diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index ca99b1bdcc6..68a0144a64f 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -19,7 +19,6 @@ flaky_cpu == append_style_a.html append_style_b.html
== borders_a.html borders_b.html
== box_shadow_bg.html box_shadow_bg_ref.html
!= box_shadow_blur_a.html box_shadow_blur_ref.html
-== box_shadow_border_box_a.html box_shadow_border_box_ref.html
== box_shadow_default_color_a.html box_shadow_default_color_ref.html
== box_shadow_inset_a.html box_shadow_inset_ref.html
== box_shadow_inset_parsing_a.html box_shadow_inset_parsing_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index b1f78fe8a91..7afa5ee0df5 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -779,6 +779,18 @@
"url": "/_mozilla/css/border_spacing_a.html"
}
],
+ "css/box_shadow_border_box_a.html": [
+ {
+ "path": "css/box_shadow_border_box_a.html",
+ "references": [
+ [
+ "/_mozilla/css/box_shadow_border_box_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/box_shadow_border_box_a.html"
+ }
+ ],
"css/box_shadow_inset_bg.html": [
{
"path": "css/box_shadow_inset_bg.html",
@@ -5220,6 +5232,18 @@
"url": "/_mozilla/css/border_spacing_a.html"
}
],
+ "css/box_shadow_border_box_a.html": [
+ {
+ "path": "css/box_shadow_border_box_a.html",
+ "references": [
+ [
+ "/_mozilla/css/box_shadow_border_box_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/box_shadow_border_box_a.html"
+ }
+ ],
"css/box_shadow_inset_bg.html": [
{
"path": "css/box_shadow_inset_bg.html",
diff --git a/tests/ref/box_shadow_border_box_a.html b/tests/wpt/mozilla/tests/css/box_shadow_border_box_a.html
similarity index 86%
rename from tests/ref/box_shadow_border_box_a.html
rename to tests/wpt/mozilla/tests/css/box_shadow_border_box_a.html
index e64f478dcc7..3bff2a2ee2c 100644
--- a/tests/ref/box_shadow_border_box_a.html
+++ b/tests/wpt/mozilla/tests/css/box_shadow_border_box_a.html
@@ -1,4 +1,5 @@
+