diff --git a/package.json b/package.json
index ac8ff1b64..190efc268 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "ci:build": "yarn build:types && yarn build all && yarn build:i18n && yarn build:ts && yarn build:docs && yarn test:imports",
     "test:imports": "node --test test/esm.test.js test/i18n.test.js test/ssr.test.js",
     "typecheck": "node scripts/typecheck.mjs",
-    "test:unit": "node --test test/canvas.test.js test/canvas-lifecycle.test.js test/ambilight.test.js test/ambilight-lifecycle.test.js test/ambilight-proxy.test.js test/vast.test.js test/vast-lifecycle.test.js test/ads.test.js test/ads-lifecycle.test.js test/playback.test.js test/dash-control.test.js test/dash-contract.test.js test/dash-lifecycle.test.js test/dash-events.test.js test/hls-control.test.js test/audio-track.test.js test/public-behavior.test.js test/helpers.test.js test/chapter.test.js test/utils.test.js test/resource-scope.test.js test/instance-lifecycle.test.js test/options.test.js test/media-hosts.test.js test/plugins.test.js test/source.test.js test/playback-properties.test.js test/media-events.test.js test/template-resources.test.js test/core-vendor.test.js test/component-resources.test.js test/setting-model.test.js test/setting-layout.test.js test/setting-resources.test.js test/subtitle.test.js test/display-native.test.js test/display-video-fullscreen.test.js test/display-pip.test.js test/display-mini.test.js test/display-sizing.test.js test/display-orientation.test.js test/hotkey.test.js test/listener-registry.test.js test/global-events.test.js test/pointer-events.test.js test/gesture.test.js test/event-scheduling.test.js test/notice.test.js test/fast-forward.test.js test/auto-playback.test.js test/builtin-layers.test.js test/prompt-components.test.js test/screenshot.test.js test/thumbnails.test.js test/progress.test.js test/environment.test.js test/storage.test.js test/facade-properties.test.js test/dom-boundaries.test.js test/initialization.test.js test/entry.test.js test/accessibility-button.test.js test/accessibility-focus.test.js test/accessibility-slider.test.js",
+    "test:unit": "node --test test/dpip.test.js test/canvas.test.js test/canvas-lifecycle.test.js test/ambilight.test.js test/ambilight-lifecycle.test.js test/ambilight-proxy.test.js test/vast.test.js test/vast-lifecycle.test.js test/ads.test.js test/ads-lifecycle.test.js test/playback.test.js test/dash-control.test.js test/dash-contract.test.js test/dash-lifecycle.test.js test/dash-events.test.js test/hls-control.test.js test/audio-track.test.js test/public-behavior.test.js test/helpers.test.js test/chapter.test.js test/utils.test.js test/resource-scope.test.js test/instance-lifecycle.test.js test/options.test.js test/media-hosts.test.js test/plugins.test.js test/source.test.js test/playback-properties.test.js test/media-events.test.js test/template-resources.test.js test/core-vendor.test.js test/component-resources.test.js test/setting-model.test.js test/setting-layout.test.js test/setting-resources.test.js test/subtitle.test.js test/display-native.test.js test/display-video-fullscreen.test.js test/display-pip.test.js test/display-mini.test.js test/display-sizing.test.js test/display-orientation.test.js test/hotkey.test.js test/listener-registry.test.js test/global-events.test.js test/pointer-events.test.js test/gesture.test.js test/event-scheduling.test.js test/notice.test.js test/fast-forward.test.js test/auto-playback.test.js test/builtin-layers.test.js test/prompt-components.test.js test/screenshot.test.js test/thumbnails.test.js test/progress.test.js test/environment.test.js test/storage.test.js test/facade-properties.test.js test/dom-boundaries.test.js test/initialization.test.js test/entry.test.js test/accessibility-button.test.js test/accessibility-focus.test.js test/accessibility-slider.test.js",
     "test:coverage": "node --test test/coverage.test.js && node scripts/coverage.mjs",
     "test": "yarn test:node && yarn test:baseline",
     "test:browser": "playwright test",
@@ -73,7 +73,8 @@
     "test:ambilight": "node --test test/ambilight.test.js test/ambilight-lifecycle.test.js test/ambilight-proxy.test.js",
     "test:ambilight-types-package": "node refactor/scripts/ambilight-package-types.mjs",
     "test:canvas": "node --test test/canvas.test.js test/canvas-lifecycle.test.js",
-    "test:canvas-types-package": "node refactor/scripts/canvas-package-types.mjs"
+    "test:canvas-types-package": "node refactor/scripts/canvas-package-types.mjs",
+    "test:dpip": "node --test test/dpip.test.js"
   },
   "browserslist": "last 1 Chrome version",
   "devDependencies": {
diff --git a/refactor/baselines/dpip-behavior-validation.json b/refactor/baselines/dpip-behavior-validation.json
new file mode 100644
index 000000000..5bcc4afb3
--- /dev/null
+++ b/refactor/baselines/dpip-behavior-validation.json
@@ -0,0 +1,136 @@
+{
+  "schemaVersion": 1,
+  "task": "PKG-DPIP-02",
+  "status": "done",
+  "checks": [
+    {
+      "command": "node --test test/dpip.test.js refactor/scripts/dpip-contract.test.mjs",
+      "result": "pass",
+      "tests": 64,
+      "historicalLifecycle": 48,
+      "contract": 16
+    },
+    {
+      "command": "playwright test test/browser/dpip.spec.js",
+      "result": "pass",
+      "tests": 48,
+      "skipped": 0,
+      "browsers": [
+        {
+          "project": "chromium",
+          "version": "153.0.8010.12",
+          "platform": "win32"
+        },
+        {
+          "project": "firefox",
+          "version": "155.0",
+          "platform": "win32"
+        },
+        {
+          "project": "webkit",
+          "version": "26.6",
+          "platform": "win32"
+        }
+      ],
+      "scope": "four frozen implementations x two actual cores x three engines x two real DOM iframe scenarios; explicit historical failures, not fixes or native Document PiP"
+    },
+    {
+      "command": "focused eslint --no-fix",
+      "result": "pass"
+    },
+    {
+      "command": "yarn ci:check",
+      "result": "pass",
+      "tests": {
+        "unit": 986,
+        "engineering": 14,
+        "baseline": 116,
+        "mainTotal": 1116,
+        "repeatedContractExecutions": 44
+      },
+      "strictProductionTypeScriptFiles": 284
+    }
+  ],
+  "limitations": [
+    "Historical failure assertions are reproductions, not candidate fixes.",
+    "Controlled Node host destroy does not model all core cleanup.",
+    "Real browser iframe DOM and events are used; requestWindow and close are controlled, not native Document PiP.",
+    "WebKit reports width640 for the 320-wide fixture in the styled player; preserved as a historical observation, not intrinsic-size acceptance.",
+    "Native window/user activation, media continuity, focus, proxies and devices remain task05."
