[lanyue-llk]

Review split

This integration PR is superseded by the focused PRs below. Review and merge those units; this PR retains the original source history and review discussion.

PR	Problem addressed	GitHub base
#1591	Visible labels, resource URLs and literal preformatted source	main
#1592	Stale/nested iframe snapshots and frame-relative media URLs	#1591
#1593	Layout-owned notifications, callback microtasks and bounded broadcast continuity	main
#1584	Premature completion, absolute deadlines and task-source starvation	main
#1585	Native objects after public constructor replacement	main
#1586	V8 termination during cross-origin cache access	main
#1587	PermissionStatus EventTarget behavior	main
#1588	MSE support advertised without an operational playback API	main
#1589	Concurrent IndexedDB fixture directories	main

Only the iframe layer depends on the Markdown layer. The remaining units have no unmerged feature prerequisites. Every PR includes a concrete reproduction, executable regression fixtures and links to the exact test source.

Validation and scope

The final integration source is 1940fb926. Formatting and workspace/all-target/all-feature Clippy pass; the complete workspace nextest suite passes with 20,143 tests and 17 original skips. The split patches reconstruct the complete integration tree exactly on the original base. The extracted PRs retain current main's callback-registry API.

Markdown remains a DOM snapshot. These changes add no PDF/DOCX parser, benchmark-specific selector, or extra network extraction step. Permission and media changes preserve the existing capability boundaries.

Published benchmark results remain bound to measured builds a737f2aec and 0d9a7ceb2. This source split does not replace their executables or measurements.

[github-actions]

Spider Bench A/B

✅ All benchmark browser service runs completed; results are informational.

Public HEAD: 184 / 240 rows; 38 / 48 sites produced rows; 10 unexpected empty sites.

✅ Deterministic fixture contract is clean.

Common ancestor 6d1496a149e4 → HEAD 0d9a7ceb25f6; benchmark order: head-first; workflow: success.

Public 48-site run · informational

Metric	Base	HEAD	Δ
Run status	success	success	—
Extracted rows / contract	184 / 240	184 / 240	0 (0.00%)
Contract fill	76.67%	76.67%	0.00 pp (0.00%)
Sites with rows	38 / 48	38 / 48	0 (0.00%)
Sites meeting row contract	36 / 48	36 / 48	0 (0.00%)
Unexpected empty sites	10	10	0 (0.00%)
Partial-row sites	2	2	0 (0.00%)
Site outcomes	extracted: 37; HTTP error + rows: 1; empty: 7; HTTP error + empty: 1; snapshot error + empty: 2	extracted: 36; HTTP error + rows: 2; empty: 7; HTTP error + empty: 1; snapshot error + empty: 2	—
Observed duration	47.67 s	49.92 s	+2.24 s (+4.70%)
Estimated CPU	53.27 s	50.73 s	-2.54 s (-4.76%)
Peak PSS	279.62 MiB	288.50 MiB	+8.89 MiB (+3.18%)
Peak RSS	282.88 MiB	291.20 MiB	+8.31 MiB (+2.94%)
Peak threads	27	26	-1 (-3.70%)
Mismatched sites	0	0	0
Timeout with items	0	0	0

Category rows	Base	HEAD	Δ
news	35 / 40	35 / 40	0
stocks	20 / 40	20 / 40	0
tech	35 / 40	35 / 40	0
sports	27 / 40	27 / 40	0
games	37 / 40	37 / 40	0
life	30 / 40	30 / 40	0

Public-site content, timing, and memory are noisy. This single A/B run reports evidence only; site outcome counts explain missing rows without treating them as a deterministic regression.

CPU and memory timelines

These are bounded 40-point views of the same complete process-tree samples used by the HTML report. CPU uses 100% per occupied logical core; memory lines are RSS first and PSS second when complete PSS samples are available.

