From 63c8938dd768539cba701a6ef171c17ddd877955 Mon Sep 17 00:00:00 2001
From: Harvey Zhao <laozhaochaguan@gmail.com>
Date: Sat, 12 Sep 2026 17:12:59 +0800
Subject: [PATCH] test(mediabunny): [PKG-MB-02] checkpoint native playback and
 late load failures

---
 refactor/baselines/mb-media-checkpoint.json   | 713 ++++++++++++++++++
 .../2026-09-12-PKG-MB-02-checkpoint.md        |  38 +
 refactor/plan.md                              |   5 +-
 refactor/progress.md                          |   8 +
 refactor/risk-table.md                        |   3 +-
 refactor/risks.json                           |  24 +-
 refactor/tasks.json                           |   8 +-
 test/browser/mediabunny.spec.js               |  72 ++
 test/helpers/mediabunny.js                    |   4 +-
 test/mediabunny.test.js                       |  43 ++
 10 files changed, 908 insertions(+), 10 deletions(-)
 create mode 100644 refactor/baselines/mb-media-checkpoint.json
 create mode 100644 refactor/changes/2026-09-12-PKG-MB-02-checkpoint.md
 create mode 100644 test/browser/mediabunny.spec.js
 create mode 100644 test/mediabunny.test.js

diff --git a/refactor/baselines/mb-media-checkpoint.json b/refactor/baselines/mb-media-checkpoint.json
new file mode 100644
index 000000000..42581eabd
--- /dev/null
+++ b/refactor/baselines/mb-media-checkpoint.json
@@ -0,0 +1,713 @@
+{
+  "task": "PKG-MB-02",
+  "status": "doing",
+  "parentCommit": "1cfd2e17f319749ba5f2e73f4c54c21d858e9d7e",
+  "node": {
+    "tests": 22,
+    "historicalFailuresReproduced": 3,
+    "scope": "19 existing contracts plus actual historical load/destroy with controlled pending performLoad and timers. Does not model full core destroy or real decode."
+  },
+  "browser": {
+    "report": "refactor/.cache/mb02-first-results/report.json",
+    "results": "refactor/.cache/mb02-first-results/results",
+    "tests": 6,
+    "nativePlaybackSuccesses": 4,
+    "verifiedCapabilityFailures": 2,
+    "skipped": 0,
+    "records": [
+      {
+        "project": "chromium",
+        "browser": "153.0.8010.12",
+        "platform": "win32",
+        "implementation": "published-1.2.0",
+        "sha256": "7d088c0abe2f3c1e2857cb0547405ce1e5588630f28e484a64211fc675322bbd",
+        "capabilities": {
+          "secure": true,
+          "VideoDecoder": "function",
+          "AudioDecoder": "function",
+          "AudioContext": "function",
+          "webkitAudioContext": "undefined",
+          "coreVersion": "5.4.0"
+        },
+        "outcome": "native-mp4-playback-observed",
+        "state": {
+          "events": [
+            {
+              "name": "waiting",
+              "time": 97.90000000596046,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 98,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "waiting",
+              "time": 98.09999999403954,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 98.09999999403954,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadedmetadata",
+              "time": 157.80000001192093,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "durationchange",
+              "time": 157.80000001192093,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "progress",
+              "time": 157.90000000596046,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "loadeddata",
+              "time": 171.09999999403954,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplay",
+              "time": 171.09999999403954,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplaythrough",
+              "time": 171.09999999403954,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "progress",
+              "time": 171.09999999403954,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "play",
+              "time": 256.30000001192093,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "playing",
+              "time": 256.30000001192093,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 265.90000000596046,
+              "currentTime": 0.010666666666666665,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 531,
+              "currentTime": 0.28,
+              "readyState": 4
+            },
+            {
+              "name": "pause",
+              "time": 655.3000000119209,
+              "currentTime": 0.4,
+              "readyState": 4
+            }
+          ],
+          "actions": [],
+          "ready": true,
+          "dimensions": [
+            320,
+            180,
+            320,
+            180
+          ],
+          "paused": true,
+          "currentTime": 0.4,
+          "error": null,
+          "readyState": 4,
+          "audioState": "running"
+        },
+        "scope": "Two actual published proxies with actual core5.4.0; native MP4 pixels/clock or explicitly unsupported Windows WebKit APIs. No candidate, HLS or AV-sync acceptance."
