3 files changed, 81 insertions, 2 deletions
diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index 27f68a312e4..54f517ab1a3 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -4694,7 +4694,6 @@ class CGDictionary(CGThing):
                                          descriptorProvider,
                                          isMember="Dictionary",
                                          defaultValue=member.defaultValue,
-                                         failureCode="return Err(());",
                                          exceptionCode="return Err(());"))
             for member in dictionary.members]
 
diff --git a/tests/wpt/metadata/DOMEvents/constructors.html.ini b/tests/wpt/metadata/DOMEvents/constructors.html.ini
index c184b4a6143..b0a20934357 100644
--- a/tests/wpt/metadata/DOMEvents/constructors.html.ini
+++ b/tests/wpt/metadata/DOMEvents/constructors.html.ini
@@ -1,3 +1,77 @@
 [constructors.html]
   type: testharness
-  disabled: issue 5340
+  [FocusEvent constructor (no argument)]
+    expected: FAIL
+
+  [FocusEvent constructor (undefined argument)]
+    expected: FAIL
+
+  [FocusEvent constructor (null argument)]
+    expected: FAIL
+
+  [FocusEvent constructor (empty argument)]
+    expected: FAIL
+
+  [FocusEvent constructor (argument with default values)]
+    expected: FAIL
+
+  [FocusEvent constructor (argument with non-default values)]
+    expected: FAIL
+
+  [MouseEvent constructor (no argument)]
+    expected: FAIL
+
+  [MouseEvent constructor (undefined argument)]
+    expected: FAIL
+
+  [MouseEvent constructor (null argument)]
+    expected: FAIL
+
+  [MouseEvent constructor (empty argument)]
+    expected: FAIL
+
+  [MouseEvent constructor (argument with default values)]
+    expected: FAIL
+
+  [MouseEvent constructor (argument with non-default values)]
+    expected: FAIL
+
+  [WheelEvent constructor (no argument)]
+    expected: FAIL
+
+  [WheelEvent constructor (undefined argument)]
+    expected: FAIL
+
+  [WheelEvent constructor (null argument)]
+    expected: FAIL
+
+  [WheelEvent constructor (empty argument)]
+    expected: FAIL
+
+  [WheelEvent constructor (argument with default values)]
+    expected: FAIL
+
+  [WheelEvent constructor (argument with non-default values)]
+    expected: FAIL
+
+  [KeyboardEvent constructor (argument with non-default values)]
+    expected: FAIL
+
+  [CompositionEvent constructor (no argument)]
+    expected: FAIL
+
+  [CompositionEvent constructor (undefined argument)]
+    expected: FAIL
+
+  [CompositionEvent constructor (null argument)]
+    expected: FAIL
+
+  [CompositionEvent constructor (empty argument)]
+    expected: FAIL
+
+  [CompositionEvent constructor (argument with default values)]
+    expected: FAIL
+
+  [CompositionEvent constructor (argument with non-default values)]
+    expected: FAIL
+
diff --git a/tests/wpt/web-platform-tests/DOMEvents/constructors.html b/tests/wpt/web-platform-tests/DOMEvents/constructors.html
index b41d1d7bd0c..1741b960025 100644
--- a/tests/wpt/web-platform-tests/DOMEvents/constructors.html
+++ b/tests/wpt/web-platform-tests/DOMEvents/constructors.html
@@ -144,4 +144,10 @@ Object.keys(expected).forEach(function(iface) {
     assert_props(iface, event, false);
   }, iface + " constructor (argument with non-default values)");
 });
+
+test(function () {
+  assert_throws(new TypeError(), function() {
+    new UIEvent("x", { view: 7 })
+  });
+}, "UIEvent constructor (view argument with wrong type)")
 </script>