diff --git a/components/style/properties/shorthands/list.mako.rs b/components/style/properties/shorthands/list.mako.rs
index 10a43f83f4c..183c5ab5daa 100644
--- a/components/style/properties/shorthands/list.mako.rs
+++ b/components/style/properties/shorthands/list.mako.rs
@@ -113,14 +113,14 @@
             #[cfg(feature = "gecko")]
             let position_is_initial = self.list_style_position == &ListStylePosition::Outside;
             #[cfg(feature = "servo")]
-            let position_is_initial = self.list_style_position == Some(&ListStylePosition::Outside);
+            let position_is_initial = matches!(self.list_style_position, None | Some(&ListStylePosition::Outside));
             if !position_is_initial {
                 self.list_style_position.to_css(dest)?;
                 have_one_non_initial_value = true;
             }
             if self.list_style_image != &ListStyleImage::None {
                 if have_one_non_initial_value {
-                   dest.write_char(' ')?;
+                    dest.write_char(' ')?;
                 }
                 self.list_style_image.to_css(dest)?;
                 have_one_non_initial_value = true;
@@ -137,7 +137,14 @@
                 have_one_non_initial_value = true;
             }
             if !have_one_non_initial_value {
+                #[cfg(feature = "gecko")]
                 self.list_style_position.to_css(dest)?;
+                #[cfg(feature = "servo")]
+                if let Some(position) = self.list_style_position {
+                    position.to_css(dest)?;
+                } else {
+                    self.list_style_type.to_css(dest)?;
+                }
             }
             Ok(())
         }
diff --git a/tests/wpt/meta/css/cssom/cssom-getPropertyValue-common-checks.html.ini b/tests/wpt/meta/css/cssom/cssom-getPropertyValue-common-checks.html.ini
deleted file mode 100644
index 50c8b190095..00000000000
--- a/tests/wpt/meta/css/cssom/cssom-getPropertyValue-common-checks.html.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[cssom-getPropertyValue-common-checks.html]
-  [All properties (except 'all') can serialize their initial value (computed)]
-    expected: FAIL
-
-  [All shorthands (except 'all') can serialize their longhands set to their initial value]
-    expected: FAIL