+      },
+      {
+        "project": "chromium",
+        "browser": "153.0.8010.12",
+        "platform": "win32",
+        "implementation": "published-1.0.0",
+        "sha256": "7331465d8c7a6575505b9d3fd45986c5d3d9cb3839b2620ad5a52c581199562b",
+        "capabilities": {
+          "secure": true,
+          "VideoDecoder": "function",
+          "AudioDecoder": "function",
+          "AudioContext": "function",
+          "webkitAudioContext": "undefined",
+          "coreVersion": "5.4.0"
+        },
+        "outcome": "native-mp4-playback-observed",
+        "state": {
+          "events": [
+            {
+              "name": "waiting",
+              "time": 103.19999998807907,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 103.39999997615814,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "waiting",
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+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 103.39999997615814,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadedmetadata",
+              "time": 167.39999997615814,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "durationchange",
+              "time": 167.39999997615814,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "progress",
+              "time": 167.39999997615814,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "loadeddata",
+              "time": 176.39999997615814,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "loadeddata",
+              "time": 176.39999997615814,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplay",
+              "time": 176.5,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplaythrough",
+              "time": 176.5,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "progress",
+              "time": 176.5,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "play",
+              "time": 260.7999999821186,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "playing",
+              "time": 260.89999997615814,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 270.2999999821186,
+              "currentTime": 0.010666666666666665,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 536,
+              "currentTime": 0.2693333333333333,
+              "readyState": 4
+            },
+            {
+              "name": "pause",
+              "time": 661.0999999940395,
+              "currentTime": 0.4,
+              "readyState": 4
+            }
+          ],
+          "actions": [],
+          "ready": true,
+          "dimensions": [
+            320,
+            180,
+            320,
+            180
+          ],
+          "paused": true,
+          "currentTime": 0.4,
+          "error": null,
+          "readyState": 4,
+          "audioState": "running"
+        },
+        "scope": "Two actual published proxies with actual core5.4.0; native MP4 pixels/clock or explicitly unsupported Windows WebKit APIs. No candidate, HLS or AV-sync acceptance."
+      },
+      {
+        "project": "firefox",
+        "browser": "155.0",
+        "platform": "win32",
+        "implementation": "published-1.2.0",
+        "sha256": "7d088c0abe2f3c1e2857cb0547405ce1e5588630f28e484a64211fc675322bbd",
+        "capabilities": {
+          "secure": true,
+          "VideoDecoder": "function",
+          "AudioDecoder": "function",
+          "AudioContext": "function",
+          "webkitAudioContext": "undefined",
+          "coreVersion": "5.4.0"
+        },
+        "outcome": "native-mp4-playback-observed",
+        "state": {
+          "events": [
+            {
+              "name": "waiting",
+              "time": 408,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 408,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "waiting",
+              "time": 408,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 408,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadedmetadata",
+              "time": 432,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "durationchange",
+              "time": 432,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "progress",
+              "time": 432,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "loadeddata",
+              "time": 448,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplay",
+              "time": 449,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplaythrough",
+              "time": 449,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "progress",
+              "time": 449,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "play",
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+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "playing",
+              "time": 606,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 613,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 862,
+              "currentTime": 0.2506666666666667,
+              "readyState": 4
+            },
+            {
+              "name": "pause",
+              "time": 1017,
+              "currentTime": 0.41066666666666674,
+              "readyState": 4
+            }
+          ],
+          "actions": [],
+          "ready": true,
+          "dimensions": [
+            320,
+            180,
+            320,
+            180
+          ],
+          "paused": true,
+          "currentTime": 0.41066666666666674,
+          "error": null,
+          "readyState": 4,
+          "audioState": "running"
+        },
+        "scope": "Two actual published proxies with actual core5.4.0; native MP4 pixels/clock or explicitly unsupported Windows WebKit APIs. No candidate, HLS or AV-sync acceptance."
