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* [http://mxr.mozilla.org/mozilla-central/source/gfx/layers/composite/APZCTreeManager.cpp#900 The comment above APZCTreeManager::GetInputTransforms()]
* [https://bug935219.bugzilla.mozilla.org/attachment.cgi?id=8380975 Diagram illustrating the coordinate confusion that gave rise to bug 935219]
== Debugging APZ ==
For debugging APZ-related issues, {{bug|958596}} added logging of the APZC tree. When enabled, on every layers update, the APZC tree manager prints out the structure of the layer tree, showing which layers have an APZC, and for those layers showing some APZ-related metrics.
This logging can be turned on by setting the "apz.printtree" pref to "true".
== Main APZ-related projects on the horizon ==
