diff --git a/design/03-rust-web/done/3-19-rust-web-browser-runtime-module-extraction-v1.md b/design/03-rust-web/done/3-19-rust-web-browser-runtime-module-extraction-v1.md
index 99e81f69..85125135 100644
--- a/design/03-rust-web/done/3-19-rust-web-browser-runtime-module-extraction-v1.md
+++ b/design/03-rust-web/done/3-19-rust-web-browser-runtime-module-extraction-v1.md
@@ -696,8 +696,8 @@ Reasonix read-only audit：
 - [x] 浏览器断言：
   - `document.documentElement.dataset.mnoteTreeLiveTransport` 正确。
   - 外置 module 实际执行并设置 `window.__mnoteTreeLiveControllerStarted`。
-- 后续专项验证：WS 推送仍更新 page/filetree。
-- 后续专项验证：WS 不可用时仍 fallback 到 SSE。
+- 后续专项浏览器回归：WS 推送仍更新 page/filetree。
+- 后续专项浏览器回归：强制禁用 WS 时仍 fallback 到 SSE。
 
 ### P3：外置 debug `/tree` shell runtime bridge
 
diff --git a/design/05-editor-mainline/done/5-28-leptos-tiptap-editor-runtime-module-extraction-v1.md b/design/05-editor-mainline/done/5-28-leptos-tiptap-editor-runtime-module-extraction-v1.md
index a08b0b3a..96e668ef 100644
--- a/design/05-editor-mainline/done/5-28-leptos-tiptap-editor-runtime-module-extraction-v1.md
+++ b/design/05-editor-mainline/done/5-28-leptos-tiptap-editor-runtime-module-extraction-v1.md
@@ -470,6 +470,39 @@ Reasonix read-only audit：
 - `node scripts/task488-local-attachment-link-delete-undo-smoke.js`
 - `node scripts/task489-block-menu-delete-undo-smoke.js`
 
+### 10.7 Batch 5 DOM selection 第一刀（2026-05-25）
+
+Codex 主控基于上一批 Reasonix P4 只读审计直接完成：
+
+- 新增 `editor_runtime/dom_selection.rs`。
+- 迁出纯 DOM / selection helper：
+  - `node_is_within_root`
+  - `active_editor_text_selection`
+  - `has_active_text_selection`
+  - `selection_summary`
+  - `selection_has_rich_marks`
+- `src/lib.rs` 保留 `SelectionPayload`、`selection_payload`、`send_selection_state`、`send_selection_state_to_target`、`selection_event_payload` 和事件 dispatch；这些仍依赖 bridge event、`HoveredBlockState`、block id 解析和 target dispatch，后续等 `bridge_events.rs` / overlay state 边界更稳后再迁。
+- `editor_root_element()` 改为 `pub(crate)`，供 `dom_selection.rs` 读取当前编辑器根节点；shell/resource 语义未进入 editor DOM 模块。
+
+已通过验证：
+
+- `cargo fmt --manifest-path rust/Cargo.toml --all --check`
+- `cargo check --manifest-path rust/spikes/leptos-tiptap-spike/Cargo.toml`（35 个既有 warning）
+- `cargo build --manifest-path rust/spikes/leptos-tiptap-spike/Cargo.toml --target wasm32-unknown-unknown --release`（35 个既有 warning）
+- `wasm-bindgen rust/spikes/leptos-tiptap-spike/target/wasm32-unknown-unknown/release/mnote_leptos_tiptap_spike.wasm --target web --out-dir rust/spikes/leptos-tiptap-spike/generated/island --out-name mnote-leptos-tiptap-spike-island`
+- `node scripts/task488-local-attachment-link-delete-undo-smoke.js`
+  - 结果：`ok=true`
+  - 证据：`tmp/task488-local-attachment-link-delete-undo-smoke/result.json`
+- `node scripts/task489-block-menu-delete-undo-smoke.js`
+  - 结果：`ok=true`
+  - 证据：`tmp/task489-block-menu-delete-undo-smoke/result.json`
+  - 备注：首次与 `task488` 并行执行时在 `Ctrl+Z` 等待上超时；单独重跑通过，后续 smoke 建议串行跑编辑器键盘类场景，避免浏览器/服务端时序争用误报。
+
+后续建议：
+
+- 下一刀可迁 `floating_toolbar_anchor_from_selection` / `sync_text_selection_overlay` 等 overlay anchor 纯计算部分进入 `overlays.rs`。
+- `selection_payload` / `send_selection_state*` 应与 `bridge_events.rs` 一起迁，避免为了单次拆分扩大 `SelectionPayload`、`HoveredBlockState` 和 runtime block id 的可见性。
+
 ## 11. 测试与验收
 
