[Webkit-unassigned] [Bug 176896] New: Wrong caret position for input field inside a fixed position parent on iOS 11

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176896

            Bug ID: 176896
           Summary: Wrong caret position for input field inside a fixed
                    position parent on iOS 11
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: daria at kayak.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 320762

  --> https://bugs.webkit.org/attachment.cgi?id=320762&action=review

Screenshot of mispositioned caret

If input field is located inside a parent which has position: fixed AND page content is more than height of the screen, then when typing inside this input field the caret is mispositioned (floats somewhere below)

If page content is less than height of the screen, then the caret is positioned properly.

Please see jsbin for example: http://jsbin.com/pivahiwide/

The issue happens on Chrome and Safari browsers on mobile devices with iOS 11.

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