[Webkit-unassigned] [Bug 220593] New: Failed HTML validation will lead to double elements after zooming

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220593

            Bug ID: 220593
           Summary: Failed HTML validation will lead to double elements
                    after zooming
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: christian.burtchen at data4life.care

Created attachment 417541

  --> https://bugs.webkit.org/attachment.cgi?id=417541&action=review

Screenshot from example project

This issue does not reproduce with macOS as far as I could test. On an iPhone 11 running iOS 14.3, we could reliably reproduce it in both production code as well as simplified version:

- have a form with HTML validation, such as an input date element with a maximum date (see example) or a required radio choice
- provide input that is invalid, such as a date beyond the range and submit, or attempt to submit without the required radio choice
- as expected, submission itself will not work, and the Webkit UI will provide feedback on what failed
- zooming NOW (pinch to zoom on iOS for instance), the Submit button will appear multiple times during the zoom process while other elements are scaled properly and appear only once

Example screenshot attached, super minimalist example at https://2300h.csb.app/

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