Base

xychart-beta
    title "Base CPU"
    x-axis "Elapsed seconds" [1.036, 1.536, 2.538, 4.041, 5.043, 5.543, 6.545, 8.047, 9.551, 10.552, 12.054, 13.555, 14.557, 16.059, 17.56, 18.061, 18.561, 20.062, 21.565, 22.567, 24.068, 25.569, 26.571, 28.072, 29.575, 30.576, 32.078, 33.58, 34.581, 36.084, 37.586, 38.587, 40.09, 41.592, 42.593, 44.095, 45.596, 46.598]
    y-axis "CPU percent" 0 --> 500
    line [7.98, 131.92, 129.74, 117.72, 209.57, 197.75, 203.67, 123.83, 171.57, 149.89, 177.8, 82.05, 97.79, 131.91, 9.99, 2, 69.97, 149.84, 45.89, 117.87, 115.93, 135.78, 145.7, 119.9, 127.65, 145.94, 179.78, 121.83, 145.82, 77.91, 8, 89.87, 103.78, 13.97, 107.85, 194.02, 125.97, 173.78]

Loading

xychart-beta
    title "Base memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.035, 1.036, 1.536, 2.538, 4.041, 5.043, 5.543, 6.545, 8.047, 9.551, 10.552, 12.054, 13.555, 14.557, 16.059, 17.56, 18.061, 18.561, 20.062, 21.565, 22.567, 24.068, 25.569, 26.571, 28.072, 29.575, 30.576, 32.078, 33.58, 34.581, 36.084, 37.586, 38.587, 40.09, 41.592, 42.593, 44.095, 45.596, 46.598, 47.673]
    y-axis "Memory MiB" 0 --> 500
    line [12.6, 65.39, 114.2, 127.65, 131.61, 174.65, 179.76, 214.88, 224.44, 167.66, 156.8, 180.08, 154.17, 171.29, 172.5, 144.15, 145.7, 154.37, 179.59, 144.78, 152.48, 181.39, 157.54, 170.06, 282.88, 218.34, 187.89, 173.79, 154.73, 172.36, 166.38, 155.43, 186.64, 189.39, 178.95, 184.25, 185.16, 170.93, 201.2, 0]
    line [9.39, 61.88, 110.32, 124.12, 128.08, 171.13, 176.26, 211.44, 220.87, 164.29, 153.21, 176.52, 150.68, 167.68, 168.89, 140.55, 142.1, 150.69, 175.99, 141.16, 148.88, 177.79, 154.01, 166.61, 279.62, 214.75, 184.16, 170.27, 151.2, 168.63, 162.93, 151.83, 183.07, 186.25, 175.35, 180.54, 180.89, 167.44, 197.68, 0]

Loading

HEAD

xychart-beta
    title "HEAD CPU"
    x-axis "Elapsed seconds" [1.536, 2.537, 3.038, 4.039, 5.04, 5.541, 7.044, 8.546, 9.547, 11.05, 12.552, 14.054, 15.556, 16.558, 18.059, 19.561, 21.062, 22.063, 23.565, 25.067, 26.068, 26.569, 28.072, 29.072, 30.572, 32.075, 33.577, 34.578, 36.08, 37.582, 39.084, 40.586, 41.587, 43.09, 44.591, 46.091, 47.091, 48.593]
    y-axis "CPU percent" 0 --> 200
    line [133.89, 135.96, 139.74, 107.76, 151.88, 175.66, 163.54, 77.96, 173.77, 57.92, 45.95, 133.75, 1.99, 73.91, 131.85, 0, 75.94, 147.89, 99.95, 147.87, 103.81, 113.81, 147.91, 147.94, 43.93, 103.79, 113.83, 85.89, 95.85, 5.99, 137.66, 83.89, 79.86, 13.97, 115.98, 135.96, 25.95, 140]

