diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 4432240186a..4e5c50113bc 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -252,7 +252,6 @@ prefs:"layout.viewport.enabled" == viewport_rule.html viewport_rule_ref.html
# == webgl-context/tex_image_2d_simple.html webgl-context/tex_image_2d_simple_ref.html
flaky_macos == white_space_intrinsic_sizes_a.html white_space_intrinsic_sizes_ref.html
-== width_nonreplaced_block_simple_a.html width_nonreplaced_block_simple_b.html
== word_break_a.html word_break_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 070ef22dee7..f457f446012 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -2147,6 +2147,18 @@
"url": "/_mozilla/css/whitespace_pre.html"
}
],
+ "css/width_nonreplaced_block_simple_a.html": [
+ {
+ "path": "css/width_nonreplaced_block_simple_a.html",
+ "references": [
+ [
+ "/_mozilla/css/width_nonreplaced_block_simple_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/width_nonreplaced_block_simple_a.html"
+ }
+ ],
"css/word-spacing.html": [
{
"path": "css/word-spacing.html",
@@ -5028,6 +5040,18 @@
"url": "/_mozilla/css/whitespace_pre.html"
}
],
+ "css/width_nonreplaced_block_simple_a.html": [
+ {
+ "path": "css/width_nonreplaced_block_simple_a.html",
+ "references": [
+ [
+ "/_mozilla/css/width_nonreplaced_block_simple_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/width_nonreplaced_block_simple_a.html"
+ }
+ ],
"css/word-spacing.html": [
{
"path": "css/word-spacing.html",
diff --git a/tests/ref/width_nonreplaced_block_simple_a.html b/tests/wpt/mozilla/tests/css/width_nonreplaced_block_simple_a.html
similarity index 83%
rename from tests/ref/width_nonreplaced_block_simple_a.html
rename to tests/wpt/mozilla/tests/css/width_nonreplaced_block_simple_a.html
index f06f040946e..cf91a08c526 100644
--- a/tests/ref/width_nonreplaced_block_simple_a.html
+++ b/tests/wpt/mozilla/tests/css/width_nonreplaced_block_simple_a.html
@@ -1,5 +1,6 @@
+