[Webkit-unassigned] [Bug 207049] New: [iOS] Scroll bugs when focusing on an input with position fixed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207049

            Bug ID: 207049
           Summary: [iOS] Scroll bugs when focusing on an input with
                    position fixed
           Product: WebKit
           Version: Other
          Hardware: Other
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pierbover11 at gmail.com

1) When an input field is in a fixed position the scroll jumps in an unexpected manner when the user focuses on the input field.

2) When the input is focused and user scrolls the input can disappear from the viewport.

On both bugs the behavior is the same regardless of whether virtual keyboard is visible or not.

I've reproduced this on iOS 11.4 on the iPhone simulator. Since I'm on High Sierra I cannot test on other iOS versions. I don't have access to a real iPhone to test.

I've tested on an iPad Pro with iOS 12.4. I could only reproduce #2.

You can see the bug in action here: https://www.youtube.com/watch?v=Daa_ctnhG00

Here is the code to reproduce: https://github.com/PierBover/webkit-ios-input-scroll-bug/blob/master/index.html

Here is the rendered HTML to test: https://htmlpreview.github.io/?https://github.com/PierBover/webkit-ios-input-scroll-bug/blob/master/index.html

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