+      },
+      {
+        "project": "firefox",
+        "browser": "155.0",
+        "platform": "win32",
+        "implementation": "published-1.0.0",
+        "sha256": "7331465d8c7a6575505b9d3fd45986c5d3d9cb3839b2620ad5a52c581199562b",
+        "capabilities": {
+          "secure": true,
+          "VideoDecoder": "function",
+          "AudioDecoder": "function",
+          "AudioContext": "function",
+          "webkitAudioContext": "undefined",
+          "coreVersion": "5.4.0"
+        },
+        "outcome": "native-mp4-playback-observed",
+        "state": {
+          "events": [
+            {
+              "name": "waiting",
+              "time": 339,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 339,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "waiting",
+              "time": 339,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 339,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadedmetadata",
+              "time": 369,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "durationchange",
+              "time": 369,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "progress",
+              "time": 369,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "loadeddata",
+              "time": 384,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "loadeddata",
+              "time": 385,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplay",
+              "time": 385,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "canplaythrough",
+              "time": 385,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "progress",
+              "time": 385,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "play",
+              "time": 535,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "playing",
+              "time": 535,
+              "currentTime": 0,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 542,
+              "currentTime": 0.010666666666666658,
+              "readyState": 4
+            },
+            {
+              "name": "timeupdate",
+              "time": 808,
+              "currentTime": 0.28,
+              "readyState": 4
+            },
+            {
+              "name": "pause",
+              "time": 937,
+              "currentTime": 0.41066666666666674,
+              "readyState": 4
+            }
+          ],
+          "actions": [],
+          "ready": true,
+          "dimensions": [
+            320,
+            180,
+            320,
+            180
+          ],
+          "paused": true,
+          "currentTime": 0.41066666666666674,
+          "error": null,
+          "readyState": 4,
+          "audioState": "running"
+        },
+        "scope": "Two actual published proxies with actual core5.4.0; native MP4 pixels/clock or explicitly unsupported Windows WebKit APIs. No candidate, HLS or AV-sync acceptance."
+      },
+      {
+        "project": "webkit",
+        "browser": "26.6",
+        "platform": "win32",
+        "implementation": "published-1.2.0",
+        "sha256": "7d088c0abe2f3c1e2857cb0547405ce1e5588630f28e484a64211fc675322bbd",
+        "capabilities": {
+          "secure": true,
+          "VideoDecoder": "undefined",
+          "AudioDecoder": "undefined",
+          "AudioContext": "undefined",
+          "webkitAudioContext": "undefined",
+          "coreVersion": "5.4.0"
+        },
+        "outcome": "verified-unsupported-capability-control",
+        "state": {
+          "events": [
+            {
+              "name": "waiting",
+              "time": 158,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 158,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "waiting",
+              "time": 165,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 165,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "error",
+              "time": 229,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadedmetadata",
+              "time": 232,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "durationchange",
+              "time": 232,
+              "currentTime": 0,
+              "readyState": 1
+            },
+            {
+              "name": "progress",
+              "time": 232,
+              "currentTime": 0,
+              "readyState": 1
+            }
+          ],
+          "actions": [],
+          "ready": false,
+          "dimensions": [
+            0,
+            0,
+            0,
+            0
+          ],
+          "paused": true,
+          "currentTime": 0,
+          "error": {
+            "code": 4,
+            "message": "undefined is not a constructor (evaluating 'new t')"
+          },
+          "readyState": 1
+        },
+        "scope": "Two actual published proxies with actual core5.4.0; native MP4 pixels/clock or explicitly unsupported Windows WebKit APIs. No candidate, HLS or AV-sync acceptance."
+      },
+      {
+        "project": "webkit",
+        "browser": "26.6",
+        "platform": "win32",
+        "implementation": "published-1.0.0",
+        "sha256": "7331465d8c7a6575505b9d3fd45986c5d3d9cb3839b2620ad5a52c581199562b",
+        "capabilities": {
+          "secure": true,
+          "VideoDecoder": "undefined",
+          "AudioDecoder": "undefined",
+          "AudioContext": "undefined",
+          "webkitAudioContext": "undefined",
+          "coreVersion": "5.4.0"
+        },
+        "outcome": "verified-unsupported-capability-control",
+        "state": {
+          "events": [
+            {
+              "name": "waiting",
+              "time": 149,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 149,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "waiting",
+              "time": 151,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "loadstart",
+              "time": 151,
+              "currentTime": 0,
+              "readyState": 0
+            },
+            {
+              "name": "error",
+              "time": 200,
+              "currentTime": 0,
+              "readyState": 0
+            }
+          ],
+          "actions": [],
+          "ready": false,
+          "dimensions": [
+            0,
+            0,
+            0,
+            0
+          ],
+          "paused": true,
+          "currentTime": 0,
+          "error": {
+            "code": 4,
+            "message": "undefined is not a constructor (evaluating 'new t')"
+          },
+          "readyState": 0
+        },
+        "scope": "Two actual published proxies with actual core5.4.0; native MP4 pixels/clock or explicitly unsupported Windows WebKit APIs. No candidate, HLS or AV-sync acceptance."
