diff --git a/moli-renderer-v8/src/context_bootstrap/constructors/custom_elements_registry.rs b/moli-renderer-v8/src/context_bootstrap/constructors/custom_elements_registry.rs
index cabbb60886..b9a174b2c1 100644
--- a/moli-renderer-v8/src/context_bootstrap/constructors/custom_elements_registry.rs
+++ b/moli-renderer-v8/src/context_bootstrap/constructors/custom_elements_registry.rs
@@ -1,7 +1,6 @@
 use super::*;
 use crate::web_api_interfaces;
 use crate::webidl;
-use anyhow::Result;
 use moli_webapi_declare::WebApiFunctionTemplate;
 
 #[derive(WebApiFunctionTemplate)]
@@ -49,7 +48,7 @@ struct CustomElementsDefineArgs<'s> {
         missing_message = "customElements.define(name, constructor) requires a constructor function"
     )]
     constructor: v8::Local<'s, v8::Function>,
-    #[webidl(with = parse_element_definition_options_arg)]
+    #[webidl(dictionary)]
     options: ElementDefinitionOptions,
 }
 
@@ -225,18 +224,6 @@ pub(in crate::context_bootstrap) fn custom_elements_define_callback<'s>(
     }
 }
 
-fn parse_element_definition_options_arg<'s>(
-    scope: &mut v8::PinScope<'s, '_>,
-    args: &v8::FunctionCallbackArguments<'s>,
-    index: i32,
-) -> Result<ElementDefinitionOptions, webidl::WebIdlError> {
-    let context = webidl::Context::argument("CustomElementRegistry.define", (index + 1) as usize);
-    webidl::dictionary_arg(args, index, context)?
-        .map(|object| webidl::parse_dictionary_object::<ElementDefinitionOptions>(scope, object))
-        .transpose()
-        .map(|options| options.unwrap_or_default())
-}
-
 pub(in crate::context_bootstrap) fn custom_elements_get_callback<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: v8::FunctionCallbackArguments<'s>,
diff --git a/moli-renderer-v8/src/context_bootstrap/constructors/dom_exception.rs b/moli-renderer-v8/src/context_bootstrap/constructors/dom_exception.rs
index fe481fec7a..e594c9b9ee 100644
--- a/moli-renderer-v8/src/context_bootstrap/constructors/dom_exception.rs
+++ b/moli-renderer-v8/src/context_bootstrap/constructors/dom_exception.rs
@@ -46,7 +46,7 @@ struct QuotaExceededErrorOptions {
 struct QuotaExceededErrorConstructorArgs {
     #[webidl(default = "")]
     message: String,
-    #[webidl(default = QuotaExceededErrorOptions::default(), with = quota_exceeded_error_options_arg)]
+    #[webidl(dictionary)]
     options: QuotaExceededErrorOptions,
 }
 
@@ -636,20 +636,6 @@ pub(crate) fn new_dom_error_value<'s>(
         .into()
 }
 
-fn quota_exceeded_error_options_arg<'s>(
-    scope: &mut v8::PinScope<'s, '_>,
-    args: &v8::FunctionCallbackArguments<'s>,
-    index: i32,
-) -> Result<QuotaExceededErrorOptions, webidl::WebIdlError> {
-    let context = webidl::Context::argument("QuotaExceededError", (index + 1) as usize);
-    if args.length() <= index {
-        return Ok(QuotaExceededErrorOptions::default());
-    }
-    let value = args.get(index);
-    webidl::parse_dictionary::<QuotaExceededErrorOptions>(scope, value, context)
-        .map(|value| value.unwrap_or_default())
-}
-
 pub(crate) fn quota_exceeded_error_constructor_callback<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: v8::FunctionCallbackArguments<'s>,
diff --git a/moli-renderer-v8/src/context_bootstrap/constructors/text_codecs.rs b/moli-renderer-v8/src/context_bootstrap/constructors/text_codecs.rs
index ad9fa402a2..8a51dceed3 100644
--- a/moli-renderer-v8/src/context_bootstrap/constructors/text_codecs.rs
+++ b/moli-renderer-v8/src/context_bootstrap/constructors/text_codecs.rs
@@ -109,7 +109,7 @@ struct TextEncoderEncodeIntoArgs<'s> {
 struct TextDecoderConstructorArgs {
     #[webidl(default = "utf-8")]
     label: String,
-    #[webidl(index = 1, with = parse_text_decoder_options_arg)]
+    #[webidl(index = 1, dictionary)]
     options: TextDecoderOptions,
 }
 
@@ -127,7 +127,7 @@ struct TextDecoderOptions {
 struct TextDecoderDecodeArgs {
     #[webidl(converter = "buffer_source")]
     input: Option<webidl::BufferSource>,
-    #[webidl(index = 1, with = parse_text_decode_options_arg)]
+    #[webidl(index = 1, dictionary)]
     options: TextDecodeOptions,
 }
 
@@ -338,30 +338,6 @@ pub(in crate::context_bootstrap) fn text_decoder_constructor_callback<'s>(
     rv.set(args.this().into());
 }
 
