diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 9631eefb259..245fd1b8981 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -299,7 +299,6 @@ resolution=300x300,device-pixel-ratio=2 != pixel_snapping_position_a.html pixel_
== servo_center_a.html servo_center_ref.html
== setattribute_id_restyle_a.html setattribute_id_restyle_b.html
== simple_inline_absolute_containing_block_a.html simple_inline_absolute_containing_block_ref.html
-== stacked_layers.html stacked_layers_ref.html
# text_decoration_propagation_a.html text_decoration_propagation_b.html
!= text_decoration_smoke_a.html text_decoration_smoke_ref.html
!= text_decoration_underline_subpx_a.html text_decoration_underline_subpx_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index c579a81980c..a471cc82118 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -591,6 +591,18 @@
"url": "/_mozilla/css/setpropertypriority.html"
}
],
+ "css/stacked_layers.html": [
+ {
+ "path": "css/stacked_layers.html",
+ "references": [
+ [
+ "/_mozilla/css/stacked_layers_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/stacked_layers.html"
+ }
+ ],
"css/stacking_context_overflow_a.html": [
{
"path": "css/stacking_context_overflow_a.html",
@@ -2624,6 +2636,18 @@
"url": "/_mozilla/css/setpropertypriority.html"
}
],
+ "css/stacked_layers.html": [
+ {
+ "path": "css/stacked_layers.html",
+ "references": [
+ [
+ "/_mozilla/css/stacked_layers_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/stacked_layers.html"
+ }
+ ],
"css/stacking_context_overflow_a.html": [
{
"path": "css/stacking_context_overflow_a.html",
diff --git a/tests/ref/stacked_layers.html b/tests/wpt/mozilla/tests/css/stacked_layers.html
similarity index 94%
rename from tests/ref/stacked_layers.html
rename to tests/wpt/mozilla/tests/css/stacked_layers.html
index 615acb0b3c9..6cd0141a27d 100644
--- a/tests/ref/stacked_layers.html
+++ b/tests/wpt/mozilla/tests/css/stacked_layers.html
@@ -1,6 +1,7 @@
+