diff --git a/moli-benchmark/wpt-cross-current/failed-cases.txt b/moli-benchmark/wpt-cross-current/failed-cases.txt
index 0290ef22ef..429c2fec05 100644
--- a/moli-benchmark/wpt-cross-current/failed-cases.txt
+++ b/moli-benchmark/wpt-cross-current/failed-cases.txt
@@ -3155,7 +3155,6 @@ html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-ine
 html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-prevent-autofocus.html
 html/semantics/interactive-elements/the-dialog-element/dialog-inert.html
 html/semantics/interactive-elements/the-dialog-element/dialog-overlay.html
-html/semantics/interactive-elements/the-dialog-element/dialog-requestclose-recurse.html
 html/semantics/interactive-elements/the-dialog-element/dialog-showModal.html
 html/semantics/interactive-elements/the-dialog-element/inertness-with-modal-dialogs-and-iframes.html
 html/semantics/interactive-elements/the-dialog-element/modal-dialog-in-visibility-hidden.html
diff --git a/moli-benchmark/wpt-cross-current/passed-cases.txt b/moli-benchmark/wpt-cross-current/passed-cases.txt
index b2f085a8e9..567bcf09c9 100644
--- a/moli-benchmark/wpt-cross-current/passed-cases.txt
+++ b/moli-benchmark/wpt-cross-current/passed-cases.txt
@@ -5951,6 +5951,7 @@ html/semantics/interactive-elements/the-dialog-element/dialog-form-submission-un
 html/semantics/interactive-elements/the-dialog-element/dialog-no-throw-requested-state.html
 html/semantics/interactive-elements/the-dialog-element/dialog-open-2.html
 html/semantics/interactive-elements/the-dialog-element/dialog-open.html
+html/semantics/interactive-elements/the-dialog-element/dialog-requestclose-recurse.html
 html/semantics/interactive-elements/the-dialog-element/dialog-return-value.html
 html/semantics/interactive-elements/the-dialog-element/dialog-showModal-remove.html
 html/semantics/interactive-elements/the-dialog-element/form-submit-dialog-shadow.html
diff --git a/moli-renderer-v8/src/native_bridge/context_host/core.rs b/moli-renderer-v8/src/native_bridge/context_host/core.rs
index f92a1e7ff8..5640993d84 100644
--- a/moli-renderer-v8/src/native_bridge/context_host/core.rs
+++ b/moli-renderer-v8/src/native_bridge/context_host/core.rs
@@ -387,6 +387,7 @@ impl JsContextHost {
             button_element_targets: HashMap::new(),
             constructing_form_data_forms: Vec::new(),
             active_form_submission_forms: Vec::new(),
+            active_dialog_request_closes: HashSet::new(),
             pending_form_submission_child_targets: HashMap::new(),
             active_image_submitter_coordinate: None,
             current_inline_script_stack: Vec::new(),
@@ -1704,6 +1705,14 @@ impl JsContextHost {
         }
     }
 
