diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 52e2129ff96..48b32b4033c 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -49,7 +49,6 @@ resolution=300x300,device-pixel-ratio=2 != pixel_snapping_position_a.html pixel_
# == position_fixed_simple_a.html position_fixed_simple_b.html
# == position_fixed_static_y_a.html position_fixed_static_y_b.html
# text_decoration_propagation_a.html text_decoration_propagation_b.html
-!= text_decoration_underline_subpx_a.html text_decoration_underline_subpx_ref.html
!= text_overflow_a.html text_overflow_ref.html
flaky_cpu,prefs:"layout.writing-mode.enabled" == vertical-lr-blocks.html vertical-lr-blocks_ref.html
prefs:"layout.viewport.enabled" == viewport_meta.html viewport_rule_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index f5e77833b19..deeae61c0ce 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -4063,6 +4063,18 @@
"url": "/_mozilla/css/text_decoration_smoke_a.html"
}
],
+ "css/text_decoration_underline_subpx_a.html": [
+ {
+ "path": "css/text_decoration_underline_subpx_a.html",
+ "references": [
+ [
+ "/_mozilla/css/text_decoration_underline_subpx_ref.html",
+ "!="
+ ]
+ ],
+ "url": "/_mozilla/css/text_decoration_underline_subpx_a.html"
+ }
+ ],
"css/text_indent_a.html": [
{
"path": "css/text_indent_a.html",
@@ -9468,6 +9480,18 @@
"url": "/_mozilla/css/text_decoration_smoke_a.html"
}
],
+ "css/text_decoration_underline_subpx_a.html": [
+ {
+ "path": "css/text_decoration_underline_subpx_a.html",
+ "references": [
+ [
+ "/_mozilla/css/text_decoration_underline_subpx_ref.html",
+ "!="
+ ]
+ ],
+ "url": "/_mozilla/css/text_decoration_underline_subpx_a.html"
+ }
+ ],
"css/text_indent_a.html": [
{
"path": "css/text_indent_a.html",
diff --git a/tests/ref/text_decoration_underline_subpx_a.html b/tests/wpt/mozilla/tests/css/text_decoration_underline_subpx_a.html
similarity index 79%
rename from tests/ref/text_decoration_underline_subpx_a.html
rename to tests/wpt/mozilla/tests/css/text_decoration_underline_subpx_a.html
index 36dea4951ba..700641537a8 100644
--- a/tests/ref/text_decoration_underline_subpx_a.html
+++ b/tests/wpt/mozilla/tests/css/text_decoration_underline_subpx_a.html
@@ -3,6 +3,7 @@
Underline test
+