diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 376f26399..586cbafe9 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -97,7 +97,7 @@ jobs:
         run: >
           pnpm exec vitest run
           --coverage
-          --silent
+          --silent=passed-only
           --reporter=blob
           --shard=${{ matrix.shardIndex }}/${{ matrix.shardTotal }}
 
@@ -158,6 +158,7 @@ jobs:
           pnpm exec vitest
           --merge-reports
           --coverage
+          --silent=passed-only
           --reporter=default
           --reporter.default.summary=false
 
diff --git a/packages/message/custom_event_message.test.ts b/packages/message/custom_event_message.test.ts
new file mode 100644
index 000000000..190d7f3cb
--- /dev/null
+++ b/packages/message/custom_event_message.test.ts
@@ -0,0 +1,152 @@
+import { describe, expect, it } from "vitest";
+import { CustomEventMessage } from "./custom_event_message";
+import { createMouseEvent, pageDispatchEvent } from "@Packages/message/common";
+
+let flagCounter = 0;
+
+function createMessagePair() {
+  const eventFlag = `custom-event-message-test-${++flagCounter}`;
+  const sender = new CustomEventMessage(eventFlag, false, "");
+  const receiver = new CustomEventMessage(eventFlag, true, "");
+
+  expect(sender.readyWrap.isReady).toBe(true);
+  expect(receiver.readyWrap.isReady).toBe(true);
+  expect(sender.relatedTarget).toHaveProperty("size", 0);
+  expect(receiver.relatedTarget).toHaveProperty("size", 0);
+  return { sender, receiver };
+}
+
+describe("CustomEventMessage relatedTarget lifecycle", () => {
+  it("stores a received target on the receiving message until it is consumed", () => {
+    const { sender, receiver } = createMessagePair();
+    const target = document.createElement("div");
+    const id = sender.sendRelatedTarget(target);
+
+    try {
+      expect(receiver.relatedTarget.get(id)).toBe(target);
+      expect(receiver.relatedTarget).toHaveProperty("size", 1);
+
+      expect(receiver.getAndDelRelatedTarget(id)).toBe(target);
+      expect(receiver.relatedTarget.has(id)).toBe(false);
+    } finally {
+      receiver.getAndDelRelatedTarget(id);
+    }
+  });
+
+  it("releases multiple targets after out-of-order consumption", () => {
+    const { sender, receiver } = createMessagePair();
+    const targets = [document.createElement("div"), document.createElement("span"), document.createElement("p")];
+    const ids = targets.map((target) => sender.sendRelatedTarget(target));
+
+    try {
+      expect(receiver.relatedTarget).toHaveProperty("size", targets.length);
+      expect(receiver.getAndDelRelatedTarget(ids[1])).toBe(targets[1]);
+      expect(receiver.relatedTarget).toHaveProperty("size", 2);
+      expect(receiver.getAndDelRelatedTarget(ids[1])).toBeUndefined();
+      expect(receiver.relatedTarget).toHaveProperty("size", 2);
+      expect(receiver.getAndDelRelatedTarget(ids[2])).toBe(targets[2]);
+      expect(receiver.getAndDelRelatedTarget(ids[0])).toBe(targets[0]);
+      expect(receiver.relatedTarget).toHaveProperty("size", 0);
+    } finally {
+      ids.forEach((id) => receiver.getAndDelRelatedTarget(id));
+    }
+  });
+
+  it("does not let an unknown target id affect queued targets", () => {
+    const { sender, receiver } = createMessagePair();
+    const target = document.createElement("div");
+    const id = sender.sendRelatedTarget(target);
+
+    try {
+      expect(receiver.getAndDelRelatedTarget(id + 1)).toBeUndefined();
+      expect(receiver.relatedTarget).toHaveProperty("size", 1);
+      expect(receiver.getAndDelRelatedTarget(id)).toBe(target);
+      expect(receiver.getAndDelRelatedTarget(id)).toBeUndefined();
+      expect(receiver.relatedTarget).toHaveProperty("size", 0);
+    } finally {
+      receiver.getAndDelRelatedTarget(id);
+    }
+  });
+
+  it("keeps targets from opposite message directions independently owned", () => {
+    const { sender, receiver } = createMessagePair();
+    const senderTarget = document.createElement("div");