+  ],
+  "parentCommit": "efbbdb4782be75d80c2f51e62e0eb8c5e98b83eb",
+  "inputs": [
+    {
+      "file": "test/dpip.test.js",
+      "sha256LF": "0f73444b07821642b6291bd24c10087708867b1fcac5e23b9c4a1d901904163c"
+    },
+    {
+      "file": "test/helpers/dpip.js",
+      "sha256LF": "93941787e7fd34a332eb46f47becb8a306f25871a511d9c83b792c04f8035131"
+    },
+    {
+      "file": "test/browser/dpip.spec.js",
+      "sha256LF": "0626ddd9ef96aab5d68f47496266708c5f4be8cd9c9f3984db371b1612b6921e"
+    },
+    {
+      "file": "refactor/baselines/dpip-release.json",
+      "sha256LF": "afcf54f22fb3f57186e19bdf384a130c6388e972164774ee56eeca23fc814c23"
+    },
+    {
+      "file": "packages/artplayer-plugin-document-pip/src/index.js",
+      "sha256LF": "655818d30d82e43443e9a7ea185f91fc951eb72ad11edaaed0264182e62f32ba"
+    },
+    {
+      "file": "package.json",
+      "sha256LF": "d7ee39161397f3e9121975b79592c84c65200ccf043d4449ac5b9a9fbb1a93f0"
+    }
+  ],
+  "logs": [
+    {
+      "file": "refactor/.cache/dpip02-node-first.log",
+      "sha256": "866a8985af2db6953dcb35cc8dc0405d99c3944075c264424ccd2703b09194d9"
+    },
+    {
+      "file": "refactor/.cache/dpip02-node-final.log",
+      "sha256": "946cce2d8663e4d06b969d6ba3f5463d074c6cb593d4fca0de1d0eca3402e5a9"
+    },
+    {
+      "file": "refactor/.cache/dpip02-lint-final.log",
+      "sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+    },
+    {
+      "file": "refactor/.cache/dpip02-browser-first.log",
+      "sha256": "dd4af0c08a2a33250f7b712074e3e13ae4775ab613972dc7f35ab35632bde20f"
+    },
+    {
+      "file": "refactor/.cache/dpip02-browser-final.log",
+      "sha256": "10556a704038d1e0052c59769443b14348a9e8d81cd8e72f0009ad807050df9b"
+    },
+    {
+      "file": "refactor/.cache/dpip02-browser-third.log",
+      "sha256": "cb5e301223d6b7ddb2b5dd4222e1e1cd45ee0f8403d66814f174de963a118e9b"
+    },
+    {
+      "file": "refactor/.cache/dpip02-ci.log",
+      "sha256": "0fe1f724a072ed13b802346e213a2ed638330f4a8bd55154d44b82b90008da26"
+    },
+    {
+      "file": "refactor/.cache/dpip02-first-results/report.json",
+      "sha256": "e1dca0e28bbdf0b537e15a71b846da64303d75b14084082f58db971b3c652f2a"
+    },
+    {
+      "file": "refactor/.cache/dpip02-second-results/report.json",
+      "sha256": "029b99b64c0463376c6dfd3a622d92e31c2de6608b3689d9b185864dca6e91ef"
+    },
+    {
+      "file": "refactor/.cache/dpip02-final-results/report.json",
+      "sha256": "7175394fe821285107950c846aad33acf01062d40036708d7d181742cdf20e00"
+    }
+  ],
+  "browserArtifacts": [
+    {
+      "file": "refactor/.cache/dpip02-final-results/results/.last-run.json",
+      "sha256": "91d1c43004802cd49950d78eb11c8fa7d05da8ffffe219a8b13b2f561bc00903"
+    }
+  ]
+}
diff --git a/refactor/changes/2026-09-12-PKG-DPIP-02-tests.md b/refactor/changes/2026-09-12-PKG-DPIP-02-tests.md
new file mode 100644
index 000000000..c7a5206e7
--- /dev/null
+++ b/refactor/changes/2026-09-12-PKG-DPIP-02-tests.md
@@ -0,0 +1,44 @@
+# PKG-DPIP-02 窗口竞争与还原失败
+
+本步只建立历史可重跑测试，不修改插件生产源码。三份实际可执行发布（1.0.1、
+1.0.2、1.1.0）和冻结工作区各12项，共48项；1.0.0缺运行时仍不加入行为矩阵。
+正常/错误对照包含请求拒绝后重试、pagehide/unload只关闭一次、不支持两种fallback、
+source替换保持节点身份及resize调用。明确复现的缺陷：
+
+- close或destroy发生在requestWindow完成前，迟到窗口仍接管播放器，逃逸open可重开。
+- 并发open覆盖还原目标，前一窗口/监听器/占位节点遗留，close把播放器还原到前一窗口。
+- open/close的sleep完成后仍在销毁实例发resize；激活事件里销毁同样未撤销后续效果。
+- adoption失败未回滚窗口与占位；占位节点被外部移动后，close先adopt再insert失败，
+  播放器成为无父节点，窗口仍active且关闭监听器已经移除。
+- 从其他document迁入的播放器可还原，但复制的样式来自全局document，遗漏原文档样式。
+- 1.1.0/冻结源码在DOMContentLoaded前重复执行会重复注入相同id；1.0.1/1.0.2的
+  Parcel模块缓存使相同bundle重复执行只有一份，不能把新版本缺陷写成全部版本都有。
+
+受控宿主的destroy只触发插件可见通知，不模拟核心全量回收，保留控件/监听器的断言
+只证明插件本身没有释放，不能据此声称实际核心destroy一定保留整个UI。
+
+浏览器矩阵为四实现×两实际核心（npm5.4.0/候选）×三引擎×两场景，共48项。