+    pub(crate) fn begin_dialog_request_close(&mut self, dialog: DomHandle) -> bool {
+        self.active_dialog_request_closes.insert(dialog)
+    }
+
+    pub(crate) fn end_dialog_request_close(&mut self, dialog: DomHandle) {
+        self.active_dialog_request_closes.remove(&dialog);
+    }
+
     pub(crate) fn observers_mut(
         &mut self,
         _access: &ObserverStoreAccessToken,
diff --git a/moli-renderer-v8/src/native_bridge/context_host/mod.rs b/moli-renderer-v8/src/native_bridge/context_host/mod.rs
index f5faf452a3..570ae4651a 100644
--- a/moli-renderer-v8/src/native_bridge/context_host/mod.rs
+++ b/moli-renderer-v8/src/native_bridge/context_host/mod.rs
@@ -993,6 +993,7 @@ pub(crate) struct JsContextHost {
     button_element_targets: HashMap<(DomHandle, String), DomHandle>,
     constructing_form_data_forms: Vec<DomHandle>,
     active_form_submission_forms: Vec<DomHandle>,
+    active_dialog_request_closes: HashSet<DomHandle>,
     pending_form_submission_child_targets: HashMap<DomHandle, Vec<DomHandle>>,
     active_image_submitter_coordinate: Option<(DomHandle, u32, u32)>,
     current_inline_script_stack: Vec<DomHandle>,
diff --git a/moli-renderer-v8/src/native_bridge/element.rs b/moli-renderer-v8/src/native_bridge/element.rs
index 3a7eba9e4b..4a3c850205 100644
--- a/moli-renderer-v8/src/native_bridge/element.rs
+++ b/moli-renderer-v8/src/native_bridge/element.rs
@@ -178,8 +178,9 @@ pub(super) use dataset::{build_dom_string_map_wrapper_template, node_dataset_get
 use details_dialog::{
     close_dialog_element, details_open_getter_function, details_open_setter_function,
     dialog_close_callback, dialog_open_getter_function, dialog_open_setter_function,
-    dialog_return_value_getter_function, dialog_return_value_setter_function, dialog_show_callback,
-    dialog_show_modal_callback, perform_summary_click_default_action,
+    dialog_request_close_callback, dialog_return_value_getter_function,
+    dialog_return_value_setter_function, dialog_show_callback, dialog_show_modal_callback,
+    perform_summary_click_default_action,
 };
 pub(crate) use details_dialog::{
     queue_details_toggle_event_for_attribute_change, queue_parser_details_toggle_event,
@@ -4378,6 +4379,8 @@ struct HtmlDialogElementPrototypeDeclaration {
     show_modal: (),
     #[webapi(method, length = 1, callback = dialog_close_callback)]
     close: (),
+    #[webapi(method, length = 1, callback = dialog_request_close_callback)]
+    request_close: (),
 }
 
 #[derive(WebApiFunctionTemplate)]
diff --git a/moli-renderer-v8/src/native_bridge/element/details_dialog.rs b/moli-renderer-v8/src/native_bridge/element/details_dialog.rs
index e4cbe3cb57..93503994bd 100644
--- a/moli-renderer-v8/src/native_bridge/element/details_dialog.rs
+++ b/moli-renderer-v8/src/native_bridge/element/details_dialog.rs
@@ -16,8 +16,9 @@ use super::super::{
 use super::popover::popover_is_open;
 use super::toggle_event::queue_element_toggle_event;
 use super::{
-    dispatch_public_event, element_has_attribute, html_element_getter_receiver,
-    html_element_setter_receiver, property_dom_string_value, set_reflected_boolean_attribute,
+    construct_simple_event, dispatch_public_event, element_has_attribute,
+    html_element_getter_receiver, html_element_setter_receiver, property_dom_string_value,
+    set_reflected_boolean_attribute,
 };
 
 pub(crate) fn queue_details_toggle_event_for_attribute_change(
@@ -101,6 +102,13 @@ struct DialogCloseArgs {
     return_value: Option<String>,
 }
 
