diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index c633be9cee2..ca8fc2b2371 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -230,7 +230,6 @@ flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
== overflow_position_abs_inline_block.html overflow_position_abs_inline_block_ref.html
# Should be ==?
!= overflow_position_abs_inside_normal_a.html overflow_position_abs_inside_normal_b.html
-== overflow_position_abs_simple_a.html overflow_position_abs_simple_b.html
== overflow_scroll.html overflow_simple_b.html
== overflow_simple_a.html overflow_simple_b.html
resolution=300x300,device-pixel-ratio=2 != pixel_snapping_border_a.html pixel_snapping_border_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 503d1ba05f9..a3cca0709e1 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -683,6 +683,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/overflow_position_abs_simple_a.html": [
+ {
+ "path": "css/overflow_position_abs_simple_a.html",
+ "references": [
+ [
+ "/_mozilla/css/overflow_position_abs_simple_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/overflow_position_abs_simple_a.html"
+ }
+ ],
"css/overflow_position_rel_inline_block.html": [
{
"path": "css/overflow_position_rel_inline_block.html",
@@ -3372,6 +3384,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/overflow_position_abs_simple_a.html": [
+ {
+ "path": "css/overflow_position_abs_simple_a.html",
+ "references": [
+ [
+ "/_mozilla/css/overflow_position_abs_simple_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/overflow_position_abs_simple_a.html"
+ }
+ ],
"css/overflow_position_rel_inline_block.html": [
{
"path": "css/overflow_position_rel_inline_block.html",
diff --git a/tests/ref/overflow_position_abs_simple_a.html b/tests/wpt/mozilla/tests/css/overflow_position_abs_simple_a.html
similarity index 85%
rename from tests/ref/overflow_position_abs_simple_a.html
rename to tests/wpt/mozilla/tests/css/overflow_position_abs_simple_a.html
index 315b48bf8db..95191fdcec1 100644
--- a/tests/ref/overflow_position_abs_simple_a.html
+++ b/tests/wpt/mozilla/tests/css/overflow_position_abs_simple_a.html
@@ -1,5 +1,6 @@
+