diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index fb73d0febe5e8..1c510cb6c89b7 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -3573924,7 +3573924,7 @@ html
 :
 [
 "
-48ca70f4c20da103276e1b053ca0e4613fcc2819
+85952fbd040de03f5082f28ba8116fd4827a1fc3
 "
 "
 testharness
@@ -3574168,7 +3574168,7 @@ html
 :
 [
 "
-8bfc0dff5da1859e17df31ceeca710d17a982109
+9211674fd69ddfa32d3bafcf2bc967977eb3ec31
 "
 "
 testharness
diff --git a/testing/web-platform/tests/css/cssom/overflow-serialization.html b/testing/web-platform/tests/css/cssom/overflow-serialization.html
index 0defe6e0e48a6..bdf9fc1d5f1a5 100644
--- a/testing/web-platform/tests/css/cssom/overflow-serialization.html
+++ b/testing/web-platform/tests/css/cssom/overflow-serialization.html
@@ -24,15 +24,9 @@
 >
 CSSOM
 -
-Overlow
-property
-has
-different
+Overflow
+shorthand
 serialization
-than
-other
-shorthands
-.
 <
 /
 title
@@ -156,13 +150,13 @@
 -
 x
 :
-inherit
+scroll
 ;
 overflow
 -
 y
 :
-unset
+hidden
 ;
 }
 <
@@ -350,16 +344,9 @@
 cssText
 "
 overflow
--
-x
-:
-inherit
-;
-overflow
--
-y
 :
-unset
+scroll
+hidden
 ;
 "
 "
@@ -583,7 +570,7 @@
 overflowX
 =
 "
-inherit
+scroll
 "
 ;
 div
@@ -593,7 +580,7 @@
 overflowY
 =
 "
-unset
+hidden
 "
 ;
 assert_equals
@@ -604,6 +591,8 @@
 .
 overflow
 "
+scroll
+hidden
 "
 "
 Overflow
@@ -615,10 +604,9 @@
 with
 different
 keywords
-shouldn
-'
-t
+should
 serialize
+correctly
 .
 "
 )
diff --git a/testing/web-platform/tests/css/cssom/shorthand-values.html b/testing/web-platform/tests/css/cssom/shorthand-values.html
index c7c9feea67283..b567c265a2a93 100644
--- a/testing/web-platform/tests/css/cssom/shorthand-values.html
+++ b/testing/web-platform/tests/css/cssom/shorthand-values.html
@@ -525,15 +525,8 @@
 :
 '
 overflow
--
-x
 :
 scroll
-;
-overflow
--
-y
-:
 hidden
 ;
 '