, web content width: 331.0
  - wkweview width: 338.5, web content width: 338.0
- iPhone 15 Pro
  - wkweview width: 332.0, web content width: 332.0
  - wkweview width: 400.5, web content width: 400

web content width is the width of the website as verified by Safari's Web Inspector.
The width at which this bug reproduces may vary depending on the device and the website being viewed.
I have confirmed that the element does not overhang using Safari's WebInspector. I don't think it's a viewport issue, as sometimes it doesn't go away even after page transitions.
We have created a sample application to reproduce this issue. You can build and check it.
https://github.com/f426k/webview-sample-app
I have attached a screen recording and screenshot of when this bug is reproduced.

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