diff --git a/moli-renderer-v8/src/context_bootstrap/events.rs b/moli-renderer-v8/src/context_bootstrap/events.rs
index fa835d22e1..24359cbc18 100644
--- a/moli-renderer-v8/src/context_bootstrap/events.rs
+++ b/moli-renderer-v8/src/context_bootstrap/events.rs
@@ -317,7 +317,7 @@ pub(super) use base::{
     event_target_getter_function, event_type_getter_function, set_event_dispatch_fields,
     set_event_initialized,
 };
-pub(in crate::context_bootstrap) use init::EventInit;
+pub(in crate::context_bootstrap) use init::{EventInit, parse_event_dictionary};
 pub(super) use kind::EventSubclassKind;
 pub(super) use methods::{
     event_cancel_bubble_getter_function, event_cancel_bubble_setter_function,
diff --git a/moli-renderer-v8/src/context_bootstrap/events/init.rs b/moli-renderer-v8/src/context_bootstrap/events/init.rs
index 8e698afebb..862fcb2a99 100644
--- a/moli-renderer-v8/src/context_bootstrap/events/init.rs
+++ b/moli-renderer-v8/src/context_bootstrap/events/init.rs
@@ -14,6 +14,25 @@ pub(in crate::context_bootstrap) struct EventInit {
     pub(in crate::context_bootstrap) composed: bool,
 }
 
+pub(in crate::context_bootstrap) fn parse_event_dictionary<'s, T: webidl::WebIdlDictionary<'s>>(
+    scope: &mut v8::PinScope<'s, '_>,
+    args: &v8::FunctionCallbackArguments<'s>,
+    constructor: &'static str,
+) -> Option<T> {
+    let parsed = webidl::convert::<webidl::Dictionary<T>>(
+        scope,
+        args.get(1),
+        webidl::Context::argument(constructor, 2),
+    );
+    match parsed {
+        Ok(init) => Some(init.0),
+        Err(error) => {
+            webidl::throw_error(scope, &error);
+            None
+        }
+    }
+}
+
 pub(super) fn init_bool_property<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     init: Option<v8::Local<'s, v8::Object>>,
diff --git a/moli-renderer-v8/src/context_bootstrap/events/message.rs b/moli-renderer-v8/src/context_bootstrap/events/message.rs
index 80f4881960..9a99f64fc1 100644
--- a/moli-renderer-v8/src/context_bootstrap/events/message.rs
+++ b/moli-renderer-v8/src/context_bootstrap/events/message.rs
@@ -50,25 +50,7 @@ pub(super) fn parse_message_event_init<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: &v8::FunctionCallbackArguments<'s>,
 ) -> Option<MessageEventInit<'s>> {
-    let parsed = webidl::dictionary_arg(args, 1, webidl::Context::argument("MessageEvent", 2))
-        .and_then(|object| match object {
-            Some(object) => webidl::parse_dictionary_object(scope, object),
-            None => Ok(MessageEventInit {
-                base: EventInit::default(),
-                data: None,
-                last_event_id: webidl::DomString16(Vec::new()),
-                origin: String::new(),
-                ports: Vec::new(),
-                source: None,
-            }),
-        });
-    match parsed {
-        Ok(init) => Some(init),
-        Err(error) => {
-            webidl::throw_error(scope, &error);
-            None
-        }
-    }
+    crate::context_bootstrap::events::parse_event_dictionary(scope, args, "MessageEvent")
 }
 
 #[derive(webidl::WebIdlArgs)]
diff --git a/moli-renderer-v8/src/context_bootstrap/events/subclasses/data.rs b/moli-renderer-v8/src/context_bootstrap/events/subclasses/data.rs
index 73d82a4dc6..3a2a5cc497 100644
--- a/moli-renderer-v8/src/context_bootstrap/events/subclasses/data.rs
+++ b/moli-renderer-v8/src/context_bootstrap/events/subclasses/data.rs
@@ -290,18 +290,7 @@ pub(super) fn parse_storage_event_init<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: &v8::FunctionCallbackArguments<'s>,
 ) -> Option<StorageEventInitMembers<'s>> {
-    let parsed = webidl::dictionary_arg(args, 1, webidl::Context::argument("StorageEvent", 2))
-        .and_then(|object| match object {
-            Some(object) => webidl::parse_dictionary_object(scope, object),
-            None => Ok(StorageEventInitMembers::default()),
-        });
-    match parsed {
-        Ok(init) => Some(init),
-        Err(error) => {
-            webidl::throw_error(scope, &error);
-            None
-        }
-    }
+    crate::context_bootstrap::events::parse_event_dictionary(scope, args, "StorageEvent")
 }
 
 pub(in crate::context_bootstrap::events::subclasses) fn initialize_drag_event<'s>(
diff --git a/moli-renderer-v8/src/context_bootstrap/events/subclasses/error.rs b/moli-renderer-v8/src/context_bootstrap/events/subclasses/error.rs
index 70a1dc363c..4cbedfa62f 100644
--- a/moli-renderer-v8/src/context_bootstrap/events/subclasses/error.rs
+++ b/moli-renderer-v8/src/context_bootstrap/events/subclasses/error.rs
@@ -22,35 +22,11 @@ pub(super) struct ErrorEventInit<'s> {
     message: webidl::DomString16,
 }
 
-impl Default for ErrorEventInit<'_> {
-    fn default() -> Self {
-        Self {
-            base: EventInit::default(),
-            colno: 0,
-            error: None,
-            filename: String::new(),
-            lineno: 0,
-            message: webidl::DomString16(Vec::new()),
-        }
-    }
-}
-
 pub(super) fn parse_error_event_init<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: &v8::FunctionCallbackArguments<'s>,
 ) -> Option<ErrorEventInit<'s>> {
-    let parsed = webidl::dictionary_arg(args, 1, webidl::Context::argument("ErrorEvent", 2))
-        .and_then(|object| match object {
-            Some(object) => webidl::parse_dictionary_object(scope, object),
-            None => Ok(ErrorEventInit::default()),
-        });
-    match parsed {
-        Ok(init) => Some(init),
-        Err(error) => {
-            webidl::throw_error(scope, &error);
-            None
-        }
-    }
+    crate::context_bootstrap::events::parse_event_dictionary(scope, args, "ErrorEvent")
 }
 
 impl<'s> ErrorEventInit<'s> {