[Webkit-unassigned] [Bug 138033] New: getBoundingClientRect on elements inside an SVG with non-default viewBox is incorrect

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138033

            Bug ID: 138033
           Summary: getBoundingClientRect on elements inside an SVG with
                    non-default viewBox is incorrect
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mmfrezabakhshi at yahoo.co.uk

Created attachment 240380
  --> https://bugs.webkit.org/attachment.cgi?id=240380&action=review
minimal html page

in the attached html page there are two similar SVG elements, one is zoomed (by setting its viewbox set to 4 times the size of actual svg) and the other one normal (its viewbox the same size as the SVG).
the RECT element inside "zoomed" SVG reports its "getBoundingClientRect" the same as the "normal" one despite the fact that the are in different locations on relative to the page.

they both report "111" as their "left" which is "100 translate + 1pixel border of SVG + 9px padding of body + 1px border of body).

the expected value for the zoomed one is 61 which is:
   100/2 = 50 pixel position of RECT inside SVG
   1px border size of SVG
   9px padding of body
   1px border of body

which makes it 61px.

this also results in wrong behaviour of Safari websinpector! if you hover the mouse over RECT in zoomed SVG in "elements" panel of webinspector to highlight the actual element, it displays a wrong spot on the page.

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