Chrome 3D CSS transform intersections not rendering properly
This is a duplicate of Why does this 3D CSS overlap instead of clip? ... According to that question it's a reported bug in webkit: https://bugzilla.mozilla.org/show_bug.cgi?id=689498:
Bug 689498 - Intersecting planes are not z-ordered properly
Alistair MacDonald 2012-04-12 12:22:25 PDT Safari & Mobile Safari no longer have this problem. The problem still exists in Chrome and Firefox.
Broken: Firefox 14.0a1 (2012-04-12) -Win7 Broken: Chrome 20.0.1096.1 -Win7 Fixed : Safari 5.1.5 (75.34.55.3) -Win7 Fixed : Mobile Safari (last updated over a month ago) -iOs
Link to test-case and screen-grabs: http://f1lt3r.com/code/3d-css-transforms-intersecting-planes-not-clipping/