Symmetry aperture lab
Selected Variation
Symbol Iris
Filled BB geometry mirrored as two aperture halves.
Exact left/right mirror
Center mark +15%
Bright and dark
No text in wiper
Internal Link Test
Preview navigation timing.
These links show the selected symmetrical wiper before navigation.
Exclusion Test
Should stay native.
These controls keep the same safety checks without opening local apps during review.
Route expectation after staging setup: /page-transition-bb-symmetry-lab/. This is a lab-only review page, not a sitewide rollout.