+使用原生iframe的document/adoptNode/insertBefore/Event，控制requestWindow和close；
+验证同一个player/video节点迁入与还原、媒体已加载、pagehide/unload、实际notice DOM，
+并明确断言历史pending-close和移动占位导致的失败状态。未伪装为原生文档PiP窗口，
+不证明用户激活、焦点/键盘、原生窗口关闭或跨窗连续播放。能力检测在替换API前记录。
+
+首次Node运行45/48通过：两份Parcel bundle重复执行缓存与预计不同，冻结源码重复
+eval遇到词法重声明。loader现在只加函数作用域隔离，不改执行代码；保留旧Parcel缓存
+的实际1节点断言。首次浏览器16/48通过：24项错误使用notice.show getter读文字，
+改为$noticeInner.textContent；另8项WebKit对320宽媒体返回640（当前CSS宽度），
+现以精确历史引擎差异记录，不能把其通过称为正确原生像素/内在尺寸通过。首次完整报告、
+trace和截图保留，尺寸原因及原生媒体连续性留05进一步对照。
+
+第二轮37/48通过：跨文档迁移后的原生媒体/resize事件会把notice改成Aspect Ratio，
+错误断言需要在close同步失败路径刚写入DOM时取证，不能稍后假定它永远不被覆盖。
+另外iframe默认300×150触发布局变化，WebKit读数也出现266；最终固定测试iframe为
+640×360并等待明确的640宽读数，保留其他引擎320宽对照，没有把任意正数作为通过。
+第二轮报告同样完整归档。该改动稳定DOM测试环境，不解决或解释原生媒体内在尺寸。
+
+结果见[验证证据](../baselines/dpip-behavior-validation.json)。03将分离窗口状态机、
+DOM迁移/样式、控件与事件资源，新增候选正向断言并保留本文件对应旧失败对照；
+04处理类型/导出，05继续原生窗口和代理/设备组合。本步测试失败可独立回退，
+不会修改已发布归档。不推送、发布或升级版本。
+
+最终64项Node定向检查（48生命周期+16正常契约）、48项浏览器和lint通过；完整CI1116项（986单元+14工程+116基线）通过，另44项重复契约观察。284生产TS文件严格检查。本步done并独立提交，已复现风险保持open，由03/05完成修复和原生验收。
diff --git a/refactor/dpip-validation.md b/refactor/dpip-validation.md
index 2b0d099d7..ea1f21d4b 100644
--- a/refactor/dpip-validation.md
+++ b/refactor/dpip-validation.md
@@ -21,3 +21,13 @@ test/helpers/dpip.js是受控DOM/window边界：验证ownerDocument、节点身
 
 证据入口：[01记录](changes/2026-09-12-PKG-DPIP-01-contract.md)、
 [01验证](baselines/dpip-contract-validation.json)。正常契约测试通过不关闭源码观察风险。
+
+## 生命周期历史复现（02）
+
+`yarn test:dpip`：48项（四实现×12组），覆盖拒绝/fallback、重复/迟到打开、close/destroy、
+延迟resize、激活重入、adoption失败、占位移动、跨文档样式、source节点身份及重复样式。
+`yarn test:browser test/browser/dpip.spec.js`：48项，四实现×两实际核心×三引擎×两场景。
+真实DOM用于迁移、还原与错误验证；窗口API受控，不能作为原生Document PiP验收。
+当前WebKit的640宽读数与320宽fixture不同，精确保留为历史观察，待05查清尺寸和媒体
+连续性；测试不会宽泛允许任意尺寸。初次错误与修正原因见[02记录](changes/2026-09-12-PKG-DPIP-02-tests.md)，
+验收状态见[02证据](baselines/dpip-behavior-validation.json)。03必须新增候选修复断言。
diff --git a/refactor/plan.md b/refactor/plan.md
index b42e77174..57f9443b9 100644
--- a/refactor/plan.md
+++ b/refactor/plan.md
@@ -4,7 +4,7 @@
 
 基线：`40fcda6a37d0049d42e49c1e64e70d4fd9ba5f7f`。总任务 221 项，范围 22 个包及工作区/示例。
 
-状态：todo 121 / doing 6 / blocked 0 / done 94 / deferred 0。风险 L/M/H 表示兼容风险，不表示工期。
+状态：todo 120 / doing 6 / blocked 0 / done 95 / deferred 0。风险 L/M/H 表示兼容风险，不表示工期。
 
 前置依赖是启动条件；验收是完成条件。任务可以继续拆分，但不能复用或悄悄删除旧 ID。
 
@@ -294,7 +294,7 @@
 | ID | 范围 / 步骤 | 前置依赖 | 交付物 | 验收条件 | 风险 | 状态 |
 | --- | --- | --- | --- | --- | --- | --- |
 | PKG-DPIP-01 | artplayer-plugin-document-pip<br>核对包契约与历史用法 | BASE-05 | width/height/placeholder/fallbackToVideoPiP、open/close/toggle 返回 | 源码/声明/README/demo/发布包差异已登记；公开形状和版本范围冻结 | H | done |
-| PKG-DPIP-02 | artplayer-plugin-document-pip<br>建立特有行为与错误测试 | PKG-DPIP-01, ENG-03, ENG-05 | 不支持/拒绝、重复打开、pagehide、核心销毁和视频 PiP fallback | 旧版本行为可重跑，成功/失败/切源/销毁有必要断言 | H | todo |
+| PKG-DPIP-02 | artplayer-plugin-document-pip<br>建立特有行为与错误测试 | PKG-DPIP-01, ENG-03, ENG-05 | 不支持/拒绝、重复打开、pagehide、核心销毁和视频 PiP fallback | 旧版本行为可重跑，成功/失败/切源/销毁有必要断言 | H | done |
 | PKG-DPIP-03 | artplayer-plugin-document-pip<br>整理内部职责与资源 | PKG-DPIP-02, CORE-16, CORE-17 | 窗口生命周期、DOM 迁移、样式与事件 document 重绑分离 | 结构变化和缺陷修复分开记录；原 API/事件/资源生命周期通过 | H | todo |
 | PKG-DPIP-04 | artplayer-plugin-document-pip<br>迁移自有源码和公开类型 | PKG-DPIP-03, ENG-04, ENG-06, CORE-07 | Document PiP 可选能力和真实状态/返回类型 | 严格类型检查、旧消费样例通过；声明路径/导出和同步异步兼容 | H | todo |
 | PKG-DPIP-05 | artplayer-plugin-document-pip<br>验证新旧核心和组合 | PKG-DPIP-04, CORE-22, PKG-CANVAS-04, PKG-MB-04 | 原生视频及两个 proxy、键盘/焦点/全屏与关闭还原 | 最终核心与原支持范围核心分别通过；设备/SDK 缺证据不能标完成 | H | todo |
@@ -507,6 +507,7 @@
 - PKG-VAST-02: [记录](changes/2026-09-12-PKG-VAST-02-tests.md) [记录](baselines/vast-behavior-validation.json) [记录](baselines/vast-core.json) [记录](vast-validation.md)