Loading

xychart-beta
    title "HEAD memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.035, 1.536, 2.537, 3.038, 4.039, 5.04, 5.541, 7.044, 8.546, 9.547, 11.05, 12.552, 14.054, 15.556, 16.558, 18.059, 19.561, 21.062, 22.063, 23.565, 25.067, 26.068, 26.569, 28.072, 29.072, 30.572, 32.075, 33.577, 34.578, 36.08, 37.582, 39.084, 40.586, 41.587, 43.09, 44.591, 46.091, 47.091, 48.593, 49.916]
    y-axis "Memory MiB" 0 --> 500
    line [12.46, 116.92, 126.26, 138.18, 134.88, 161.49, 160.5, 187.01, 158.18, 197.11, 169.49, 188.61, 178.09, 152.03, 154.23, 160.27, 144.43, 148.24, 165.33, 159.86, 161.98, 291.2, 232.27, 211.16, 223.85, 164.37, 187.29, 180.58, 163.38, 151.58, 151.73, 224.03, 263.97, 193.38, 166.45, 180.96, 165.11, 153.53, 190.42, 0]
    line [9.26, 113.38, 122.59, 134.65, 131.35, 158.01, 156.94, 183.55, 154.61, 193.5, 165.9, 185.02, 174.5, 148.45, 150.65, 156.69, 140.86, 144.64, 162.32, 156.29, 160.05, 288.5, 228.21, 207.62, 220.43, 161.56, 183.71, 176.82, 159.81, 147.98, 148.14, 220.87, 260.5, 189.78, 162.85, 177.38, 161.46, 149.93, 186.85, 0]

Loading

Deterministic fixture · required contract

The fixture exercises 15 routes: 8 are expected to emit rows and 7 intentionally exercise empty, loading, or timeout behavior.

Metric	Base	HEAD	Δ
Run status	success	success	—
Extracted rows / contract	40 / 40	40 / 40	0 (0.00%)
Contract fill	100.00%	100.00%	0.00 pp (0.00%)
Sites with rows	8 / 15	8 / 15	0 (0.00%)
Sites meeting row contract	15 / 15	15 / 15	0 (0.00%)
Unexpected empty sites	0	0	0
Partial-row sites	0	0	0
Site outcomes	extracted: 7; HTTP error + rows: 1; empty: 3; timeout + empty: 4	extracted: 7; HTTP error + rows: 1; empty: 3; timeout + empty: 4	—
Observed duration	19.85 s	19.87 s	+0.01 s (+0.07%)
Estimated CPU	0.41 s	0.41 s	0.00 s (0.00%)
Peak PSS	67.10 MiB	67.61 MiB	+0.51 MiB (+0.76%)
Peak RSS	70.53 MiB	70.53 MiB	0.00 MiB (0.00%)
Peak threads	18	18	0 (0.00%)
Mismatched sites	0	0	0
Timeout with items	0	0	0

Full HTML, JSON, CSV, logs, and page snapshots: workflow run and full spider-bench-results artifact.

The public-web A/B is informational. The exact HEAD fixture contract runs as a separate required CI check; timing and public-site content deltas remain non-blocking.

[github-actions]

CI Regression Report

Source CI run · source state at render: in_progress · artifacts: 6/6

Check	Status	Signal
Release regression	✅	HEAD/base failures 0/0; raw binary +0.028362%
Frontend differential	✅	1,020/1,020 cases matched; 0 issues
Agent episodes	✅	8/8 Moli episodes passed; 0 failures
Runtime/CDP contracts	✅	26 contract cases; 0 failures
CDP smoke	✅	52/52 groups passed; 621 scenarios
WebMainBench	✅	545/545 completed; 0 unexpected failures

Release regression — ✅ HEAD/base failures 0/0; raw binary +0.028362%

Package and image size

Metric	Base	HEAD	Delta	Delta %
Raw binary	152.95 MiB	153.00 MiB	+44.42 KiB	+0.028362%
Stripped binary	106.29 MiB	106.33 MiB	+40.00 KiB	+0.036750%
gzip binary	52.67 MiB	52.69 MiB	+24.15 KiB	+0.044773%
Rootfs	159.85 MiB	159.90 MiB	+50.00 KiB	+0.030546%
gzip rootfs	61.71 MiB	61.73 MiB	+24.86 KiB	+0.039348%