 ### Rust 检查
diff --git a/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island.js b/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island.js
index 20fb5a3f..df393296 100644
--- a/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island.js
+++ b/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island.js
@@ -1284,7 +1284,7 @@ function __wbg_get_imports() {
             return ret;
         },
         __wbindgen_cast_0000000000000006: function(arg0, arg1) {
-            // Cast intrinsic for `Closure(Closure { owned: true, function: Function { arguments: [NamedExternref("KeyboardEvent")], shim_idx: 504, ret: Unit, inner_ret: Some(Unit) }, mutable: true }) -> Externref`.
+            // Cast intrinsic for `Closure(Closure { owned: true, function: Function { arguments: [NamedExternref("KeyboardEvent")], shim_idx: 312, ret: Unit, inner_ret: Some(Unit) }, mutable: true }) -> Externref`.
             const ret = makeMutClosure(arg0, arg1, wasm_bindgen__convert__closures_____invoke__hd90af689bc3e71bf);
             return ret;
         },
diff --git a/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island_bg.wasm b/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island_bg.wasm
index be4602a9..4156e2cc 100644
Binary files a/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island_bg.wasm and b/rust/spikes/leptos-tiptap-spike/generated/island/mnote-leptos-tiptap-spike-island_bg.wasm differ
diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/dom_selection.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/dom_selection.rs
new file mode 100644
index 00000000..575ebbcb
--- /dev/null
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/dom_selection.rs
@@ -0,0 +1,105 @@
+use leptos_tiptap::TiptapSelectionState;
+use web_sys::{window, Element, Node};
+
+use crate::editor_root_element;
+
+pub(crate) fn node_is_within_root(node: Node, root: &Element) -> bool {
+    let mut current = Some(node);
+    while let Some(node) = current {
+        if node.is_same_node(Some(root)) {
+            return true;
+        }
+        current = node.parent_node();
+    }
+    false
+}
+
+pub(crate) fn active_editor_text_selection() -> Option<web_sys::Selection> {
+    let selection = window().and_then(|win| win.get_selection().ok().flatten())?;
+    if selection.is_collapsed() {
+        return None;
+    }
+
+    let root = editor_root_element()?;
+    let anchor_inside = selection
+        .anchor_node()
+        .map(|node| node_is_within_root(node, &root))
+        .unwrap_or(false);
+    let focus_inside = selection
+        .focus_node()
+        .map(|node| node_is_within_root(node, &root))
+        .unwrap_or(false);
+
+    if anchor_inside || focus_inside {
+        Some(selection)
+    } else {
+        None
+    }
+}
+
+pub(crate) fn has_active_text_selection() -> bool {
+    active_editor_text_selection().is_some()
+}
+
+pub(crate) fn selection_summary(selection: &TiptapSelectionState) -> String {
+    let block = if selection.h1 {
+        "一级标题"
+    } else if selection.h2 {
+        "二级标题"
+    } else if selection.h3 {
+        "三级标题"
+    } else if selection.task_list {
+        "Todo 列表"
+    } else if selection.ordered_list {
+        "有序列表"
+    } else if selection.bullet_list {
+        "无序列表"
+    } else if selection.blockquote {
+        "引用块"
+    } else if selection.paragraph {
+        "段落"
+    } else {
+        "未定位"
+    };
+
+    let mut marks = Vec::new();
+    if selection.bold {
+        marks.push("Bold");
+    }
+    if selection.italic {
+        marks.push("Italic");
+    }
+    if selection.underline {
+        marks.push("Underline");
+    }
+    if selection.strike {
+        marks.push("Strike");
+    }
+    if selection.highlight {
+        marks.push("Highlight");
+    }
+    if selection.text_style {
+        marks.push("Color");
+    }
+    if selection.link {
+        marks.push("Link");
+    }
+
+    let mark_text = if marks.is_empty() {
+        "无行内样式".to_string()
+    } else {
+        marks.join(" / ")
+    };
+
+    format!("当前块：{block} | 行内样式：{mark_text}")
+}
+
+pub(crate) fn selection_has_rich_marks(selection: &TiptapSelectionState) -> bool {
+    selection.bold
+        || selection.italic
+        || selection.underline
+        || selection.strike
+        || selection.highlight
+        || selection.text_style
+        || selection.link
+}
diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs
index 4eb1a916..397ef0eb 100644
--- a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs
@@ -1,5 +1,6 @@
 pub(crate) mod attachment_links;
 pub(crate) mod attachment_upload;
 pub(crate) mod command_sync;
+pub(crate) mod dom_selection;
 pub(crate) mod history_safe_commands;
 pub(crate) mod persistence;
diff --git a/rust/spikes/leptos-tiptap-spike/src/lib.rs b/rust/spikes/leptos-tiptap-spike/src/lib.rs
index bf0279d7..53d250f7 100644
--- a/rust/spikes/leptos-tiptap-spike/src/lib.rs
+++ b/rust/spikes/leptos-tiptap-spike/src/lib.rs
@@ -24,6 +24,10 @@ use editor_runtime::attachment_upload::dispatch_editor_upload_request;
 use editor_runtime::command_sync::{
     read_editor_snapshot, sync_editor_outputs, sync_persisted_editor_command,
 };
+use editor_runtime::dom_selection::{
+    active_editor_text_selection, has_active_text_selection, node_is_within_root,
+    selection_summary,
+};
 use editor_runtime::persistence::{
     load_persisted_document, normalize_identity_value, persist_document_state,
     persisted_document_identity, PersistedDocumentIdentity,
@@ -5015,7 +5019,7 @@ where
     dispatch_runtime_event(event_name, payload);
 }
 