+    const receiverTarget = document.createElement("span");
+    const senderTargetId = sender.sendRelatedTarget(senderTarget);
+    const receiverTargetId = receiver.sendRelatedTarget(receiverTarget);
+
+    try {
+      expect(receiver.relatedTarget.get(senderTargetId)).toBe(senderTarget);
+      expect(sender.relatedTarget.get(receiverTargetId)).toBe(receiverTarget);
+      expect(sender.relatedTarget.get(senderTargetId)).toBeUndefined();
+      expect(receiver.relatedTarget.get(receiverTargetId)).toBeUndefined();
+      expect(sender.getAndDelRelatedTarget(senderTargetId)).toBeUndefined();
+      expect(receiver.getAndDelRelatedTarget(receiverTargetId)).toBeUndefined();
+      expect(receiver.getAndDelRelatedTarget(senderTargetId)).toBe(senderTarget);
+      expect(sender.getAndDelRelatedTarget(receiverTargetId)).toBe(receiverTarget);
+      expect(sender.relatedTarget.has(senderTargetId)).toBe(false);
+      expect(receiver.relatedTarget.has(receiverTargetId)).toBe(false);
+    } finally {
+      sender.getAndDelRelatedTarget(senderTargetId);
+      receiver.getAndDelRelatedTarget(receiverTargetId);
+    }
+  });
+
+  it("keeps targets from different event channels independently owned", () => {
+    const first = createMessagePair();
+    const second = createMessagePair();
+    const firstTarget = document.createElement("div");
+    const secondTarget = document.createElement("span");
+    const firstId = first.sender.sendRelatedTarget(firstTarget);
+    const secondId = second.sender.sendRelatedTarget(secondTarget);
+
+    try {
+      expect(first.receiver.getAndDelRelatedTarget(secondId)).toBeUndefined();
+      expect(second.receiver.getAndDelRelatedTarget(firstId)).toBeUndefined();
+      expect(first.receiver.getAndDelRelatedTarget(firstId)).toBe(firstTarget);
+      expect(second.receiver.getAndDelRelatedTarget(secondId)).toBe(secondTarget);
+      expect(first.receiver.relatedTarget).toHaveProperty("size", 0);
+      expect(second.receiver.relatedTarget).toHaveProperty("size", 0);
+    } finally {
+      first.receiver.getAndDelRelatedTarget(firstId);
+      second.receiver.getAndDelRelatedTarget(secondId);
+    }
+  });
+
+  it("does not retain entries for ordinary messages or unrelated mouse events", async () => {
+    const { sender, receiver } = createMessagePair();
+    receiver.onMessage((_data, sendResponse) => sendResponse({ code: 0, data: "ok" }));
+
+    expect(
+      await sender.sendMessage({
+        action: "custom-event-message-test/ordinary-async",
+        data: {},
+      })
+    ).toEqual({ code: 0, data: "ok" });
+    expect(sender.syncSendMessage({ action: "custom-event-message-test/ordinary-sync", data: {} })).toEqual({
+      code: 0,
+      data: "ok",
+    });
+
+    pageDispatchEvent(
+      createMouseEvent(receiver.receiveFlag, {
+        movementX: 0,
+        relatedTarget: document.createElement("div"),
+        cancelable: true,
+      })
+    );
+    pageDispatchEvent(createMouseEvent(receiver.receiveFlag, { movementX: 1, cancelable: true }));
+
+    expect(sender.relatedTarget).toHaveProperty("size", 0);
+    expect(receiver.relatedTarget).toHaveProperty("size", 0);
+  });
+
+  it("does not retain entries when sending before the channel is ready", () => {
+    const sender = new CustomEventMessage(`custom-event-message-test-${++flagCounter}`, false, "");
+    const target = document.createElement("div");
+
+    expect(sender.readyWrap.isReady).toBe(false);
+    expect(() => sender.sendRelatedTarget(target)).toThrow("custom_event_message is not ready.");
+    expect(sender.relatedTarget).toHaveProperty("size", 0);
+  });
+});
diff --git a/packages/message/custom_event_message.ts b/packages/message/custom_event_message.ts
index 5d09f5afa..63b33038a 100644
--- a/packages/message/custom_event_message.ts
+++ b/packages/message/custom_event_message.ts
@@ -15,10 +15,19 @@ import { ReadyWrap } from "@App/pkg/utils/ready-wrap";
 import type { ScriptEnvTag } from "@Packages/message/consts";
 