+      }
+    ]
+  },
+  "fixtureSha256": {
+    "test/browser/mediabunny.spec.js": "0d9af2fc2c47a9a78953e8c1fd69148ba553dc3b5e3f5ff0c141f537597ae9fe",
+    "test/mediabunny.test.js": "bc740a32d88cfb1291785d6ba20737d1e53276e9d43a3fc99ecc5423e5fa6a77",
+    "test/helpers/mediabunny.js": "3e25bd5274d58be4d0bb85cd5fb2a825848cae1bfdbfaf5c91177a0c2b03a87a"
+  },
+  "limitations": [
+    "No full CI rerun claimed for this checkpoint; MB-01 CI evidence belongs to its preceding completion commit.",
+    "WebM/HLS/Blob/Stream, seek and exact readiness/AV-sync/cleanup coverage still pending.",
+    "Windows WebKit missing APIs is an explicit negative control, not successful playback or a general Safari support verdict.",
+    "Candidate code has not yet been migrated or fixed."
+  ]
+}
diff --git a/refactor/changes/2026-09-12-PKG-MB-02-checkpoint.md b/refactor/changes/2026-09-12-PKG-MB-02-checkpoint.md
new file mode 100644
index 000000000..71104be8c
--- /dev/null
+++ b/refactor/changes/2026-09-12-PKG-MB-02-checkpoint.md
@@ -0,0 +1,38 @@
+# PKG-MB-02 首批媒体与销毁负例检查点
+
+本任务进行中，不计为完成。MB-01完成提交为1cfd2e17，完整CI1161项属于该提交；
+本检查点新增测试按影响范围执行22项Node（19基线+3历史缺陷）及6项浏览器，不将旧CI计为本步完整CI。
+
+## 已复现的历史缺陷
+
+两份真实npm主产物及冻结工作区均使用实际engine.load/destroy，替换performLoad为受控未完成请求。
+destroy没有推进loadSeq，waiting/loadstart两个timer继续保留；晚到失败先发error并写networkState=3，
+之后仍能执行waiting/loadstart。三个精确负例通过；它们证明旧问题存在，不代表候选已修复。
+宿主为受控ArtPlayer事件对象，不能据此断言完整核心销毁后外部监听器仍收到事件。
+
+## 真实浏览器结果
+
+实际npm核心5.4.0 × proxy 1.0.0/1.2.0 × 三引擎，共6项：
+
+- Chromium、Firefox的4项：真实MP4加载，播放时钟>0.15秒，320×180 Canvas，红/蓝采样像素及alpha，暂停状态通过。
+- 当前Windows WebKit的2项：VideoDecoder、AudioDecoder、AudioContext和webkitAudioContext均不存在；
+  实际旧proxy出现code=4和构造器错误、未ready、尺寸0。测试验证此精确能力失败，没有skip，
+  但不能把这两项称为播放通过，不能扩大为所有Safari不支持。
+- 所有项保留实际proxy字节哈希、核心资源manifest、浏览器版本/平台、媒体状态/事件、页面错误和请求诊断。
+
+第一次探索等待ready时使用了Playwright默认30秒超时，保留6个截图与trace；正式测试已使用
+expect.poll和明确的能力失败断言，不再靠超时或catch任意错误判通过。
+正式报告与整个results目录归档于`.cache/mb02-first-results`；探索报告位于`.cache/mb02-native-probe-3ZcV99`。
+
+## 复跑与剩余范围
+
+```sh
+node --test test/mediabunny.test.js refactor/scripts/mb-contract.test.mjs
+yarn test:browser test/browser/mediabunny.spec.js
+```
+
+还缺：WebM、HLS、Blob/Stream、真实seek、无音轨/无视频/无轨道、超时和取消、并发选轨与
+就绪事件次数、音画同步及资源释放。原生DPiP、长播放、新旧核心完整组合留MB-09。
+MPL来源/通知仍MB-10，Canvas/Ambilight类型取舍仍未决定。
+
+实现和用例影响由[机器记录](../baselines/mb-media-checkpoint.json)描述，当前PKG-MB-02保持doing。
diff --git a/refactor/plan.md b/refactor/plan.md
index efb4c31bb..d4bb1a00b 100644
--- a/refactor/plan.md
+++ b/refactor/plan.md
@@ -4,7 +4,7 @@
 
 基线：`40fcda6a37d0049d42e49c1e64e70d4fd9ba5f7f`。总任务 222 项，范围 22 个包及工作区/示例。
 
-状态：todo 117 / doing 7 / blocked 0 / done 98 / deferred 0。风险 L/M/H 表示兼容风险，不表示工期。
+状态：todo 116 / doing 8 / blocked 0 / done 98 / 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。
 
@@ -330,7 +330,7 @@
 | ID | 范围 / 步骤 | 前置依赖 | 交付物 | 验收条件 | 风险 | 状态 |
 | --- | --- | --- | --- | --- | --- | --- |
 | PKG-MB-01 | artplayer-proxy-mediabunny<br>核对 shim 与媒体契约 | BASE-05 | 全部 option、art.mediabunny、canvas/shim 属性及事件表 | 公开暴露成员和实际发布依赖/资源范围明确；核实 third-party.json 所记录依赖 MPL-2.0 元数据与实际 bundle 的许可/通知范围，不从根 MIT 推断 | H | done |
-| PKG-MB-02 | artplayer-proxy-mediabunny<br>建立真实媒体与事件基线 | PKG-MB-01, ENG-05, ENG-08 | MP4/WebM/HLS/Blob/Stream、seek/错误/轨道切换样本 | ready 事件顺序、音画同步、超时和释放可重跑 | H | todo |
+| PKG-MB-02 | artplayer-proxy-mediabunny<br>建立真实媒体与事件基线 | PKG-MB-01, ENG-05, ENG-08 | MP4/WebM/HLS/Blob/Stream、seek/错误/轨道切换样本 | ready 事件顺序、音画同步、超时和释放可重跑 | H | doing |
