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diff --git a/gfx/wr/wrench/reftests/compositor-surface/underlay.yaml b/gfx/wr/wrench/reftests/compositor-surface/underlay.yaml
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+++ b/gfx/wr/wrench/reftests/compositor-surface/underlay.yaml
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+# Verify that we correctly display an underlay style compositor
+# surface when an overlapping translucent compositor surface
+# exists earlier in the display list.
+# Reference image is public-domain - https://en.wikipedia.org/wiki/File:Barn-yuv.png
+---
+root:
+  items:
+    - type: rect
+      bounds: [0, 0, 500, 550]
+      color: white
+    - image: solid-color(255,0,0,128,299,299)
+      bounds: [100, 100, 299, 299]
+      prefer-compositor-surface: true
+    - type: yuv-image
+      format: planar
+      src-y: barn-y.png
+      src-u: barn-u.png
+      src-v: barn-v.png
+      bounds: [100, 100, 299, 299]
+      prefer-compositor-surface: true
+    - text: "Prohibited subpixel AA"
+      origin: 110 380
+      size: 20
+      color: white
+      font: "FreeSans.ttf"
+    - text: "Allowed subpixel AA"
+      origin: 110 480
+      size: 20
+      color: black
+      font: "FreeSans.ttf"