diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 30b5ca2eafc..d3ac24d0498 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -137,7 +137,6 @@ prefs:"layout.writing-mode.enabled" == iframe/size_attributes_vertical_writing_m
== inline_block_parent_width_percentage.html inline_block_parent_width_ref.html
== inline_block_stacking_context_a.html inline_block_stacking_context_ref.html
# inline_border_a.html inline_border_b.html
-== inline_hypothetical_box_a.html inline_hypothetical_box_ref.html
== inline_margin_multiple_fragments_a.html inline_margin_multiple_fragments_ref.html
== inline_whitespace_a.html inline_whitespace_ref.html
== inline_whitespace_b.html inline_whitespace_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 7b6887c13a9..46bf2688a32 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -743,6 +743,18 @@
"url": "/_mozilla/css/inline_element_border_a.html"
}
],
+ "css/inline_hypothetical_box_a.html": [
+ {
+ "path": "css/inline_hypothetical_box_a.html",
+ "references": [
+ [
+ "/_mozilla/css/inline_hypothetical_box_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/inline_hypothetical_box_a.html"
+ }
+ ],
"css/inline_margins_a.html": [
{
"path": "css/inline_margins_a.html",
@@ -4236,6 +4248,18 @@
"url": "/_mozilla/css/inline_element_border_a.html"
}
],
+ "css/inline_hypothetical_box_a.html": [
+ {
+ "path": "css/inline_hypothetical_box_a.html",
+ "references": [
+ [
+ "/_mozilla/css/inline_hypothetical_box_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/inline_hypothetical_box_a.html"
+ }
+ ],
"css/inline_margins_a.html": [
{
"path": "css/inline_margins_a.html",
diff --git a/tests/ref/inline_hypothetical_box_a.html b/tests/wpt/mozilla/tests/css/inline_hypothetical_box_a.html
similarity index 88%
rename from tests/ref/inline_hypothetical_box_a.html
rename to tests/wpt/mozilla/tests/css/inline_hypothetical_box_a.html
index 3b07324daa6..0406a275a9c 100644
--- a/tests/ref/inline_hypothetical_box_a.html
+++ b/tests/wpt/mozilla/tests/css/inline_hypothetical_box_a.html
@@ -1,6 +1,7 @@
+