diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index 08a7595105b..3b92e207129 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -378,10 +378,13 @@ impl ${style_struct.gecko_struct_name} {
     }
 </%def>
 
-<%def name="impl_simple_copy(ident, gecko_ffi_name, *kwargs)">
+<%def name="impl_simple_copy(ident, gecko_ffi_name, on_set=None, *kwargs)">
     #[allow(non_snake_case)]
     pub fn copy_${ident}_from(&mut self, other: &Self) {
         self.gecko.${gecko_ffi_name} = other.gecko.${gecko_ffi_name};
+        % if on_set:
+        self.${on_set}();
+        % endif
     }
 </%def>
 
@@ -478,7 +481,7 @@ def set_gecko_property(ffi_name, expr):
 
 <%def name="impl_keyword(ident, gecko_ffi_name, keyword, need_clone, cast_type='u8', **kwargs)">
 <%call expr="impl_keyword_setter(ident, gecko_ffi_name, keyword, cast_type, **kwargs)"></%call>
-<%call expr="impl_simple_copy(ident, gecko_ffi_name)"></%call>
+<%call expr="impl_simple_copy(ident, gecko_ffi_name, **kwargs)"></%call>
 %if need_clone:
 <%call expr="impl_keyword_clone(ident, gecko_ffi_name, keyword, cast_type)"></%call>
 % endif