+#[derive(webidl::WebIdlArgs)]
+#[webidl(prefix = "HTMLDialogElement.requestClose")]
+struct DialogRequestCloseArgs {
+    #[webidl(with = dialog_request_close_return_value_arg)]
+    return_value: Option<String>,
+}
+
 pub(super) fn main_summary_child(runtime: &JsContextHost, details: DomHandle) -> Option<DomHandle> {
     let details_element = runtime
         .dom_host()
@@ -180,17 +188,29 @@ fn dialog_close_return_value_arg<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     args: &v8::FunctionCallbackArguments<'s>,
     index: i32,
+) -> Result<Option<String>, webidl::WebIdlError> {
+    dialog_optional_return_value_arg(scope, args, index, "HTMLDialogElement.close")
+}
+
+fn dialog_request_close_return_value_arg<'s>(
+    scope: &mut v8::PinScope<'s, '_>,
+    args: &v8::FunctionCallbackArguments<'s>,
+    index: i32,
+) -> Result<Option<String>, webidl::WebIdlError> {
+    dialog_optional_return_value_arg(scope, args, index, "HTMLDialogElement.requestClose")
+}
+
+fn dialog_optional_return_value_arg<'s>(
+    scope: &mut v8::PinScope<'s, '_>,
+    args: &v8::FunctionCallbackArguments<'s>,
+    index: i32,
+    prefix: &'static str,
 ) -> Result<Option<String>, webidl::WebIdlError> {
     if args.length() <= index || args.get(index).is_undefined() {
         return Ok(None);
     }
-    webidl::argument::<webidl::DomString>(
-        scope,
-        args,
-        index,
-        webidl::Context::argument("HTMLDialogElement.close", 1),
-    )
-    .map(|value| Some(value.0))
+    webidl::argument::<webidl::DomString>(scope, args, index, webidl::Context::argument(prefix, 1))
+        .map(|value| Some(value.0))
 }
 
 fn dialog_runtime_and_handle_from_object<'s>(
@@ -509,6 +529,38 @@ pub(super) fn dialog_close_callback<'s>(
     close_dialog_element(scope, runtime_ptr, handle, parsed.return_value.as_deref());
 }
 
+pub(super) fn dialog_request_close_callback<'s>(
+    scope: &mut v8::PinScope<'s, '_>,
+    args: v8::FunctionCallbackArguments<'s>,
+    _rv: v8::ReturnValue<'_, v8::Value>,
+) {
+    let object = args.this();
+    let Some(parsed) = webidl::parse_args::<DialogRequestCloseArgs>(scope, &args) else {
+        return;
+    };
+    let Ok((runtime_ptr, handle)) = dialog_runtime_and_handle_from_object(scope, object) else {
+        return;
+    };
+    let runtime = unsafe { &*runtime_ptr };
+    if !runtime.dom_host().is_html_element_named(handle, "dialog")
+        || !runtime.dom_host().is_connected(handle)
+        || !element_has_attribute(runtime, handle, "open")
+    {
+        return;
+    }
+    let Some(event) = construct_simple_event(scope, "cancel", false, true, false) else {
+        return;
+    };
+    if !unsafe { &mut *runtime_ptr }.begin_dialog_request_close(handle) {
+        return;
+    }
+    let allows_close = dispatch_public_event(scope, runtime_ptr, handle, event).allows_default();
+    if allows_close {
+        close_dialog_element(scope, runtime_ptr, handle, parsed.return_value.as_deref());
+    }
+    unsafe { &mut *runtime_ptr }.end_dialog_request_close(handle);
+}
+
 pub(in crate::native_bridge::element) fn close_dialog_element(
     scope: &mut v8::PinScope<'_, '_>,
     runtime_ptr: *mut JsContextHost,
diff --git a/moli-renderer-v8/src/script_vm/tests/dom_xhr/forms/dialog.rs b/moli-renderer-v8/src/script_vm/tests/dom_xhr/forms/dialog.rs
index e3d712db41..b6a4e96d3f 100644
--- a/moli-renderer-v8/src/script_vm/tests/dom_xhr/forms/dialog.rs
+++ b/moli-renderer-v8/src/script_vm/tests/dom_xhr/forms/dialog.rs
@@ -70,6 +70,120 @@ async fn dialog_toggle_events_cancel_opening_and_coalesce_state_changes() {
     );
 }
 
