[Webkit-unassigned] [Bug 218138] New: MouseEvent.offsetX/Y: Caching of values may create unexpected results

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218138

            Bug ID: 218138
           Summary: MouseEvent.offsetX/Y: Caching of values may create
                    unexpected results
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: noam at webkit.org

See https://github.com/w3c/csswg-drafts/issues/1070
Currently, offsetX/Y are computed at the first time they are requested rather than when the event is dispatched.
This means that if there is a layout between the time of the event and the time of the call to event.offsetX/Y, the results would not match the spec, and may also create an undesired synchronous layout.

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