 | PKG-MB-03 | artplayer-proxy-mediabunny<br>整理 input 与加载取消 | PKG-MB-02, CORE-09 | input.js 源检测、输入资源、Range 与取消 | HLS 检测在 input 边界，旧来源类型和超时保持 | H | todo |
 | PKG-MB-04 | artplayer-proxy-mediabunny<br>整理 VideoShim/EventTarget/Engine 协调 | PKG-MB-03, CORE-06, CORE-11 | shim 描述符、事件桥、加载状态和操作隔离 | 公开属性/同步异步返回与事件重入顺序保持 | H | todo |
 | PKG-MB-05 | artplayer-proxy-mediabunny<br>整理视频解码、seek 和帧释放 | PKG-MB-04 | VideoEngine 调度、队列、晚帧处理和资源释放 | 暂停/seek/切源无旧帧覆盖，默认丢帧策略不变 | H | todo |
@@ -521,4 +521,5 @@
 - 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)
 - PKG-CANVAS-04: [记录](changes/2026-09-12-PKG-CANVAS-04-types.md) [记录](baselines/canvas-types-validation.json) [记录](canvas-validation.md)
 - PKG-MB-01: [记录](baselines/mb-release.json) [记录](baselines/mb-surface.json) [记录](baselines/mb-contract.md) [记录](baselines/mb-contract-validation.json) [记录](mb-validation.md) [记录](changes/2026-09-12-PKG-MB-01-contract.md)
+- PKG-MB-02: [记录](changes/2026-09-12-PKG-MB-02-checkpoint.md) [记录](baselines/mb-media-checkpoint.json) [记录](mb-validation.md)
 - PKG-FACTORY-01: [记录](baselines/factory-assignment-gaps.json) [记录](baselines/factory-compatibility-proposals.json) [记录](factory-compatibility-decision.md) [记录](changes/2026-09-12-PKG-FACTORY-01-decision.md)
diff --git a/refactor/progress.md b/refactor/progress.md
index 1b1b1c077..e59fe95e9 100644
--- a/refactor/progress.md
+++ b/refactor/progress.md
@@ -1,5 +1,13 @@
 # 进度与证据
 
+## 当前检查点：PKG-MB-02 真实MP4与销毁负例
+
+22项Node（含3个销毁后晚加载历史缺陷）通过；6项浏览器检查中，4项Chromium/Firefox
+真实MP4像素/时钟/暂停成功，2项Windows WebKit明确能力失败对照。六项不是六次播放成功。
+见[检查点](changes/2026-09-12-PKG-MB-02-checkpoint.md)和[证据](baselines/mb-media-checkpoint.json)。
+MB-02仍doing，剩余WebM/HLS/Blob/Stream、seek、时序与释放；98 done、8 doing、116 todo。
+本步没有修改生产源码。Canvas/Ambilight类型取舍仍待确认。
+
 ## 最新完成：PKG-MB-01 MediaBunny proxy 契约基线
 
 冻结实际npm1.0.0/1.2.0共12成员、17个Git输入、3份产物接口表面与25条配置路径；
diff --git a/refactor/risk-table.md b/refactor/risk-table.md
index 3d2b4dd84..59fc2ac7f 100644
--- a/refactor/risk-table.md
+++ b/refactor/risk-table.md
@@ -169,5 +169,6 @@
 | DPIP-RESOLVE-01 | resolved / 已复现 | Historical Document PiP exports hide declarations or infer an uncallable CommonJS namespace in modern resolution | PKG-DPIP-04, PKG-DPIP-06 |
 | FACTORY-TYPE-01 | open / 已复现 | Canvas and Ambilight default self property narrows assignability of historical factory replacements | PKG-FACTORY-01 |
 | MB-LICENSE-01 | open / 已复现 | Historical MediaBunny proxy bundles embed SDK code without MPL notice markers or separate license/source provenance | PKG-MB-10 |
-| MB-LIFE-01 | open / 源码/产物事实 | MediaBunny load, track replacement, timeout, RAF and audio callbacks lack one shared terminal owner | PKG-MB-02, PKG-MB-03, PKG-MB-04, PKG-MB-05, PKG-MB-06, PKG-MB-07, PKG-MB-09 |
+| MB-LIFE-01 | open / 已复现 | MediaBunny load, track replacement, timeout, RAF and audio callbacks lack one shared terminal owner | PKG-MB-02, PKG-MB-03, PKG-MB-04, PKG-MB-05, PKG-MB-06, PKG-MB-07, PKG-MB-09 |
 | MB-TYPE-01 | open / 已复现 | MediaBunny proxy declares only Canvas while exposing a shim and changes CommonJS export generation between releases | PKG-MB-08, PKG-MB-10 |
+| MB-CAP-01 | open / 已复现 | Current Windows WebKit lacks WebCodecs and Web Audio constructors needed by historical MediaBunny proxies | PKG-MB-02, PKG-MB-09 |
diff --git a/refactor/risks.json b/refactor/risks.json
index effb957ba..846950375 100644
--- a/refactor/risks.json
+++ b/refactor/risks.json
@@ -3638,7 +3638,7 @@
     {
       "id": "MB-LIFE-01",
       "title": "MediaBunny load, track replacement, timeout, RAF and audio callbacks lack one shared terminal owner",
