chrome ubuntu bug demonstration - 3d transforms make viewport always on top
As of this writing, I can consistently reproduce this in an up-to-date Ubuntu 13.10 desktop i386 VM running the latest Chrome stable (Version 31.0.1650.57) inside the latest VirtualBox (4.3.2-90405) with the latest VirtualBox guest additions installed.
Bugs logged at https://code.google.com/p/chromium/is... and https://www.virtualbox.org/ticket/12383.