 - PKG-VAST-03: [记录](changes/2026-09-12-PKG-VAST-03-lifecycle.md) [记录](baselines/vast-lifecycle-validation.json) [记录](vast-compatibility-decision.md)
 - PKG-DPIP-01: [记录](changes/2026-09-12-PKG-DPIP-01-contract.md) [记录](baselines/dpip-release.json) [记录](baselines/dpip-contract.md) [记录](baselines/dpip-contract-validation.json) [记录](dpip-validation.md)
+- PKG-DPIP-02: [记录](changes/2026-09-12-PKG-DPIP-02-tests.md) [记录](baselines/dpip-behavior-validation.json) [记录](dpip-validation.md)
 - PKG-CANVAS-01: [记录](changes/2026-09-12-PKG-CANVAS-01-contract.md) [记录](baselines/canvas-contract.md) [记录](baselines/canvas-release.json) [记录](canvas-validation.md) [记录](baselines/canvas-contract-validation.json)
 - PKG-CANVAS-02: [记录](changes/2026-09-12-PKG-CANVAS-02-tests.md) [记录](baselines/canvas-behavior-validation.json) [记录](canvas-validation.md)
 - PKG-CANVAS-03: [记录](changes/2026-09-12-PKG-CANVAS-03-lifecycle.md) [记录](baselines/canvas-lifecycle-validation.json) [记录](canvas-validation.md)
diff --git a/refactor/progress.md b/refactor/progress.md
index abd218791..84792dae8 100644
--- a/refactor/progress.md
+++ b/refactor/progress.md
@@ -1,5 +1,15 @@
 # 进度与证据
 
+## 最新完成：Document PiP-02 生命周期历史复现
+
+四实现×12组共48项复现迟到/重复窗口、销毁后效果、DOM回滚失败和样式差异，
+另16项正常契约通过。三浏览器×两核心×四实现×两场景48项真实DOM iframe检查通过，
+其中历史缺陷断言通过不代表修复；原生窗口/用户激活/连续播放仍待05。
+完整CI1116项通过，另44项重复契约观察，284生产TS文件严格检查。
+当前221项：95 done、6 doing、120 todo。见[本步记录](changes/2026-09-12-PKG-DPIP-02-tests.md)
+和[验证证据](baselines/dpip-behavior-validation.json)。下一步03拆分TS状态与资源并修复，
+保留历史负例；每任务独立本地提交，不推送/发布。
+
 ## 最新完成：Document PiP-01 实际发布契约
 
 冻结四个npm归档/21成员及7个Git工作区输入。实际1.0.0缺少三个运行时入口，
diff --git a/refactor/risk-table.md b/refactor/risk-table.md
index 448c75e86..d80f99d69 100644
--- a/refactor/risk-table.md
+++ b/refactor/risk-table.md
@@ -162,5 +162,7 @@
 | DPIP-PACK-01 | open / 已复现 | Published Document PiP 1.0.0 tarball omits every declared runtime entry | PKG-DPIP-06 |
 | DPIP-DIST-01 | open / 已复现 | Document PiP namespace.default in 1.0.1/1.0.2 differs from callable 1.1.0 export | PKG-DPIP-04, PKG-DPIP-06 |
 | DPIP-TYPE-01 | open / 已复现 | Document PiP requires options and declares void actions and writable flags that differ from runtime | PKG-DPIP-04 |
-| DPIP-LIFE-01 | open / 源码/产物事实 | Document PiP has no separate ownership for pending window requests and delayed post-transition callbacks | PKG-DPIP-02, PKG-DPIP-03, PKG-DPIP-05 |
-| DPIP-DOM-01 | open / 源码/产物事实 | Document PiP copies global-document styles and retains original parent without transactional rollback | PKG-DPIP-02, PKG-DPIP-03, PKG-DPIP-05 |
+| DPIP-LIFE-01 | open / 已复现 | Document PiP has no separate ownership for pending window requests and delayed post-transition callbacks | PKG-DPIP-02, PKG-DPIP-03, PKG-DPIP-05 |
+| DPIP-DOM-01 | open / 已复现 | Document PiP copies global-document styles and retains original parent without transactional rollback | PKG-DPIP-02, PKG-DPIP-03, PKG-DPIP-05 |
+| DPIP-STYLE-01 | open / 已复现 | Document PiP 1.1.0 and frozen source duplicate style IDs when evaluated before DOMContentLoaded | PKG-DPIP-03 |
+| DPIP-MEDIA-01 | open / 已复现 | WebKit reports styled width640 for width320 media in the controlled Document PiP iframe matrix | PKG-DPIP-05 |
diff --git a/refactor/risks.json b/refactor/risks.json
index 3d3cb15c5..642a6419a 100644
--- a/refactor/risks.json
+++ b/refactor/risks.json
@@ -3486,7 +3486,7 @@
     {
       "id": "DPIP-LIFE-01",
       "title": "Document PiP has no separate ownership for pending window requests and delayed post-transition callbacks",
-      "confirmation": "source-observed",
+      "confirmation": "reproduced",
       "owners": [
         "PKG-DPIP-02",
         "PKG-DPIP-03",
@@ -3498,13 +3498,15 @@
       "evidence": [