-      "confirmation": "source-observed",
+      "confirmation": "reproduced",
       "owners": [
         "PKG-MB-02",
         "PKG-MB-03",
@@ -3648,13 +3648,15 @@
         "PKG-MB-07",
         "PKG-MB-09"
       ],
-      "compatibleResolution": "Reproduce pending operations and destroy/source-switch races before migrating each owner; preserve public event and promise behavior while preventing stale resource use.",
+      "compatibleResolution": "Reproduce pending operations and destroy/source-switch races before migrating each owner; preserve public event and promise behavior while preventing stale resource use. MB-02 now reproduces late load rejection and uncancelled waiting/loadstart timers after destroy in all three historical implementations using a controlled host. Other interleavings and full-core native behavior are not yet verified.",
       "closureCriteria": "Historical failing interleavings and candidate cancellation/cleanup pass with real media and event evidence, including long playback and track topology.",
       "status": "open",
       "evidence": [
         "refactor/baselines/mb-release.json",
         "refactor/baselines/mb-contract.md",
-        "refactor/changes/2026-09-12-PKG-MB-01-contract.md"
+        "refactor/changes/2026-09-12-PKG-MB-01-contract.md",
+        "refactor/changes/2026-09-12-PKG-MB-02-checkpoint.md",
+        "refactor/baselines/mb-media-checkpoint.json"
       ]
     },
     {
@@ -3673,6 +3675,22 @@
         "refactor/baselines/mb-contract.md",
         "refactor/changes/2026-09-12-PKG-MB-01-contract.md"
       ]
+    },
+    {
+      "id": "MB-CAP-01",
+      "title": "Current Windows WebKit lacks WebCodecs and Web Audio constructors needed by historical MediaBunny proxies",
+      "status": "open",
+      "confirmation": "reproduced",
+      "owners": [
+        "PKG-MB-02",
+        "PKG-MB-09"
+      ],
+      "compatibleResolution": "Keep exact capability negative controls and validate usable browsers/codecs separately; improve unsupported-capability reporting during migration without fabricating decoder support.",
+      "closureCriteria": "Per-browser native media/support matrix and predictable unsupported-capability behavior verified, including target Safari evidence where support is claimed.",
+      "evidence": [
+        "refactor/changes/2026-09-12-PKG-MB-02-checkpoint.md",
+        "refactor/baselines/mb-media-checkpoint.json"
+      ]
     }
   ]
 }
diff --git a/refactor/tasks.json b/refactor/tasks.json
index 5a16794da..cf796d1ae 100644
--- a/refactor/tasks.json
+++ b/refactor/tasks.json
@@ -3416,11 +3416,15 @@
         "ENG-05",
         "ENG-08"
       ],
-      "status": "todo",
+      "status": "doing",
       "risk": "H",
       "deliverable": "MP4/WebM/HLS/Blob/Stream、seek/错误/轨道切换样本",
       "acceptance": "ready 事件顺序、音画同步、超时和释放可重跑",
-      "evidence": []
+      "evidence": [
+        "changes/2026-09-12-PKG-MB-02-checkpoint.md",
+        "baselines/mb-media-checkpoint.json",
+        "mb-validation.md"
+      ]
     },
     {
       "id": "PKG-MB-03",
diff --git a/test/browser/mediabunny.spec.js b/test/browser/mediabunny.spec.js
new file mode 100644
index 000000000..6fd0fdc59
--- /dev/null
+++ b/test/browser/mediabunny.spec.js
@@ -0,0 +1,72 @@
+import { hash } from '../../refactor/scripts/releases.mjs'
+import { mbHistorical } from '../helpers/mediabunny.js'
+import { expect, test } from './fixtures.js'
+
+const implementations = (await mbHistorical()).filter(item => item.name.startsWith('published'))
