GetComputedStyle returning "auto"

hi, i'm writing a c++ program that attempts to get position (ie, pixel
coordinates) of DOM nodes (text, img, table, etc) on a rendered page.  I
thought GetComputedStyle with "left" and "top" would do it, but those
are just returning "auto"?  DOM Inspector confirms this value.

what i want is what the Box Model in DOM Inspector reports for (x, y)
for all nodes in the document.  how can i do this?  thank you very much.
i'm using 1.7.3 btw.

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Xiaolei Li        |       xli10@xxxxxxxx       |        www.xiaolei.org