Startup latency and PSS

Case	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta
Serve ready	27.32 ms	27.13 ms	−0.19 ms	3.88 MiB	5.19 MiB	+1.31 MiB
CDP first page	50.82 ms	49.88 ms	−0.94 ms	4.48 MiB	3.59 MiB	−913.50 KiB
CDP warm page	12.39 ms	11.42 ms	−0.97 ms	50.25 MiB	50.95 MiB	+709.50 KiB
CLI about:blank	15.34 ms	15.06 ms	−0.28 ms	3.33 MiB	4.38 MiB	+1.05 MiB
CLI local JS	18.92 ms	18.81 ms	−0.10 ms	4.35 MiB	3.36 MiB	−1018.50 KiB

Concurrency matrix

Concurrency	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta	HEAD failures	Unstable B/H
1	17.24 ms	17.53 ms	+0.29 ms	867.00 KiB	821.00 KiB	−46.00 KiB	0	0/0
5	20.12 ms	20.40 ms	+0.28 ms	12.90 MiB	28.27 MiB	+15.38 MiB	0	0/0
10	21.24 ms	20.26 ms	−0.97 ms	12.62 MiB	28.02 MiB	+15.40 MiB	0	0/0
25	20.11 ms	21.96 ms	+1.85 ms	13.48 MiB	26.75 MiB	+13.27 MiB	0	0/0
100	21.07 ms	21.08 ms	+0.01 ms	27.92 MiB	13.93 MiB	−13.99 MiB	0	0/0

Frontend differential — ✅ 1,020/1,020 cases matched; 0 issues

Match	DOM mismatch	Diagnostic mismatch	Moli error	Reference error	Infrastructure error	Mismatched frames	Duration
1,020	0	0	0	0	0	0	6m 33.42s

Agent episodes · Moli vs Chromium — ✅ 8/8 Moli episodes passed; 0 failures

Fast contract	Episodes	Passed	Assertions	Ready p50	Episode p50
Moli	8	8	47/47	3.92 ms	24.88 ms
Chromium	8	8	47/47	270.37 ms	85.27 ms

Operation p50	Chromium	Moli	Delta	Delta %
navigate	44.58 ms	5.82 ms	−38.76 ms	−86.95%
observe	0.89 ms	0.95 ms	+0.06 ms	+6.96%
fill	3.56 ms	3.37 ms	−0.20 ms	−5.54%
click	5.65 ms	4.21 ms	−1.43 ms	−25.40%

Idle-resource episode	Peak RSS	Peak PSS	Average CPU	Peak CPU	Peak processes	Sampler
Moli	66.39 MiB	63.69 MiB	0.74%	10.01%	1	✅
Chromium	1287.96 MiB	333.51 MiB	2.34%	91.97%	13	⚠️ PSS partial

Runtime and CDP session contracts — ✅ 26 contract cases; 0 failures

Suite	Cases	Failures	Median case p50	Median case p95	Median peak PSS p50
Synthetic fetch	13	0	17.42 ms	18.33 ms	707.00 KiB
Long-lived CDP session	13	0	17.93 ms	19.27 ms	—

CDP smoke — ✅ 52/52 groups passed; 621 scenarios

Workers: 4 · cumulative group time: 163.12 s · failed groups: 0

Slowest group	Scenarios	Duration	Status
scrollbar-visibility	22	20.99 s	✅
target-lifecycle	24	13.74 s	✅
dom-input	27	10.60 s	✅
chromium-cdp	56	9.65 s	✅
multi-page	45	9.57 s	✅

WebMainBench · 545 pages — ✅ 545/545 completed; 0 unexpected failures

Completed	Successful	Expected DNS failure	Unexpected failures	Panics	Crashes	Timeouts	Empty output
545/545	544	1	0	0	0	0	0

Frozen HTML · Linux · --wait done · 45 seconds per page · no retries. Content quality is evaluated separately.