         "refactor/baselines/dpip-release.json",
         "refactor/baselines/dpip-contract.md",
-        "refactor/changes/2026-09-12-PKG-DPIP-01-contract.md"
+        "refactor/changes/2026-09-12-PKG-DPIP-01-contract.md",
+        "refactor/changes/2026-09-12-PKG-DPIP-02-tests.md",
+        "refactor/baselines/dpip-behavior-validation.json"
       ]
     },
     {
       "id": "DPIP-DOM-01",
       "title": "Document PiP copies global-document styles and retains original parent without transactional rollback",
-      "confirmation": "source-observed",
+      "confirmation": "reproduced",
       "owners": [
         "PKG-DPIP-02",
         "PKG-DPIP-03",
@@ -3516,7 +3518,39 @@
       "evidence": [
         "refactor/baselines/dpip-release.json",
         "refactor/baselines/dpip-contract.md",
-        "refactor/changes/2026-09-12-PKG-DPIP-01-contract.md"
+        "refactor/changes/2026-09-12-PKG-DPIP-01-contract.md",
+        "refactor/changes/2026-09-12-PKG-DPIP-02-tests.md",
+        "refactor/baselines/dpip-behavior-validation.json"
+      ]
+    },
+    {
+      "id": "DPIP-STYLE-01",
+      "title": "Document PiP 1.1.0 and frozen source duplicate style IDs when evaluated before DOMContentLoaded",
+      "owners": [
+        "PKG-DPIP-03"
+      ],
+      "compatibleResolution": "Preserve the style id and injection timing while deduplicating at insertion and releasing loading listeners.",
+      "closureCriteria": "Historical two-node versus Parcel cached one-node difference stays explicit; candidate has one final style node under duplicate evaluation.",
+      "confirmation": "reproduced",
+      "status": "open",
+      "evidence": [
+        "refactor/changes/2026-09-12-PKG-DPIP-02-tests.md",
+        "refactor/baselines/dpip-behavior-validation.json"
+      ]
+    },
+    {
+      "id": "DPIP-MEDIA-01",
+      "title": "WebKit reports styled width640 for width320 media in the controlled Document PiP iframe matrix",
+      "owners": [
+        "PKG-DPIP-05"
+      ],
+      "compatibleResolution": "Use independent native media controls to determine the dimension behavior and verify real Document PiP playback and proxy dimensions.",
+      "closureCriteria": "Exact browser/version evidence distinguishes layout-driven reports from intrinsic pixels and validates native media continuity; do not treat controlled iframe success as native PiP acceptance.",
+      "confirmation": "reproduced",
+      "status": "open",
+      "evidence": [
+        "refactor/changes/2026-09-12-PKG-DPIP-02-tests.md",
+        "refactor/baselines/dpip-behavior-validation.json"
       ]
     }
   ]
diff --git a/refactor/tasks.json b/refactor/tasks.json
index 4c18c61f9..0bec1c66f 100644
--- a/refactor/tasks.json
+++ b/refactor/tasks.json
@@ -3009,11 +3009,15 @@
         "ENG-03",
         "ENG-05"
       ],
-      "status": "todo",
+      "status": "done",
       "risk": "H",
       "deliverable": "不支持/拒绝、重复打开、pagehide、核心销毁和视频 PiP fallback",
       "acceptance": "旧版本行为可重跑，成功/失败/切源/销毁有必要断言",
-      "evidence": []
+      "evidence": [
+        "changes/2026-09-12-PKG-DPIP-02-tests.md",
+        "baselines/dpip-behavior-validation.json",
+        "dpip-validation.md"
+      ]
     },
     {
       "id": "PKG-DPIP-03",
diff --git a/test/README.md b/test/README.md
index 4b5042550..e564222d1 100644
--- a/test/README.md
+++ b/test/README.md
@@ -54,3 +54,5 @@ These tests are separate from the fast Node suite and run in the Browser playbac
 formats with a controlled Audio object: timing intent, offsets, source updates, rejection,
 volume/rate, independent instances and cleanup. Published-only tests retain defect evidence.
 See [audio validation](../refactor/audio-validation.md) for actual media tests and limitations.
