diff --git a/apps/web/src/lib/restore-test-global.mjs b/apps/web/src/lib/restore-test-global.mjs
index 7f145639..fdf1251b 100644
--- a/apps/web/src/lib/restore-test-global.mjs
+++ b/apps/web/src/lib/restore-test-global.mjs
@@ -1,12 +1,28 @@
 const restoreUnconditionally = Symbol("restore-unconditionally");
 const noop = () => {};
 
-// Linux Bun exposes `document` without a `window` binding. Test files then
-// install plain objects. ProseMirror and TipTap read `window.MutationObserver`
-// and `window.addEventListener` from that object, so a leftover stub needs
-// those methods. Do not create a window when none is installed: assigning one
-// is unnecessary on hosts whose editor already resolves `window` elsewhere.
+// Linux Bun can be left with a plain window object, or with a linkedom
+// document whose view is not installed as `window`. TipTap reads
+// `window.addEventListener` and appends CSS to `document.head`.
+export const ensureTestDocumentHead = () => {
+  const doc = globalThis.document;
+  if (!doc || typeof doc.createElement !== "function" || typeof doc.getElementsByTagName !== "function") return;
+  if (doc.getElementsByTagName("head")[0]) return;
+  const head = doc.createElement("head");
+  const html = doc.documentElement;
+  if (html && typeof html.insertBefore === "function") {
+    html.insertBefore(head, html.firstChild ?? null);
+    return;
+  }
+  if (typeof doc.appendChild === "function") doc.appendChild(head);
+};
+
 export const ensureTestWindowDom = () => {
+  const view = globalThis.document?.defaultView;
+  if (view && typeof globalThis.window?.addEventListener !== "function") {
+    globalThis.window = view;
+  }
+  ensureTestDocumentHead();
   const current = globalThis.window;
   if (!current || typeof current !== "object") return;
   if (typeof current.addEventListener !== "function") current.addEventListener = noop;
diff --git a/apps/web/src/lib/restore-test-global.test.mjs b/apps/web/src/lib/restore-test-global.test.mjs
index 7e8f64cf..0bc6d8ea 100644
--- a/apps/web/src/lib/restore-test-global.test.mjs
+++ b/apps/web/src/lib/restore-test-global.test.mjs
@@ -1,9 +1,8 @@
 import { expect, test } from "bun:test";
-import { ensureTestWindowDom, restoreTestGlobal } from "./restore-test-global.mjs";
+import { ensureTestDocumentHead, ensureTestWindowDom, restoreTestGlobal } from "./restore-test-global.mjs";
 
 test("restoreTestGlobal keeps a window object when nothing was there before", () => {
   const descriptor = Object.getOwnPropertyDescriptor(globalThis, "window");
-  delete globalThis.window;
   const stub = { localStorage: {} };
   globalThis.window = stub;
   restoreTestGlobal("window", undefined, stub);
@@ -26,6 +25,50 @@ test("restoreTestGlobal leaves a global that another file replaced", () => {
   else delete globalThis.document;
 });
 
