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-rw-r--r--gfx/wr/wrench/reftests/backface/backface-perspective.yaml20
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diff --git a/gfx/wr/wrench/reftests/backface/backface-perspective.yaml b/gfx/wr/wrench/reftests/backface/backface-perspective.yaml
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+++ b/gfx/wr/wrench/reftests/backface/backface-perspective.yaml
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+# Checks a special case where CSS has both perspective and a transform.
+# In this case, the backface visibility should be computed based on the perspective
+# parent, not the immediate parent.
+# The immediate parent is `rotate-y(-120)`, which is obviously back facing.
+# But perspective transform makes it front-facing (since the frustum side panels are rotated even more).
+root:
+ items:
+ - type: stacking-context
+ bounds: 0 0 300 100
+ perspective: 100
+ items:
+ - type: stacking-context
+ bounds: 0 0 100 100
+ transform: rotate-y(-120)
+ paired-with-perspective: true
+ backface-visible: false
+ items:
+ - type: rect
+ bounds: 0 0 100 100
+ color: red