+
+Document PiP: `yarn test:dpip` runs 48 historical window/DOM/lifecycle cases. Native DOM iframe checks use `yarn test:browser test/browser/dpip.spec.js`; controlled window APIs do not establish native Document PiP support. See [validation notes](../refactor/dpip-validation.md).
diff --git a/test/browser/dpip.spec.js b/test/browser/dpip.spec.js
new file mode 100644
index 000000000..e5f30fbc6
--- /dev/null
+++ b/test/browser/dpip.spec.js
@@ -0,0 +1,90 @@
+import { hash } from '../../refactor/scripts/releases.mjs'
+import { dpipHistorical } from '../helpers/dpip.js'
+import { expect, test } from './fixtures.js'
+
+const implementations = await dpipHistorical()
+
+async function setup(page, core, implementation, testInfo) {
+  await page.goto(`/test/player.html?core=${core}`)
+  await page.evaluate(() => {
+    window.dpipEvidence = { nativeCapability: typeof window.documentPictureInPicture?.requestWindow === 'function', scope: 'real DOM iframe with controlled requestWindow; not native Document PiP', windows: [], requests: [], events: [] }
+    Object.defineProperty(window, 'documentPictureInPicture', { configurable: true, value: {
+      requestWindow(option) {
+        return new Promise((resolve) => {
+          window.dpipEvidence.requests.push({ option, resolve })
+        })
+      },
+    } })
+    window.resolveDpip = (index) => {
+      const frame = document.createElement('iframe')
+      frame.width = '640'
+      frame.height = '360'
+      frame.style.cssText = 'display:block;border:0;width:640px;height:360px'
+      document.body.appendChild(frame)
+      const popup = frame.contentWindow
+      const record = { frame, popup, closed: false }
+      Object.defineProperty(popup, 'close', { configurable: true, value: () => {
+        record.closed = true
+      } })
+      window.dpipEvidence.windows.push(record)
+      window.dpipEvidence.requests[index].resolve(popup)
+    }
+  })
+  await page.addScriptTag({ content: `(() => { const module = { exports: {} }; const exports = module.exports; ${implementation.code}; window.dpipFactory = module.exports.default || module.exports; })();` })
+  await page.evaluate(() => {
+    window.art = new window.Artplayer({ container: '.player', url: '/test/pattern.mp4', muted: true, plugins: [window.dpipFactory()] })
+    window.dpip = window.art.plugins.artplayerPluginDocumentPip
+    window.dpipPlayer = window.art.template.$player
+    window.dpipVideo = window.art.video
+    window.dpipParent = window.dpipPlayer.parentNode
+    window.art.on('document-pip', active => window.dpipEvidence.events.push(active))
+  })
+  await expect.poll(() => page.evaluate(() => window.art.video.readyState)).toBeGreaterThanOrEqual(2)
+  await testInfo.attach('dpip-input', { contentType: 'application/json', body: JSON.stringify({ implementation: implementation.name, sha256: hash(implementation.code), core, ...(await page.evaluate(() => ({ capability: window.dpipEvidence.nativeCapability, scope: window.dpipEvidence.scope }))) }) })
+}
+
+for (const implementation of implementations) {
+  for (const core of ['published', 'candidate']) {
+    test(`Document PiP ${implementation.name}/${core}: real DOM migration and pagehide restore preserve media and controls`, async ({ page }, testInfo) => {
+      await setup(page, core, implementation, testInfo)
+      await page.evaluate(() => {
+        window.dpipOpening = window.dpip.open()
+        window.resolveDpip(0)
+      })
+      await page.evaluate(() => window.dpipOpening)
+      await expect.poll(() => page.evaluate(() => window.dpipVideo.videoWidth)).toBe(testInfo.project.name === 'webkit' ? 640 : 320)
+      expect(await page.evaluate(() => ({ active: window.dpip.isActive, adopted: window.dpipPlayer.ownerDocument === window.dpipEvidence.windows[0].popup.document, videoIdentity: window.dpipVideo === window.art.video, placeholder: window.dpipParent.querySelectorAll('.artplayer-document-pip-placeholder').length, width: window.dpipVideo.videoWidth }))).toEqual({ active: true, adopted: true, videoIdentity: true, placeholder: 1, width: testInfo.project.name === 'webkit' ? 640 : 320 })
+      await page.evaluate(() => {
+        const popup = window.dpipEvidence.windows[0].popup
+        popup.dispatchEvent(new popup.Event('pagehide'))
+        popup.dispatchEvent(new popup.Event('unload'))
+      })
+      await expect.poll(() => page.evaluate(() => window.dpip.isActive)).toBe(false)
+      expect(await page.evaluate(() => ({ restored: window.dpipPlayer.parentNode === window.dpipParent && window.dpipPlayer.ownerDocument === document, videoIdentity: window.art.video === window.dpipVideo, placeholders: document.querySelectorAll('.artplayer-document-pip-placeholder').length, closed: window.dpipEvidence.windows[0].closed, events: window.dpipEvidence.events }))).toEqual({ restored: true, videoIdentity: true, placeholders: 0, closed: true, events: [true, false] })
+      await page.evaluate(() => window.art.destroy())
+    })
+
+    test(`Document PiP ${implementation.name}/${core}: historical pending close and moved placeholder fail in real DOM`, async ({ page }, testInfo) => {
+      await setup(page, core, implementation, testInfo)
+      await page.evaluate(async () => {
+        window.dpipOpening = window.dpip.open()
+        await window.dpip.close()
+        window.resolveDpip(0)
+        await window.dpipOpening
+      })
+      expect(await page.evaluate(() => window.dpip.isActive)).toBe(true)
+      await page.evaluate(async () => {
+        document.body.appendChild(document.querySelector('.artplayer-document-pip-placeholder'))
+        const closing = window.dpip.close()
+        window.dpipFailureSnapshot = { active: window.dpip.isActive, detached: window.dpipPlayer.parentNode === null, closed: window.dpipEvidence.windows[0].closed, notice: window.art.template.$noticeInner.textContent }
+        await closing
+      })
+      expect(await page.evaluate(() => window.dpipFailureSnapshot)).toEqual({ active: true, detached: true, closed: false, notice: 'Document Picture-in-Picture close failed' })
+      await page.evaluate(async () => {
+        window.dpipParent.appendChild(document.querySelector('.artplayer-document-pip-placeholder'))
+        await window.dpip.close()
+        window.art.destroy()
+      })
+    })
+  }
+}
diff --git a/test/dpip.test.js b/test/dpip.test.js
new file mode 100644
index 000000000..5b6b061f2
--- /dev/null
+++ b/test/dpip.test.js
@@ -0,0 +1,227 @@
+import assert from 'node:assert/strict'
+// eslint-disable-next-line test/no-import-node-test -- Frozen historical failures remain separate from candidate regression tests.