+test("ensureTestDocumentHead inserts a head when the document has none", () => {
+  const descriptor = Object.getOwnPropertyDescriptor(globalThis, "document");
+  const heads = [];
+  const html = {
+    firstChild: null,
+    insertBefore(node) {
+      heads.push(node);
+    },
+  };
+  globalThis.document = {
+    documentElement: html,
+    createElement: (name) => ({ nodeName: name, appendChild() {} }),
+    getElementsByTagName: (name) => (name === "head" ? heads : []),
+  };
+  ensureTestDocumentHead();
+  expect(heads).toHaveLength(1);
+  ensureTestDocumentHead();
+  expect(heads).toHaveLength(1);
+  if (descriptor) Object.defineProperty(globalThis, "document", descriptor);
+  else delete globalThis.document;
+});
+
+test("ensureTestWindowDom uses the document view when the leftover window cannot listen", () => {
+  const windowDescriptor = Object.getOwnPropertyDescriptor(globalThis, "window");
+  const documentDescriptor = Object.getOwnPropertyDescriptor(globalThis, "document");
+  const view = {
+    addEventListener() {},
+    removeEventListener() {},
+  };
+  globalThis.document = {
+    defaultView: view,
+    documentElement: { insertBefore() {} },
+    createElement: (name) => ({ nodeName: name }),
+    getElementsByTagName: () => [{}],
+  };
+  globalThis.window = { edgeeverDesktop: { isAvailable: true } };
+  ensureTestWindowDom();
+  expect(globalThis.window).toBe(view);
+  if (windowDescriptor) Object.defineProperty(globalThis, "window", windowDescriptor);
+  else delete globalThis.window;
+  if (documentDescriptor) Object.defineProperty(globalThis, "document", documentDescriptor);
+  else delete globalThis.document;
+});
+
 test("ensureTestWindowDom fills event methods on a leftover window", () => {
   const descriptor = Object.getOwnPropertyDescriptor(globalThis, "window");
   const stub = { edgeeverDesktop: { isAvailable: true } };
diff --git a/apps/web/src/lib/wechat-copy.test.mjs b/apps/web/src/lib/wechat-copy.test.mjs
index e4ec1297..5638838d 100644
--- a/apps/web/src/lib/wechat-copy.test.mjs
+++ b/apps/web/src/lib/wechat-copy.test.mjs
@@ -1,19 +1,39 @@
-import { beforeAll, describe, expect, test } from "bun:test";
+import { afterAll, beforeAll, describe, expect, test } from "bun:test";
 import { parseHTML } from "../../../../node_modules/.bun/linkedom@0.18.13/node_modules/linkedom/esm/index.js";
 
-const window = parseHTML("<!DOCTYPE html><html><body></body></html>");
+const originalWindow = Object.getOwnPropertyDescriptor(globalThis, "window");
+const originalDocument = Object.getOwnPropertyDescriptor(globalThis, "document");
+const originalNode = Object.getOwnPropertyDescriptor(globalThis, "Node");
+const originalHTMLElement = Object.getOwnPropertyDescriptor(globalThis, "HTMLElement");
+const originalGetComputedStyle = Object.getOwnPropertyDescriptor(globalThis, "getComputedStyle");
+
+const linkedomWindow = parseHTML("<!DOCTYPE html><html><head></head><body></body></html>");
 try {
-  Object.defineProperty(window.document, "compatMode", { value: "CSS1Compat" });
+  Object.defineProperty(linkedomWindow.document, "compatMode", { value: "CSS1Compat" });
 } catch {
   // linkedom may already expose a read-only quirks flag. KaTeX still renders.
 }
-globalThis.document = window.document;
-globalThis.Node = window.Node;
-globalThis.HTMLElement = window.HTMLElement;
-globalThis.getComputedStyle = typeof window.getComputedStyle === "function"
-  ? window.getComputedStyle.bind(window)
+globalThis.window = linkedomWindow;
+globalThis.document = linkedomWindow.document;
+globalThis.Node = linkedomWindow.Node;
+globalThis.HTMLElement = linkedomWindow.HTMLElement;
+globalThis.getComputedStyle = typeof linkedomWindow.getComputedStyle === "function"
+  ? linkedomWindow.getComputedStyle.bind(linkedomWindow)
   : () => ({ getPropertyValue: () => "" });
 
+const restoreGlobal = (name, descriptor) => {
+  if (descriptor) Object.defineProperty(globalThis, name, descriptor);
+  else delete globalThis[name];
+};
+
+afterAll(() => {
+  restoreGlobal("window", originalWindow);
+  restoreGlobal("document", originalDocument);
+  restoreGlobal("Node", originalNode);
+  restoreGlobal("HTMLElement", originalHTMLElement);
+  restoreGlobal("getComputedStyle", originalGetComputedStyle);
+});
+
 const css = (element) => (element?.style.cssText ?? "").replace(/:\s+/g, ":");
 
 let preparePublishArticle;