From d4cc13fbcfbf68dfab1a4a6831c6dc623cd8cbb8 Mon Sep 17 00:00:00 2001
From: ldm0 <ldm2993593805@163.com>
Date: Thu, 3 Sep 2026 03:23:59 +0800
Subject: [PATCH] fix(inert): blur focus after dynamic activation

---
 .../src/document_runtime/mutation_commands.rs | 15 ++++
 .../src/script_vm/tests/dom_xhr/shadow_dom.rs | 72 +++++++++++++++++++
 2 files changed, 87 insertions(+)

diff --git a/moli-renderer-v8/src/document_runtime/mutation_commands.rs b/moli-renderer-v8/src/document_runtime/mutation_commands.rs
index eb03c18604..35378488e7 100644
--- a/moli-renderer-v8/src/document_runtime/mutation_commands.rs
+++ b/moli-renderer-v8/src/document_runtime/mutation_commands.rs
@@ -240,6 +240,21 @@ impl DocumentRuntime {
         crate::native_bridge::element::handle_popover_attribute_change(
             scope, host_ptr, handle, namespace, local_name, old_value, new_value,
         );
+        if namespace.is_none()
+            && local_name.eq_ignore_ascii_case("inert")
+            && old_value.is_none()
+            && new_value.is_some()
+            && self
+                .dom_host
+                .node(handle)
+                .and_then(Node::as_element)
+                .is_some_and(|element| {
+                    element.namespace() == crate::native_bridge::document::XHTML_NS
+                })
+            && let Some(active) = self.active_element_handle()
+        {
+            crate::native_bridge::element::schedule_focus_blur_if_needed(scope, host_ptr, active);
+        }
     }
 
     pub(crate) fn set_text_content(
diff --git a/moli-renderer-v8/src/script_vm/tests/dom_xhr/shadow_dom.rs b/moli-renderer-v8/src/script_vm/tests/dom_xhr/shadow_dom.rs
index f37d798483..2326ad37f0 100644
--- a/moli-renderer-v8/src/script_vm/tests/dom_xhr/shadow_dom.rs
+++ b/moli-renderer-v8/src/script_vm/tests/dom_xhr/shadow_dom.rs
@@ -2535,6 +2535,78 @@ async fn focused_display_none_blur_listener_sees_updated_focus_state() {
     assert_eq!(sync_state, "none|true|true");
     assert_eq!(blur_state, "block,true,true|block");
 }
+
+#[tokio::test]
+async fn focused_element_blurs_after_it_becomes_inert() {
+    let loader = ResourceRequestClient::new(&moli_fetch::FetchConfig::default()).expect("loader");
+    let mut vm =
+        new_storage_test_vm_with_loader("https://dynamic-inert-focus-fixup.test/", &loader);
+
+    let direct_sync_state = vm
+        .eval(
+            r#"
+(() => {
+  const html = document.documentElement || document.appendChild(document.createElement('html'));
+  const body = document.body || html.appendChild(document.createElement('body'));
+  const wrapper = document.createElement('div');
+  const input = document.createElement('input');
+  wrapper.appendChild(input);
+  body.appendChild(wrapper);
+  globalThis.__dynamicInertFocus = { wrapper, input, blurCount: 0 };
+  input.addEventListener('blur', () => globalThis.__dynamicInertFocus.blurCount++);
+  input.focus();
+  input.inert = true;
+  return [document.activeElement === input, globalThis.__dynamicInertFocus.blurCount].join('|');
+})()
+"#,
+        )
+        .expect("direct inert focus setup should evaluate");
+
+    assert!(
+        vm.run_next_due_timer_callback_for_test(&loader)
+            .await
+            .expect("direct inert focus-fixup timer should run")
+    );
+    let direct_async_state = vm
+        .eval(
+            r#"
+[document.activeElement === document.body, globalThis.__dynamicInertFocus.blurCount].join('|')
+"#,
+        )
+        .expect("direct inert focus-fixup result should evaluate");
+
+    let ancestor_sync_state = vm
+        .eval(
+            r#"
+(() => {
+  const { wrapper, input } = globalThis.__dynamicInertFocus;
+  input.inert = false;
+  input.focus();
+  wrapper.setAttribute('inert', '');
+  return [document.activeElement === input, globalThis.__dynamicInertFocus.blurCount].join('|');
+})()
+"#,
+        )
+        .expect("ancestor inert focus setup should evaluate");
+
+    assert!(
+        vm.run_next_due_timer_callback_for_test(&loader)
+            .await
+            .expect("ancestor inert focus-fixup timer should run")
+    );
+    let ancestor_async_state = vm
+        .eval(
+            r#"
+[document.activeElement === document.body, globalThis.__dynamicInertFocus.blurCount].join('|')
+"#,
+        )
+        .expect("ancestor inert focus-fixup result should evaluate");
+
+    assert_eq!(direct_sync_state, "true|0");
+    assert_eq!(direct_async_state, "true|1");
+    assert_eq!(ancestor_sync_state, "true|1");
+    assert_eq!(ancestor_async_state, "true|2");
+}
 #[test]
 fn scroll_container_focusability_tracks_current_layout() {
     let mut vm = new_storage_test_vm("https://scroll-focusability.test/");