-fn parse_text_decoder_options_arg<'s>(
-    scope: &mut v8::PinScope<'s, '_>,
-    args: &v8::FunctionCallbackArguments<'s>,
-    index: i32,
-) -> Result<TextDecoderOptions, webidl::WebIdlError> {
-    let context = webidl::Context::argument("TextDecoder", (index + 1) as usize);
-    webidl::dictionary_arg(args, index, context)?
-        .map(|object| webidl::parse_dictionary_object(scope, object))
-        .transpose()
-        .map(|options| options.unwrap_or_default())
-}
-
-fn parse_text_decode_options_arg<'s>(
-    scope: &mut v8::PinScope<'s, '_>,
-    args: &v8::FunctionCallbackArguments<'s>,
-    index: i32,
-) -> Result<TextDecodeOptions, webidl::WebIdlError> {
-    let context = webidl::Context::argument("TextDecoder.decode", (index + 1) as usize);
-    webidl::dictionary_arg(args, index, context)?
-        .map(|object| webidl::parse_dictionary_object(scope, object))
-        .transpose()
-        .map(|options| options.unwrap_or_default())
-}
-
 fn text_decoder_decode_callback<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: v8::FunctionCallbackArguments<'s>,
diff --git a/moli-renderer-v8/src/context_bootstrap/navigator_runtime/geolocation.rs b/moli-renderer-v8/src/context_bootstrap/navigator_runtime/geolocation.rs
index 8fdc662a43..3db26ffe70 100644
--- a/moli-renderer-v8/src/context_bootstrap/navigator_runtime/geolocation.rs
+++ b/moli-renderer-v8/src/context_bootstrap/navigator_runtime/geolocation.rs
@@ -88,7 +88,7 @@ struct GetCurrentPositionArgs {
     #[webidl(nullable, converter = "callback_function")]
     error_callback: Option<webidl::WebIdlCallbackFunction>,
 
-    #[webidl(with = position_options_arg)]
+    #[webidl(dictionary)]
     options: PositionOptions,
 }
 
@@ -101,7 +101,7 @@ struct WatchPositionArgs {
     #[webidl(nullable, converter = "callback_function")]
     error_callback: Option<webidl::WebIdlCallbackFunction>,
 
-    #[webidl(with = position_options_arg)]
+    #[webidl(dictionary)]
     options: PositionOptions,
 }
 
@@ -248,30 +248,6 @@ fn geolocation_clear_watch_callback<'s>(
     rv.set_undefined();
 }
 
-fn position_options_arg<'s>(
-    scope: &mut v8::PinScope<'s, '_>,
-    args: &v8::FunctionCallbackArguments<'s>,
-    index: i32,
-) -> std::result::Result<PositionOptions, webidl::WebIdlError> {
-    if args.length() <= index || args.get(index).is_undefined() {
-        return Ok(PositionOptions {
-            timeout: u32::MAX,
-            ..PositionOptions::default()
-        });
-    }
-    webidl::parse_dictionary::<PositionOptions>(
-        scope,
-        args.get(index),
-        webidl::Context::argument("Geolocation", (index + 1) as usize),
-    )
-    .map(|options| {
-        options.unwrap_or(PositionOptions {
-            timeout: u32::MAX,
-            ..PositionOptions::default()
-        })
-    })
-}
-
 fn clamped_unsigned_long_position_option<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     object: v8::Local<'s, v8::Object>,
diff --git a/moli-renderer-v8/src/context_bootstrap/web_audio_runtime.rs b/moli-renderer-v8/src/context_bootstrap/web_audio_runtime.rs
index 234df22f28..0175beedce 100644
--- a/moli-renderer-v8/src/context_bootstrap/web_audio_runtime.rs
+++ b/moli-renderer-v8/src/context_bootstrap/web_audio_runtime.rs
@@ -685,23 +685,10 @@ struct WorkletOptions {
 struct WorkletAddModuleArgs {
     #[webidl(required, converter = "usv_string")]
     module_url: String,
-    #[webidl(with = worklet_options_arg)]
+    #[webidl(dictionary)]
     options: WorkletOptions,
 }
 
-fn worklet_options_arg<'s>(
-    scope: &mut v8::PinScope<'s, '_>,
-    args: &v8::FunctionCallbackArguments<'s>,
-    index: i32,
-) -> Result<WorkletOptions, webidl::WebIdlError> {
-    webidl::parse_dictionary(
-        scope,
-        args.get(index),
-        webidl::Context::argument("Worklet.addModule", 2),
-    )
-    .map(Option::unwrap_or_default)
-}
-
 fn audio_worklet_add_module_callback<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: v8::FunctionCallbackArguments<'s>,
diff --git a/moli-renderer-v8/src/network_host/xhr/bindings/progress_event.rs b/moli-renderer-v8/src/network_host/xhr/bindings/progress_event.rs
index 0b7ff0267d..d5f2ed7ccb 100644
--- a/moli-renderer-v8/src/network_host/xhr/bindings/progress_event.rs
+++ b/moli-renderer-v8/src/network_host/xhr/bindings/progress_event.rs
@@ -41,24 +41,10 @@ struct ProgressEventConstructorArgs {
         missing_message = "Failed to construct 'ProgressEvent': 1 argument required, but only 0 present."
     )]
     event_type: String,
-    #[webidl(default = ProgressEventInitArgs::default(), with = progress_event_init_arg)]
+    #[webidl(dictionary)]
     init: ProgressEventInitArgs,
 }
 
-fn progress_event_init_arg<'s>(
-    scope: &mut v8::PinScope<'s, '_>,
-    args: &v8::FunctionCallbackArguments<'s>,
-    index: i32,
-) -> Result<ProgressEventInitArgs, webidl::WebIdlError> {
-    let context = webidl::Context::argument("ProgressEvent", (index + 1) as usize);
-    if args.length() <= index {
-        return Ok(ProgressEventInitArgs::default());
-    }
-    let value = args.get(index);
-    webidl::parse_dictionary::<ProgressEventInitArgs>(scope, value, context)
-        .map(|value| value.unwrap_or_default())
-}
-
 pub(crate) fn progress_event_constructor_callback<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: v8::FunctionCallbackArguments<'s>,