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diff --git a/gfx/wr/wrench/reftests/filters/filter-mix-blend-scaling.yaml b/gfx/wr/wrench/reftests/filters/filter-mix-blend-scaling.yaml
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+# Tests that mix-blend mode content renders correctly when in a scaled surface.
+# See bug 1642549
+---
+root:
+ items:
+ - type: stacking-context
+ bounds: 0 0 0 0
+ # Force WebRender to form a raster root
+ transform: perspective(1000)
+ items:
+ - type: stacking-context
+ bounds: -50 -50 0 0
+ # The raster root will have a 2x scaling factor
+ transform: scale(2)
+ blend-container: true
+ items:
+ - rect: 0 0 100 100
+ color: green
+ - type: stacking-context
+ mix-blend-mode: multiply
+ items:
+ - rect: 0 0 100 100
+ color: white