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"The matrix is computed by starting with an identity matrix and replacing the value at row 3, column 4 with the value -1/depth." http://dev.w3.org/csswg/css3-3d-transforms/#transform-functions This should say "row 4, column 3". This matches both Firefox 12.0a1 and Chrome 17 dev in my testing. Row 3, column 4 would mean perspective(X) is the same as translateZ(-1/X).
I agree. I'll fix that with the next commit.
I clarified that with the new mathematical description section.
Great, thanks.