diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 2b919662b54..fdd53a653ab 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -11,8 +11,5 @@ resolution=800x600 == viewport_percentage_vmin_vmax.html viewport_percentage_vmi
resolution=800x600 == viewport_percentage_vw_vh.html viewport_percentage_vw_vh_a.html
# resolution=600x800 == viewport_percentage_vw_vh.html viewport_percentage_vw_vh_b.html
-flaky_macos == white_space_intrinsic_sizes_a.html white_space_intrinsic_sizes_ref.html
-
-
# This file must be sorted alphabetically.
# Please run `./mach test-tidy` to check your changes.
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 153acb28867..cfa25fec76d 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -4915,6 +4915,18 @@
"url": "/_mozilla/css/white-space-pre-wrap.htm"
}
],
+ "css/white_space_intrinsic_sizes_a.html": [
+ {
+ "path": "css/white_space_intrinsic_sizes_a.html",
+ "references": [
+ [
+ "/_mozilla/css/white_space_intrinsic_sizes_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/white_space_intrinsic_sizes_a.html"
+ }
+ ],
"css/whitespace_nowrap_a.html": [
{
"path": "css/whitespace_nowrap_a.html",
@@ -10770,6 +10782,18 @@
"url": "/_mozilla/css/white-space-pre-wrap.htm"
}
],
+ "css/white_space_intrinsic_sizes_a.html": [
+ {
+ "path": "css/white_space_intrinsic_sizes_a.html",
+ "references": [
+ [
+ "/_mozilla/css/white_space_intrinsic_sizes_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/white_space_intrinsic_sizes_a.html"
+ }
+ ],
"css/whitespace_nowrap_a.html": [
{
"path": "css/whitespace_nowrap_a.html",
diff --git a/tests/wpt/mozilla/meta/css/white_space_intrinsic_sizes_a.html.ini b/tests/wpt/mozilla/meta/css/white_space_intrinsic_sizes_a.html.ini
new file mode 100644
index 00000000000..5e63331f2f8
--- /dev/null
+++ b/tests/wpt/mozilla/meta/css/white_space_intrinsic_sizes_a.html.ini
@@ -0,0 +1,5 @@
+[white_space_intrinsic_sizes_a.html]
+ type: reftest
+ expected:
+ if os == "mac": FAIL
+ bug: https://github.com/servo/servo/issues/3926
diff --git a/tests/ref/white_space_intrinsic_sizes_a.html b/tests/wpt/mozilla/tests/css/white_space_intrinsic_sizes_a.html
similarity index 93%
rename from tests/ref/white_space_intrinsic_sizes_a.html
rename to tests/wpt/mozilla/tests/css/white_space_intrinsic_sizes_a.html
index 87944c21b5c..66d7a80ce37 100644
--- a/tests/ref/white_space_intrinsic_sizes_a.html
+++ b/tests/wpt/mozilla/tests/css/white_space_intrinsic_sizes_a.html
@@ -1,6 +1,7 @@
+