servo · bors-servo · Oct 29, 2019 · Oct 28, 2019
diff --git a/components/script/dom/mouseevent.rs b/components/script/dom/mouseevent.rs
@@ -137,7 +137,7 @@ impl MouseEvent {
             init.parent.shiftKey,
             init.parent.metaKey,
             init.button,
-            0,
+            init.buttons,
             init.relatedTarget.as_deref(),
             None,
         );

diff --git a/tests/wpt/metadata/dom/events/Event-subclasses-constructors.html.ini b/tests/wpt/metadata/dom/events/Event-subclasses-constructors.html.ini
@@ -1,8 +1,5 @@
 [Event-subclasses-constructors.html]
   type: testharness
-  [MouseEvent constructor (argument with non-default values)]
-    expected: FAIL
-
   [WheelEvent constructor (argument with non-default values)]
     expected: FAIL