Diagnostics: webmainbench-results — every page's Markdown, stderr, and exit status. Source run and artifacts

All artifact fields are parsed by the trusted default-branch renderer; missing or invalid inputs remain visible as unavailable.

[github-actions]

Sequential Navigation Soak A/B

✅ HEAD completed the 200-navigation resilience and memory observation.

One browser process, one target, and one CDP session navigate CSDN → SegmentFault → Huaban → example.com repeatedly. This run issued 200 Page.navigate commands per binary.

Common ancestor 6d1496a149 → HEAD 0d9a7ceb25; benchmark order: head-first; workflow: success.

Session resilience

Metric	Base	HEAD
Attempted / planned	200 / 200	200 / 200
Direct observable pass	199 / 200	199 / 200
Failures / recovered	1 / 1	1 / 1
Recovery failures	0	0
Lifecycle order violations	0	0
Network order violations	0	0
Wall time	463.8 s	457.4 s

A public-page failure is reported separately from an unrecoverable session. The soak requires all navigation attempts, zero failed recovery, zero lifecycle/network ordering violations, and complete resource evidence.

Process-tree memory

Metric	Base	HEAD	Δ
Boundary samples	200	200	0
Boundary RSS samples	200	200	0
Boundary PSS samples	200	200	0
Periodic peak RSS	251.0 MiB	251.0 MiB	+0.0 MiB
Periodic peak PSS	248.0 MiB	247.5 MiB	-0.5 MiB
RSS · first 10 avg	183.4 MiB	185.7 MiB	+2.3 MiB
RSS · last 10 avg	186.7 MiB	182.9 MiB	-3.7 MiB
RSS · last − first window	+3.2 MiB	-2.7 MiB	-6.0 MiB
RSS · warm slope / 100 nav	+2.4 MiB	+2.9 MiB	+0.4 MiB
PSS · first 10 avg	180.6 MiB	182.3 MiB	+1.7 MiB
PSS · last 10 avg	185.0 MiB	180.1 MiB	-4.9 MiB
PSS · last − first window	+4.4 MiB	-2.3 MiB	-6.7 MiB
PSS · warm slope / 100 nav	+3.5 MiB	+3.2 MiB	-0.3 MiB
Peak file descriptors	64	62	-2
Peak threads	31	31	0

HEAD memory by 50-navigation quarter

HEAD range	Avg RSS	Final RSS	Peak RSS	Avg PSS	Final PSS	Peak FD
1–50	183.3 MiB	157.5 MiB	251.8 MiB	179.9 MiB	154.3 MiB	54
51–100	178.5 MiB	172.0 MiB	238.7 MiB	175.6 MiB	169.1 MiB	54
101–150	185.4 MiB	164.6 MiB	239.3 MiB	182.5 MiB	161.7 MiB	56
151–200	185.6 MiB	176.8 MiB	232.6 MiB	182.8 MiB	173.9 MiB	54

Raw reports and per-navigation boundary samples: workflow run and full sequential-navigation-soak-results artifact.

Public-site timing and memory are observational. Use the A/B deltas and trend shape as evidence, not as a deterministic performance threshold.

[lanyue-llk]

审查提交：0d9a7ceb25f630e7a296e83011e2d11f0279c5a7。结论：建议修复以下两项 P2 后再合并，具体复现和修正方向见行内评论。

本 PR 要解决的是抓取结果缺失或过期：读取当前 iframe 文档、处理 load 后已就绪的任务、等待解析器和子文档的异步启动，以及补齐影响页面脚本执行的浏览器接口。已检查全部 56 个变更文件及相关调用链。

沿用 renderer 的任务调度、保存的原生原型和现有 EventTarget 实现，方向合理；未实现 SourceBuffer 生命周期时停止声称支持 MSE，也比让页面进入不可用的播放路径更合适。两个需要修改的地方分别是状态归属和 URL 属性覆盖：ResizeObserver 的派发状态必须区分文档，iframe 资源地址转换必须覆盖新输出的 poster。这些都应在现有抽象里补齐，无需增加针对特定网站的分支。