+
+for (const implementation of implementations) {
+  test(`MediaBunny ${implementation.name}: native MP4 playback or exact Windows WebKit capability failure`, async ({ page, browserName }, testInfo) => {
+    await page.goto('/test/player.html?core=published')
+    await page.addScriptTag({ content: `(() => {
+      const module = { exports: {} }; const exports = module.exports;
+      ${implementation.code};
+      window.mbFactory = module.exports.default || module.exports;
+    })();` })
+    await page.evaluate(() => {
+      window.mbEvents = []
+      window.mbActions = []
+      window.art = new window.Artplayer({ container: '.player', url: '/test/pattern.mp4', muted: true, proxy: window.mbFactory() })
+      for (const name of window.Artplayer.config.events) {
+        window.art.on(`video:${name}`, () => window.mbEvents.push({ name, time: performance.now(), currentTime: window.art.video.currentTime, readyState: window.art.video.readyState }))
+      }
+      document.querySelector('#play').onclick = () => window.art.play().catch(error => window.mbActions.push({ name: error.name, message: error.message }))
+    })
+    const capabilities = await page.evaluate(() => ({
+      secure: isSecureContext,
+      VideoDecoder: typeof VideoDecoder,
+      AudioDecoder: typeof AudioDecoder,
+      AudioContext: typeof AudioContext,
+      webkitAudioContext: typeof window.webkitAudioContext,
+      coreVersion: window.Artplayer.version,
+    }))
+    let outcome = 'unverified'
+    try {
+      expect(capabilities.secure).toBe(true)
+      expect(capabilities.coreVersion).toBe('5.4.0')
+      if (capabilities.VideoDecoder === 'undefined' || (capabilities.AudioContext === 'undefined' && capabilities.webkitAudioContext === 'undefined')) {
+        expect(browserName).toBe('webkit')
+        expect(capabilities).toMatchObject({ VideoDecoder: 'undefined', AudioDecoder: 'undefined', AudioContext: 'undefined', webkitAudioContext: 'undefined' })
+        await expect.poll(() => page.evaluate(() => window.art.video.error?.code)).toBe(4)
+        expect(await page.evaluate(() => window.art.video.error.message)).toMatch(/not a constructor/)
+        expect(await page.evaluate(() => ({ ready: window.art.isReady, width: window.art.video.videoWidth, height: window.art.video.videoHeight }))).toEqual({ ready: false, width: 0, height: 0 })
+        outcome = 'verified-unsupported-capability-control'
+      }
+      else {
+        await expect.poll(() => page.evaluate(() => window.art.isReady)).toBe(true)
+        await page.click('#play')
+        await expect.poll(() => page.evaluate(() => window.art.video.currentTime)).toBeGreaterThan(0.15)
+        const pixels = await page.evaluate(() => {
+          const canvas = window.art.video
+          const context = canvas.getContext('2d')
+          return { size: [canvas.width, canvas.height, canvas.videoWidth, canvas.videoHeight], corner: [...context.getImageData(0, 0, 1, 1).data], center: [...context.getImageData(160, 90, 1, 1).data] }
+        })
+        expect(pixels.size).toEqual([320, 180, 320, 180])
+        expect(pixels.corner[0]).toBeGreaterThan(200)
+        expect(pixels.center[2]).toBeGreaterThan(200)
+        expect([pixels.corner[3], pixels.center[3]]).toEqual([255, 255])
+        await page.evaluate(() => window.art.video.pause())
+        expect(await page.evaluate(() => window.art.video.paused)).toBe(true)
+        expect(await page.evaluate(() => window.mbActions)).toEqual([])