+#[tokio::test]
+async fn dialog_request_close_ignores_recursive_cancel_and_queues_close() {
+    let loader = ResourceRequestClient::new(&moli_fetch::FetchConfig::default()).expect("loader");
+    let mut vm = new_storage_page_task_executor_test_vm_with_loader(
+        "https://dialog-request-close-recursive.test/",
+        &loader,
+    );
+
+    let before_close = vm
+        .eval(
+            r#"
+(() => {
+  const host = document.body || document.documentElement || document;
+  const dialog = document.createElement('dialog');
+  host.appendChild(dialog);
+  globalThis.__dialogRequestCloseEvents = [];
+  let cancelCount = 0;
+  dialog.addEventListener('cancel', event => {
+    cancelCount += 1;
+    __dialogRequestCloseEvents.push(`${event.type}:${event.bubbles}:${event.cancelable}`);
+    dialog.requestClose('nested');
+  });
+  dialog.addEventListener('close', event => {
+    __dialogRequestCloseEvents.push(`${event.type}:${event.bubbles}:${event.cancelable}`);
+  });
+
+  dialog.showModal();
+  dialog.requestClose('outer');
+  return JSON.stringify({
+    length: dialog.requestClose.length,
+    cancelCount,
+    open: dialog.open,
+    returnValue: dialog.returnValue,
+    events: __dialogRequestCloseEvents
+  });
+})()
+"#,
+        )
+        .expect("recursive dialog requestClose setup should evaluate");
+
+    assert_eq!(
+        before_close,
+        r#"{"length":1,"cancelCount":1,"open":false,"returnValue":"outer","events":["cancel:false:true"]}"#
+    );
+
+    assert!(
+        !vm.has_ready_timeout(),
+        "dialog requestClose must not create synthetic Page timers"
+    );
+    assert!(
+        vm.run_one_dom_manipulation_task_executor_turn(
+            PageDomManipulationTestFamily::ElementToggle,
+            &loader,
+        )
+        .await
+        .expect("coalesced dialog toggle event should run")
+    );
+    assert!(
+        vm.run_one_user_interaction_executor_turn(&loader)
+            .await
+            .expect("queued dialog close event should run")
+    );
+    let after_close = vm
+        .eval("JSON.stringify(__dialogRequestCloseEvents)")
+        .expect("dialog requestClose event log should evaluate");
+    assert_eq!(after_close, r#"["cancel:false:true","close:false:false"]"#);
+}
+
+#[test]
+fn dialog_request_close_honors_cancellation_and_active_document() {
+    let mut vm = new_storage_test_vm("https://dialog-request-close-state.test/");
+
+    let result = vm
+        .eval(
+            r#"
+(() => {
+  const host = document.body || document.documentElement || document;
+  const dialog = document.createElement('dialog');
+  host.appendChild(dialog);
+  dialog.returnValue = 'seed';
+  dialog.show();
+  dialog.addEventListener('cancel', event => event.preventDefault(), { once: true });
+  dialog.requestClose('blocked');
+  const canceled = [dialog.open, dialog.returnValue];
+  dialog.requestClose('accepted');
+  const accepted = [dialog.open, dialog.returnValue];
+
+  const disconnected = document.createElement('dialog');
+  disconnected.open = true;
+  disconnected.requestClose('disconnected');
+
+  const inactiveDocument = document.implementation.createHTMLDocument('');
+  const inactive = inactiveDocument.createElement('dialog');
+  inactiveDocument.body.appendChild(inactive);
+  inactive.open = true;
+  inactive.requestClose('inactive');
+
+  return JSON.stringify({
+    canceled,
+    accepted,
+    disconnected: [disconnected.open, disconnected.returnValue],
+    inactive: [inactive.open, inactive.returnValue]
+  });
+})()
+"#,
+        )
+        .expect("dialog requestClose state probe should evaluate");
+
+    assert_eq!(
+        result,
+        r#"{"canceled":[true,"seed"],"accepted":[false,"accepted"],"disconnected":[true,""],"inactive":[true,""]}"#
+    );
+}
+
 #[test]
 fn dialog_show_methods_enforce_requested_state_and_active_document() {
     let mut vm = new_storage_test_vm("https://dialog-requested-state.test/");