diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 515d8c8a0b2..606821ab25c 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -239,7 +239,6 @@ flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
== per_glyph_font_fallback_a.html per_glyph_font_fallback_ref.html
== percent_height.html percent_height_ref.html
== percentage_height_float_a.html percentage_height_float_ref.html
-== percentage_height_root.html percentage_height_root_ref.html
== percentage_width_inline_block_a.html percentage_width_inline_block_ref.html
resolution=300x300,device-pixel-ratio=2 != pixel_snapping_border_a.html pixel_snapping_border_ref.html
resolution=300x300,device-pixel-ratio=2 != pixel_snapping_position_a.html pixel_snapping_position_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 6bc8af57ddd..02a3fc9e1a3 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/percentage_height_root.html": [
+ {
+ "path": "css/percentage_height_root.html",
+ "references": [
+ [
+ "/_mozilla/css/percentage_height_root_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/percentage_height_root.html"
+ }
+ ],
"css/png_rgba_colorspace_a.html": [
{
"path": "css/png_rgba_colorspace_a.html",
@@ -3276,6 +3288,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/percentage_height_root.html": [
+ {
+ "path": "css/percentage_height_root.html",
+ "references": [
+ [
+ "/_mozilla/css/percentage_height_root_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/percentage_height_root.html"
+ }
+ ],
"css/png_rgba_colorspace_a.html": [
{
"path": "css/png_rgba_colorspace_a.html",
diff --git a/tests/ref/percentage_height_root.html b/tests/wpt/mozilla/tests/css/percentage_height_root.html
similarity index 84%
rename from tests/ref/percentage_height_root.html
rename to tests/wpt/mozilla/tests/css/percentage_height_root.html
index ba90dd5450f..3b3d5486702 100644
--- a/tests/ref/percentage_height_root.html
+++ b/tests/wpt/mozilla/tests/css/percentage_height_root.html
@@ -1,6 +1,7 @@
+