How can I disable hardware acceleration in Safari 5.1 ?

for performance testing purposes, I need to do so. Specifically, to disable 2D Canvas hardware acceleration.
I can't figure out how. Is there any way? I am on Mac. I would like to know about how to do so both on Mac and Windows.

You can switch acclelerated compositing and accelerated canvas drawing on and off from the Debug menu. To enable this menu run
defaults write com.apple.safari IncludeInternalDebugMenu 1

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