+import test from 'node:test'
+import { dpipEnvironment, dpipHistorical } from './helpers/dpip.js'
+
+function deferred() {
+  let resolve
+  let reject
+  const promise = new Promise((yes, no) => {
+    resolve = yes
+    reject = no
+  })
+  return { promise, resolve, reject }
+}
+
+for (const implementation of await dpipHistorical()) {
+  const label = implementation.name
+
+  test(`Document PiP ${label}: rejection retains notice and node identity; retry and pagehide restore once`, async () => {
+    let reject = true
+    const error = new Error('request denied')
+    const env = dpipEnvironment(implementation, { requestWindow: (_, create) => reject ? Promise.reject(error) : Promise.resolve(create()) })
+    const result = env.factory()(env.art)
+    assert.equal(await result.open(), undefined)
+    assert.equal(result.isActive, false)
+    assert.equal(env.player.parentNode, env.parent)
+    assert.equal(env.warnings[0][1], error)
+    assert.match(env.art.notice.show, /open failed/)
+    reject = false
+    await result.open()
+    const win = env.windows[0]
+    win.dispatchEvent({ type: 'pagehide' })
+    win.dispatchEvent({ type: 'unload' })
+    await env.flush()
+    assert.equal(result.isActive, false)
+    assert.equal(win.closed, true)
+    assert.deepEqual(env.parent.children, [env.player, env.sibling])
+    assert.deepEqual(env.emitted.filter(event => event.name === 'document-pip').map(event => event.args[0]), [true, false])
+    assert.equal([...win.listeners.values()].reduce((sum, set) => sum + set.size, 0), 0)
+  })
+
+  test(`Document PiP ${label}: disabled fallback reports an open failure and throwing video fallback rejects unchanged`, async () => {
+    const env = dpipEnvironment(implementation, { supported: false })
+    const result = env.factory({ fallbackToVideoPiP: false })(env.art)
+    await result.open()
+    assert.equal(env.art.pip, false)
+    assert.match(env.art.notice.show, /open failed/)
+    assert.equal(env.requests.length, 0)
+    const fallback = dpipEnvironment(implementation, { supported: false })
+    const error = new Error('video PiP denied')
+    Object.defineProperty(fallback.art, 'pip', { get() {
+      return false
+    }, set() {
+      throw error
+    } })
+    await assert.rejects(fallback.factory()(fallback.art).open(), value => value === error)
+    assert.equal(fallback.warnings.length, 0)
+  })
+
+  test(`Document PiP ${label}: close cannot cancel a pending request and late resolution reopens`, async () => {
+    const pending = deferred()
+    const env = dpipEnvironment(implementation, { requestWindow: () => pending.promise })
+    const result = env.factory()(env.art)
+    const opening = result.open()
+    await result.close()
+    assert.equal(result.isActive, false)
+    pending.resolve(env.createWindow())
+    await opening
+    assert.equal(result.isActive, true, 'Historical defect: close lost to pending open')
+    assert.notEqual(env.player.ownerDocument, env.document)
+    await result.close()
+  })
+
+  test(`Document PiP ${label}: destroy does not revoke pending requests or escaped open methods`, async () => {
+    const pending = deferred()
+    const env = dpipEnvironment(implementation, { requestWindow: () => pending.promise })
+    const result = env.factory()(env.art)
+    const opening = result.open()
+    env.art.destroy()
+    pending.resolve(env.createWindow())
+    await opening
+    assert.equal(env.art.isDestroy, true)
+    assert.equal(result.isActive, true, 'Historical defect: late window takes a destroyed player')
+    await result.close()
+    await result.open()
+    assert.equal(env.requests.length, 2, 'Historical escaped method starts another request')
+    assert.equal(result.isActive, true)
+    await result.close()
+  })
+
+  test(`Document PiP ${label}: concurrent opens leak the first window and restore into that window`, async () => {
+    const first = deferred()
+    const second = deferred()
+    let request = 0
+    const env = dpipEnvironment(implementation, { requestWindow: () => request++ === 0 ? first.promise : second.promise })
+    const result = env.factory()(env.art)
+    const a = result.open()
+    const b = result.open()
+    const firstWindow = env.createWindow()
+    const secondWindow = env.createWindow()
+    first.resolve(firstWindow)
+    await a
+    second.resolve(secondWindow)
+    await b
+    assert.equal(env.requests.length, 2)
+    await result.close()
+    assert.equal(result.isActive, false)
+    assert.equal(firstWindow.closed, false)
+    assert.equal(secondWindow.closed, true)
+    assert.equal(env.player.ownerDocument, firstWindow.document, 'Historical restore target was overwritten by the second open')
+    assert.equal(firstWindow.listeners.get('pagehide').size, 1)
+    assert.equal(env.parent.children[0].className, 'artplayer-document-pip-placeholder')
+  })
+
+  test(`Document PiP ${label}: delayed open and close resize effects survive terminal destroy`, async () => {
+    const delays = []
+    const env = dpipEnvironment(implementation, { sleep: () => {
+      const pending = deferred()
+      delays.push(pending)
+      return pending.promise
+    } })
+    const result = env.factory()(env.art)
+    const opening = result.open()
+    await env.flush()
+    assert.equal(delays.length, 1)