+        outcome = 'native-mp4-playback-observed'
+      }
+    }
+    finally {
+      const state = await page.evaluate(() => {
+        const canvas = window.art.video
+        return { events: window.mbEvents, actions: window.mbActions, ready: window.art.isReady, dimensions: [canvas.width, canvas.height, canvas.videoWidth, canvas.videoHeight], paused: canvas.paused, currentTime: canvas.currentTime, error: canvas.error, readyState: canvas.readyState, audioState: canvas.engine?.audio?.audioContext?.state }
+      })
+      await testInfo.attach('mediabunny-input', { contentType: 'application/json', body: JSON.stringify({ implementation: implementation.name, sha256: hash(implementation.code), capabilities, outcome, state, scope: 'Two actual published proxies with actual core5.4.0; native MP4 pixels/clock or explicitly unsupported Windows WebKit APIs. No candidate, HLS or AV-sync acceptance.' }) })
+      await page.evaluate(() => window.art.destroy(false))
+    }
+  })
+}
diff --git a/test/helpers/mediabunny.js b/test/helpers/mediabunny.js
index 9d164d553..1dd38d0d5 100644
--- a/test/helpers/mediabunny.js
+++ b/test/helpers/mediabunny.js
@@ -65,8 +65,8 @@ export function mbEnvironment({ code }, option = {}) {
     URL,
     console,
     performance,
-    setTimeout,
-    clearTimeout,
+    setTimeout: option.setTimeout || setTimeout,
+    clearTimeout: option.clearTimeout || clearTimeout,
     requestAnimationFrame(fn) {
       const id = nextFrame++
       frames.set(id, fn)
diff --git a/test/mediabunny.test.js b/test/mediabunny.test.js
new file mode 100644
index 000000000..0cdde8907
--- /dev/null
+++ b/test/mediabunny.test.js
@@ -0,0 +1,43 @@
+import assert from 'node:assert/strict'
+// eslint-disable-next-line test/no-import-node-test -- Freeze historical lifecycle failures before candidate fixes.
+import test from 'node:test'
+import { mbEnvironment, mbHistorical } from './helpers/mediabunny.js'
+
+for (const implementation of await mbHistorical()) {
+  test(`MediaBunny historical ${implementation.name}: destroy still permits late load errors and scheduled events`, async () => {
+    const timers = new Map()
+    let nextTimer = 0
+    const env = mbEnvironment(implementation, {
+      setTimeout(fn) {
+        const id = nextTimer++
+        timers.set(id, fn)
+        return id
+      },
+      clearTimeout(id) { timers.delete(id) },
+    })
+    const canvas = env.factory()(env.art)
+    const engine = canvas.engine
+    const events = []
+    for (const name of ['waiting', 'loadstart', 'error'])
+      canvas.events.addEventListener(name, () => events.push(name))
+    let reject
+    const pending = new Promise((resolve, fail) => {
+      reject = fail
+    })
+    engine.performLoad = () => pending
+    const loading = engine.load('controlled-input')
+    const generation = engine.loadSeq
+    env.art.emit('destroy')
+    assert.equal(engine.loadSeq, generation, 'Destroy does not invalidate the load generation')
+    assert.equal(env.art.mediabunny, undefined)
+    assert.equal(timers.size, 2, 'Waiting and loadstart timers still exist after destroy')
+    reject(new Error('late controlled rejection'))
+    await loading
+    for (const fn of timers.values()) fn()
+    timers.clear()
+    assert.deepEqual(events, ['error', 'waiting', 'loadstart'])
+    assert.equal(env.emitted.at(-1).name, 'video:error')
+    assert.deepEqual({ ...engine.error }, { code: 4, message: 'late controlled rejection' })
+    assert.equal(engine.networkState, 3)
+  })
+}