 // 避免页面载入后改动 Map.prototype 导致消息传递失败
-const relatedTargetMap = new Map<number, EventTarget>();
-relatedTargetMap.set = Map.prototype.set;
-relatedTargetMap.get = Map.prototype.get;
-relatedTargetMap.delete = Map.prototype.delete;
+const relatedTargetMapMethods = {
+  set: Map.prototype.set,
+  get: Map.prototype.get,
+  delete: Map.prototype.delete,
+};
+
+function createRelatedTargetMap() {
+  const map = new Map<number, EventTarget>();
+  map.set = relatedTargetMapMethods.set;
+  map.get = relatedTargetMapMethods.get;
+  map.delete = relatedTargetMapMethods.delete;
+  return map;
+}
 
 let relateId = 0;
 const maxInteger = Number.MAX_SAFE_INTEGER;
@@ -38,7 +47,7 @@ export class CustomEventMessage implements Message {
   readonly sendFlag: string;
 
   // 关联dom目标
-  relatedTarget: Map<number, EventTarget> = new Map();
+  relatedTarget: Map<number, EventTarget> = createRelatedTargetMap();
   readyWrap: ReadyWrap = new ReadyWrap();
 
   constructor(
@@ -55,7 +64,7 @@ export class CustomEventMessage implements Message {
         this.readyWrap.setReady(); // 两端已准备好，则 setReady()
       } else if (event instanceof MouseEventClone && event.movementX && event.relatedTarget) {
         if (event.cancelable) event.preventDefault(); // 告知另一端
-        relatedTargetMap.set(event.movementX, event.relatedTarget);
+        this.relatedTarget.set(event.movementX, event.relatedTarget);
       } else if (event instanceof CustomEventClone) {
         this.messageHandle(event.detail, new CustomEventPostMessage(this));
       }
@@ -185,8 +194,8 @@ export class CustomEventMessage implements Message {
   }
 
   getAndDelRelatedTarget(id: number) {
-    const target = relatedTargetMap.get(id);
-    relatedTargetMap.delete(id);
+    const target = this.relatedTarget.get(id);
+    this.relatedTarget.delete(id);
     return target;
   }
 }
diff --git a/src/app/service/content/gm_api/related_target_lifecycle.test.ts b/src/app/service/content/gm_api/related_target_lifecycle.test.ts
new file mode 100644
index 000000000..722111552
--- /dev/null
+++ b/src/app/service/content/gm_api/related_target_lifecycle.test.ts
@@ -0,0 +1,75 @@
+import { describe, expect, it } from "vitest";
+import { ScriptEnvTag } from "@Packages/message/consts";
+import { CustomEventMessage } from "@Packages/message/custom_event_message";
+import { Server } from "@Packages/message/server";
+import type { ScriptRunResource } from "@App/app/repo/scripts";
+import { ScriptExecutor } from "../script_executor";
+import { ScriptRuntime } from "../script_runtime";
+import GMApi from "./gm_api";
+
+let flagCounter = 0;
+
+function createApiWithContentRuntime() {
+  const eventFlag = `related-target-lifecycle-test-${++flagCounter}`;
+  const sender = new CustomEventMessage(eventFlag, false, "");
+  const receiver = new CustomEventMessage(eventFlag, true, "");
+  const server = new Server("content", receiver);
+  const runtime = new ScriptRuntime(
+    ScriptEnvTag.content,
+    server,
+    receiver,
+    new ScriptExecutor(receiver, receiver),
+    undefined
+  );
+  runtime.contentInit();
+
+  const scriptRes: ScriptRunResource = {
+    uuid: "related-target-lifecycle-test",
+    name: "related-target-lifecycle-test",
+    namespace: "test",
+    metadata: {},
+    sort: 0,
+    type: 1,
+    status: 1,
+    runStatus: "complete",
+    createtime: 0,
+    checktime: 0,
+    code: "",
+    value: {},
+    flag: "related-target-lifecycle-test",
+    resource: {},
+    originalMetadata: {},
+  };
+  const api = new GMApi("test", sender, sender, scriptRes);
+  return { api, sender, receiver };
+}
+
+describe("relatedTarget lifecycle across content runtime callers", () => {
+  it("consumes returned elements and parent nodes for GM DOM operations", () => {
+    const { api, sender, receiver } = createApiWithContentRuntime();
+    const parent = document.createElement("section");
+
+    try {
+      const style = api.GM_addStyle("body { color: red; }");
+      expect(style?.tagName).toBe("STYLE");
+      expect(style?.textContent).toBe("body { color: red; }");
+      expect(sender.relatedTarget).toHaveProperty("size", 0);
+      expect(receiver.relatedTarget).toHaveProperty("size", 0);
+
+      const child = api.GM_addElement(parent, "span", { id: "child" });
+      expect(child?.parentNode).toBe(parent);
+      expect(child?.id).toBe("child");
+      expect(sender.relatedTarget).toHaveProperty("size", 0);
+      expect(receiver.relatedTarget).toHaveProperty("size", 0);
+
+      const root = api.GM_addElement("div", { id: "root" });
+      expect(root?.tagName).toBe("DIV");
+      expect(root?.id).toBe("root");
+      expect(sender.relatedTarget).toHaveProperty("size", 0);
+      expect(receiver.relatedTarget).toHaveProperty("size", 0);
+    } finally {
+      sender.relatedTarget.clear();
+      receiver.relatedTarget.clear();
+    }
+  });
+});