+    env.art.destroy()
+    assert.equal(delays.length, 2)
+    const before = env.emitted.length
+    for (const delay of delays) delay.resolve()
+    await opening
+    await env.flush()
+    assert.deepEqual(env.emitted.slice(before).map(event => event.name), ['resize', 'resize'])
+    assert.equal(result.isActive, false)
+  })
+
+  test(`Document PiP ${label}: destroy during activation leaves a later resize and retained plugin subscriptions`, async () => {
+    const env = dpipEnvironment(implementation)
+    const result = env.factory()(env.art)
+    env.art.on('document-pip', (active) => {
+      if (active)
+        env.art.destroy()
+    })
+    await result.open()
+    await env.flush()
+    assert.equal(result.isActive, false)
+    assert.equal(env.controls.has('document-pip'), true)
+    assert.equal(env.subscriptions.get('destroy').size, 1)
+    assert.equal(env.controls.get('document-pip').node.listeners.get('click').size, 1)
+    assert.equal(env.emitted.filter(event => event.name === 'resize').length, 2)
+  })
+
+  test(`Document PiP ${label}: failed adoption retains active window and placeholder until explicit close`, async () => {
+    const env = dpipEnvironment(implementation, { requestWindow: (_, create) => {
+      const win = create()
+      win.document.adoptNode = () => {
+        throw new Error('adoption refused')
+      }
+      return Promise.resolve(win)
+    } })
+    const result = env.factory()(env.art)
+    await result.open()
+    assert.equal(result.isActive, true)
+    assert.equal(env.windows[0].closed, false)
+    assert.equal(env.parent.children.length, 3)
+    assert.match(env.art.notice.show, /open failed/)
+    await result.close()
+    assert.deepEqual(env.parent.children, [env.player, env.sibling])
+  })
+
+  test(`Document PiP ${label}: moving the placeholder makes restoration detach the player and retain the window`, async () => {
+    const env = dpipEnvironment(implementation)
+    const result = env.factory()(env.art)
+    await result.open()
+    const placeholder = env.parent.children[0]
+    const alternate = env.document.createElement('section')
+    env.document.body.appendChild(alternate)
+    alternate.appendChild(placeholder)
+    await result.close()
+    assert.match(env.art.notice.show, /close failed/)
+    assert.equal(result.isActive, true)
+    assert.equal(env.windows[0].closed, false)
+    assert.equal(env.player.parentNode, null)
+    assert.equal(env.windows[0].listeners.get('pagehide').size, 0)
+  })
+
+  test(`Document PiP ${label}: foreign ownerDocument styles are omitted while node restoration still works`, async () => {
+    const env = dpipEnvironment(implementation)
+    const foreign = env.createWindow().document
+    const foreignStyle = foreign.createElement('style')
+    foreignStyle.textContent = '.foreign { color: red }'
+    foreign.head.appendChild(foreignStyle)
+    foreign.body.appendChild(env.parent)
+    const result = env.factory()(env.art)
+    await result.open()
+    const win = env.windows[1]
+    assert.equal(win.document.querySelectorAll('style').some(style => style.textContent === foreignStyle.textContent), false)
+    await result.close()
+    assert.equal(env.player.ownerDocument, foreign)
+    assert.deepEqual(env.parent.children, [env.player, env.sibling])
+  })
+
+  test(`Document PiP ${label}: source replacement keeps player identity and popup resize calls the current method`, async () => {
+    const env = dpipEnvironment(implementation)
+    const video = env.document.createElement('video')
+    env.player.appendChild(video)
+    const result = env.factory()(env.art)
+    await result.open()
+    let resized = 0
+    env.art.resize = () => resized++
+    video.src = 'second.mp4'
+    env.art.emit('restart', video.src)
+    env.windows[0].dispatchEvent({ type: 'resize' })
+    assert.equal(resized, 1)
+    await result.close()
+    assert.equal(env.player.children[0], video)
+    assert.equal(video.src, 'second.mp4')
+    assert.equal(video.ownerDocument, env.document)
+  })
+
+  test(`Document PiP ${label}: duplicate evaluation preserves Parcel caching versus newer duplicate style injection`, () => {
+    const env = dpipEnvironment(implementation, { readyState: 'loading' })
+    env.evaluate()
+    env.document.dispatchEvent({ type: 'DOMContentLoaded' })
+    const parcelCached = ['published-1.0.1', 'published-1.0.2'].includes(label)
+    assert.equal(env.document.querySelectorAll('style').filter(style => style.id === 'artplayer-plugin-document-pip').length, parcelCached ? 1 : 2)
+  })
+}
diff --git a/test/helpers/dpip.js b/test/helpers/dpip.js
index a11bdb563..9f570e73d 100644
--- a/test/helpers/dpip.js
+++ b/test/helpers/dpip.js
@@ -188,7 +188,7 @@ export function dpipEnvironment(implementation, settings = {}) {
   }
   const context = vm.createContext({ window, document, console: { warn: (...args) => warnings.push(args) }, module: { exports: {} } })
   context.exports = context.module.exports
-  const evaluate = () => vm.runInContext(implementation.code, context, { timeout: 5000 })
+  const evaluate = () => vm.runInContext(`(() => { ${implementation.code}\n })()`, context, { timeout: 5000 })
   evaluate()
   return {
     factory: context.module.exports.default || context.module.exports,