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Designers will not be able to get reproduce-able results across browsers unless this is specified. Examples of this problem now, see the difference between Chrome and Safari's rendering of 3 intersecting planes. http://greggman.com/downloads/examples/correct-3d-css-polygon-sorting-subdivisions-safari.png http://greggman.com/downloads/examples/incorrect-3d-css-polygon-sorting-subdivisions-chrome.png
Does the new text in <http://dev.w3.org/csswg/css3-transforms/#transform-3d-rendering> help?
Could we change the "should" to a "must"? "Should"s are bad for interop. Currently I think only Safari gets this right (reportedly -- I haven't been able to test).
*** Bug 15783 has been marked as a duplicate of this bug. ***
We resolved on the call today to make the intersection behavior required.
Fixed in 4abce06156b6c794712490459e194977e908dda1.