Siblings never cross in Z (paint order = z-index/source only, paint_pass.rs:311-316); backface-visibility doesn't exist. Opt-in container flag depth_sort: true → sort children by resolved translate_z at paint time; backface-visibility: hidden skips paint when the 3D normal faces away. Schedule with/after 3D shadows.
Siblings never cross in Z (paint order = z-index/source only, paint_pass.rs:311-316); backface-visibility doesn't exist. Opt-in container flag depth_sort: true → sort children by resolved translate_z at paint time; backface-visibility: hidden skips paint when the 3D normal faces away. Schedule with/after 3D shadows.