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When we are looking at a transform of an element relative to the surface it's rendered into, we used to only consider the final transformation when determining back-face visibility. However, in case there are any Flat reference frames on the way, the transformation is flattened. We should be checking for back-face visibility on each such step. This doc was helpful, although it doesn't have all the answers: https://docs.google.com/document/d/1yb4a_uhTG3KmcbGPta4B9p67v1HO_qY8ZMk-otGOwTc/ Differential Revision: https://phabricator.services.mozilla.com/D92135