本次在独立源码副本中实测：抓取输出 16 项、HTML 转 Markdown 305 项、抓取生命周期 71 项、renderer 相关接口与调度 98 项、Done/Load 边界 4 项，共 494 项现有测试通过。另加 4 个边界场景，复现了行内所述的 2 个问题；有限布局反馈和启动时立即终止 Worker 的场景通过。跨 iframe observer 场景另用 Chrome 对照，Chrome 收到目标宽度 80，当前 PR 的通知列表为空。

这说明现有测试尚未覆盖这两个组合场景。建议补入跨文档回调注册、子文档不同 base 下的媒体封面测试，避免后续回退。

[lanyue-llk]

复审提交：041584bcd0e0655d4289cccda7c9c9efd144eba5。结论：当前仍有 1 项 P1、4 项 P2，建议修复后再合并。五项均有独立复现，详见行内评论。

本 PR 的目标是修复抓取结果缺失或过期，以及阻碍页面脚本运行的兼容问题。本轮重新核对了全部 56 个变更文件，并按 observer、Markdown/iframe、生命周期与兼容接口三个方向并行审查。上一轮的跨文档 observer 注册和 iframe poster 地址问题已复测通过。

当前剩余问题涉及行为边界：Done 没有保住调用方的绝对超时；ResizeObserver 广播缺少回调间的微任务检查点，深度计算没有跨 ShadowRoot，固定 32 轮上限又会截断合法更新并卡住后续通知；目录链接的处理还会改写真正的源码。这些需要修正现有等待、广播和序列化逻辑。尤其是循环保护应依据正确的树和实际待处理工作，单纯增加次数或再补一个特例不能解决。

本轮实测：现有抓取输出 18 项、Markdown regressions 29 项通过；额外 10 个场景中 6 个失败，对应上述 5 个根因，另外 4 个通过。失败场景已串行重跑，两个 Done 超时场景还分别放进独立进程复测。三个 observer 场景均与安装的 Chrome 对照；深层通知在第二次显式布局更新后仍无法恢复。代码示例污染也对照了基础提交的正确输出。

其他已核查的 iframe base/strip/嵌套展开、原生原型保存、PermissionStatus 继承、MediaSource 能力探测和任务源公平性，未发现足以提交的其他具体缺陷。

[lanyue-llk]

复审提交：f1ee662f6d2a276b4882a041fb728c8c8e4e1d7a。当前仍有 3 项 P2：两项由本次 observer 修正引入的组合行为错误，以及一项代码块回退尚未修完整。建议处理后再合并。

本轮按三个方向核对了 PR 全部 58 个变更文件及本次增量。上一轮 Done 的返回超时、直接 Shadow DOM 深度、回调之间的微任务顺序，以及单纯 40 层有限布局更新，独立复现均已通过。但预算续任务丢失迭代深度，会重复执行浅层回调并提前误报循环；新检查点 helper 又会把 Promise 拒绝事件提前派发。这两项详见行内评论，都已用 Chrome 对照。

代码块修复仅覆盖 code 子树，Javadoc 的直接 pre 签名和带 language-rust 的 pre 仍被插入链接地址。已在原问题线程补充两类失败用例及官方页面源码，不重复开同根问题。

验证方面，现有抓取输出 18 项、Markdown regressions 31 项通过，上轮 9 个抓取边界场景通过；本轮两个 observer 组合场景和两类直接 pre 场景均失败。observer 对照分别得到：Chrome rootCalls=1 且无错误，当前为 2 且发一次 loop error；Chrome 的 Promise 拒绝事件为空，当前多发 unhandledrejection/rejectionhandled。

另实测到超时返回后忙脚本可能继续阻塞同 Browser 的其他页面，但完全不使用新功能的原有 Load/解析器路径同样复现，相关取消实现与基础提交没有变化。这是既有取消缺陷，未作为本 PR 引入的问题提交。