[Webkit-unassigned] [Bug 218117] New: MouseEvent.offsetX/Y returns wrong value for inline elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218117

            Bug ID: 218117
           Summary: MouseEvent.offsetX/Y returns wrong value for inline
                    elements
           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

According to spec (https://drafts.csswg.org/cssom-view/#dom-mouseevent-offsetx), offsetX/offsetY should return the values relative to the element's padding edge.
Firefox does this correctly, WebKit (and also Chromium, currently), return the value relative to the nearest block ancestor. 

See https://codepen.io/noamr-the-selector/pen/WNxRbmZ

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