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diff --git a/gfx/wr/wrench/reftests/boxshadow/scale.yaml b/gfx/wr/wrench/reftests/boxshadow/scale.yaml
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+++ b/gfx/wr/wrench/reftests/boxshadow/scale.yaml
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+# Test that box shadows are drawn with correct symmetry in
+# a variety of cases. This test checks for various scale
+# factors, in combination with box shadows clipped by the
+# screen rect. It also has come large box shadows that check
+# the symmetry still works with segmentation enabled.
+---
+root:
+  items:
+    - type: stacking-context
+      transform: scale(0.3)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 50, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.4)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 150, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.5)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 250, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.6)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 350, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.7)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 450, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.73)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 550, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.75)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 650, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.77)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 750, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.8)
+      items:
+        - type: box-shadow
+          bounds: [ -70, 850, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      items:
+        - type: box-shadow
+          bounds: [ -70, 800, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+
+    - type: stacking-context
+      transform: scale(0.3)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 50, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.4)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 150, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.5)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 250, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.6)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 350, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.7)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 450, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.73)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 550, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.75)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 650, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.77)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 750, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      transform: scale(0.8)
+      items:
+        - type: box-shadow
+          bounds: [ 50, 850, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+    - type: stacking-context
+      items:
+        - type: box-shadow
+          bounds: [ 50, 800, 100, 100 ]
+          color: black
+          blur-radius: 1
+          clip-mode: inset
+
+    - type: stacking-context
+      items:
+        - type: box-shadow
+          bounds: [ 200, -100, 600, 200 ]
+          color: black
+          blur-radius: 5
+          clip-mode: inset
+
+    - type: stacking-context
+      items:
+        - type: box-shadow
+          bounds: [ 200, 200, 600, 200 ]
+          color: black
+          blur-radius: 5
+          clip-mode: outset