Created attachment 8440236 [details] zOrder_test.html User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release) Build ID: 20140608211622 Steps to reproduce: Add a parent with transform-style:preserve-3d Add exactly 100 children with position:absolute / translate3d(0px,0px,2px) Add one node with a lower Z depth eg: translate3d(8px,8px,1px) Actual results: Last node appears on top of the stack. Expected results: Last node should appear under the stack. This works correctly unless the number of nodes exceeds 100 elements, even if some of those are in a different stacking context.
2014-06-16-03-02-03-mozilla-central-firefox-33.0a1.en-US.linux-x86_64 Firefox 30.0 With the testcase, the blue square with the number shows on top of the red square; opposite with the "OK" testcase. Reproduced?