[Webkit-unassigned] [Bug 273371] New: Inconsistency: click event inside dialog Shadow DOM on iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273371

            Bug ID: 273371
           Summary: Inconsistency: click event inside dialog Shadow DOM on
                    iOS
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com

Created attachment 471188

  --> https://bugs.webkit.org/attachment.cgi?id=471188&action=review

Example HTML demonstrating the issue

Steps to reproduce:
1. Open the attached example HTML
2. Open the web inspector
3. Click the "Shadow?" checkbox
4. Click the link

Expected results: "click shadow button" is not logged in the console

Actual results: "click shadow button" is logged in the console

The expected results occur for all desktop web browsers: Safari, Chrome, Firefox. Mobile Safari's behavior is inconsistent with those.

Discussion: The pointerdown event on the link calls preventDefault and shows a modal dialog. The example HTML has two dialogs, one of which is chosen by the Shadow? checkbox. Each dialog has a button inside, but one button is inside the Shadow DOM and one not. When the button is not inside the Shadow DOM, it doesn't receive a click event as a result of clicking on the link. When the button is inside the Shadow DOM, it doesn't receive a click event on desktop either but does on iOS.

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