[Webkit-unassigned] [Bug 29219] New: Should document.elementFromPoint() takes page scroll into consideration?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=29219

           Summary: Should document.elementFromPoint() takes page scroll
                    into consideration?
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: xji at chromium.org


I am not sure whether this is a bug or not.

document.elementFromPoint() currently does not take page scroll into
consideration.
If the input parameter (x, y) is the point in viewport, it should be increased
by (document.body.scrollLeft, document.body.scrollTop), then apply zoomFactor,
in order to get the correct point in the document.

Or it is expected user to pass in (x, y) with scoll offset, such as 
(event.clientX + document.body.scrollLeft, event.clientY +
document.body.scrollTop)?

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