-fn editor_root_element() -> Option<Element> {
+pub(crate) fn editor_root_element() -> Option<Element> {
     window()
         .and_then(|win| win.document())
         .and_then(|document| document.query_selector(EDITOR_ROOT_SELECTOR).ok().flatten())
@@ -5334,40 +5338,6 @@ fn top_level_block_range(document: &Value, index: usize) -> Option<TiptapRange>
     None
 }
 
-fn node_is_within_root(node: Node, root: &Element) -> bool {
-    let mut current = Some(node);
-    while let Some(node) = current {
-        if node.is_same_node(Some(root)) {
-            return true;
-        }
-        current = node.parent_node();
-    }
-    false
-}
-
-fn active_editor_text_selection() -> Option<web_sys::Selection> {
-    let selection = window().and_then(|win| win.get_selection().ok().flatten())?;
-    if selection.is_collapsed() {
-        return None;
-    }
-
-    let root = editor_root_element()?;
-    let anchor_inside = selection
-        .anchor_node()
-        .map(|node| node_is_within_root(node, &root))
-        .unwrap_or(false);
-    let focus_inside = selection
-        .focus_node()
-        .map(|node| node_is_within_root(node, &root))
-        .unwrap_or(false);
-
-    if anchor_inside || focus_inside {
-        Some(selection)
-    } else {
-        None
-    }
-}
-
 fn floating_toolbar_anchor_from_selection() -> Option<FloatingToolbarAnchor> {
     let selection = active_editor_text_selection()?;
     let range = selection.get_range_at(0).ok()?;
@@ -5866,10 +5836,6 @@ fn replace_top_level_block_kind(
     Ok(())
 }
 
-fn has_active_text_selection() -> bool {
-    active_editor_text_selection().is_some()
-}
-
 fn toolbar_overlay_locked(
     turn_into_open: bool,
     color_menu_open: bool,
@@ -6534,59 +6500,6 @@ fn active_editor_stage() -> bool {
     anchor_inside || focus_inside
 }
 
-fn selection_summary(selection: &TiptapSelectionState) -> String {
-    let block = if selection.h1 {
-        "一级标题"
-    } else if selection.h2 {
-        "二级标题"
-    } else if selection.h3 {
-        "三级标题"
-    } else if selection.task_list {
-        "Todo 列表"
-    } else if selection.ordered_list {
-        "有序列表"
-    } else if selection.bullet_list {
-        "无序列表"
-    } else if selection.blockquote {
-        "引用块"
-    } else if selection.paragraph {
-        "段落"
-    } else {
-        "未定位"
-    };
-
-    let mut marks = Vec::new();
-    if selection.bold {
-        marks.push("Bold");
-    }
-    if selection.italic {
-        marks.push("Italic");
-    }
-    if selection.underline {
-        marks.push("Underline");
-    }
-    if selection.strike {
-        marks.push("Strike");
-    }
-    if selection.highlight {
-        marks.push("Highlight");
-    }
-    if selection.text_style {
-        marks.push("Color");
-    }
-    if selection.link {
-        marks.push("Link");
-    }
-
-    let mark_text = if marks.is_empty() {
-        "无行内样式".to_string()
-    } else {
-        marks.join(" / ")
-    };
-
-    format!("当前块：{block} | 行内样式：{mark_text}")
-}
-
 fn current_block_info_from_index(index: Option<usize>) -> CurrentBlockInfo {
     index
         .map(|value| CurrentBlockInfo {
@@ -6860,16 +6773,6 @@ fn bridge_ready_payload() -> ReadyPayload {
     }
 }
 
-fn selection_has_rich_marks(selection: &TiptapSelectionState) -> bool {
-    selection.bold
-        || selection.italic
-        || selection.underline
-        || selection.strike
-        || selection.highlight
-        || selection.text_style
-        || selection.link
-}
-
 fn apply_text_color(editor: TiptapEditorHandle, color: &str) -> Result<&'static str, String> {
     editor
         .set_color(TiptapColorAttributes {