gecko-dev
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Ability to set strict z-ordering of CSS VR content.
Currently, all CSS VR content share the same 3D context. This can be a problem in cases where we want elements to always render on-top regardless of their spatial positioning (ie. for HUD elements).
One solution could be to use the css z-index property.
The solution for this is proper depth buffering, which isn't available yet. It's on kip's list of things to look at once he finishes up with the transform bugs.
FIled into bugzilla https://bugzilla.mozilla.org/show_bug.cgi?id=1171771