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→[http://groups.google.ca/group/mozilla.dev.tech.xul/browse_thread/thread/0e44d61bec2604be/55d6bfd713e5ba45?hl=en#55d6bfd713e5ba45 DrawWindow with transparent background possible?]
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:This makes canvas background transparent if background is transparent.But but when "window" is coming from top level content window, background isnot transparent.
:So how can I do this same way as <iframe>? You can't right now
