[Webkit-unassigned] [Bug 214970] New: [iOS] Calling preventDefault() in a pointerdown event handler for an <img> does not prevent system drag

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214970

            Bug ID: 214970
           Summary: [iOS] Calling preventDefault() in a pointerdown event
                    handler for an <img> does not prevent system drag
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at webkit.org

Consider this simple markup:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAQAAADa613fAAAAaUlEQVR42u3PQREAAAgDoK1/aI3g34MGNJMXKiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiJyWXmfZAEMq/KNAAAAAElFTkSuQmCC" onpointerdown="event.preventDefault()">

On macOS, the fact that `event.preventDefault()` is called while handling the `pointerdown` event makes it so that the image cannot be dragged. On iOS the image is draggable after a long press, but I think it should not be to match both the macOS behavior and developer expectation.

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