[ldm0]

ShadowRoot members and the related slot/text bindings now use native receiver brands through generated declarations. Retain the native owner resolution inside the implementation, and expose the existing onslotchange callbacks through the ShadowRoot declaration.

Regression coverage checks cross-realm genuine receivers, forged/proxy rejection, conversion ordering and live/windowless owner behavior.

Depends on #1861.

Validation on base cdb102cdc607: cargo fmt --all; cargo clippy --workspace --all-targets --all-features -- -D warnings; cargo nextest run --no-fail-fast. All passed (20,531 passed, 18 existing skips; 32 build jobs and test threads, no automatic retries). Focused regressions also passed.

[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 +0.005232%
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; 622 scenarios
WebMainBench	✅	545/545 completed; 0 unexpected failures

Release regression — ✅ HEAD/base failures 0/0; raw binary +0.005232%

Package and image size

Metric	Base	HEAD	Delta	Delta %
Raw binary	150.20 MiB	150.21 MiB	+8.05 KiB	+0.005232%
Stripped binary	103.28 MiB	103.29 MiB	+4.00 KiB	+0.003782%
gzip binary	51.58 MiB	51.59 MiB	+2.27 KiB	+0.004300%
Rootfs	157.11 MiB	157.11 MiB	0 B	0.00%
gzip rootfs	60.49 MiB	60.49 MiB	+2.66 KiB	+0.004296%

Startup latency and PSS

Case	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta
Serve ready	26.85 ms	26.83 ms	−0.02 ms	5.42 MiB	4.80 MiB	−637.50 KiB
CDP first page	49.58 ms	48.78 ms	−0.80 ms	4.87 MiB	4.86 MiB	−9.50 KiB
CDP warm page	12.51 ms	12.33 ms	−0.18 ms	50.38 MiB	49.70 MiB	−691.00 KiB
CLI about:blank	15.55 ms	15.30 ms	−0.25 ms	4.69 MiB	4.21 MiB	−492.00 KiB
CLI local JS	19.52 ms	19.45 ms	−0.07 ms	3.81 MiB	6.62 MiB	+2.80 MiB

Concurrency matrix

Concurrency	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta	HEAD failures	Unstable B/H
1	17.63 ms	17.74 ms	+0.12 ms	647.00 KiB	709.00 KiB	+62.00 KiB	0	0/0
5	20.16 ms	19.44 ms	−0.72 ms	13.72 MiB	27.60 MiB	+13.88 MiB	0	0/0
10	20.54 ms	21.16 ms	+0.62 ms	15.39 MiB	13.39 MiB	−2.00 MiB	0	0/0
25	21.23 ms	20.41 ms	−0.82 ms	22.94 MiB	18.40 MiB	−4.53 MiB	0	0/0
100	20.05 ms	20.13 ms	+0.08 ms	27.85 MiB	13.93 MiB	−13.92 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 42.39s

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	2.68 ms	23.75 ms
Chromium	8	8	47/47	245.97 ms	82.93 ms

Operation p50	Chromium	Moli	Delta	Delta %
navigate	46.28 ms	5.70 ms	−40.58 ms	−87.69%
observe	1.35 ms	1.06 ms	−0.29 ms	−21.50%
fill	3.47 ms	3.35 ms	−0.11 ms	−3.24%
click	3.06 ms	3.75 ms	+0.69 ms	+22.56%

Idle-resource episode	Peak RSS	Peak PSS	Average CPU	Peak CPU	Peak processes	Sampler
Moli	65.87 MiB	62.85 MiB	0.74%	8.05%	1	✅
Chromium	1275.89 MiB	347.86 MiB	0.59%	6.01%	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	17.41 ms	18.89 ms	754.00 KiB
Long-lived CDP session	13	0	17.36 ms	18.25 ms	—

CDP smoke — ✅ 52/52 groups passed; 622 scenarios

Workers: 4 · cumulative group time: 139.29 s · failed groups: 0

Slowest group	Scenarios	Duration	Status
scrollbar-visibility	22	14.84 s	✅
target-lifecycle	24	10.69 s	✅
chromium-cdp	56	9.41 s	✅
dom-input	27	8.99 s	✅
multi-page	45	7.76 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 cdb102cdc6 → HEAD 60d0c77b2c; benchmark order: base-first; workflow: success.

Session resilience

Metric	Base	HEAD
Attempted / planned	200 / 200	200 / 200
Direct observable pass	197 / 200	198 / 200
Failures / recovered	3 / 3	2 / 2
Recovery failures	0	0
Lifecycle order violations	0	0
Network order violations	0	0
Wall time	577.2 s	502.8 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	269.0 MiB	245.1 MiB	-23.9 MiB
Periodic peak PSS	265.4 MiB	241.1 MiB	-24.3 MiB
RSS · first 10 avg	179.2 MiB	174.5 MiB	-4.7 MiB
RSS · last 10 avg	200.2 MiB	194.1 MiB	-6.1 MiB
RSS · last − first window	+21.0 MiB	+19.6 MiB	-1.4 MiB
RSS · warm slope / 100 nav	+11.4 MiB	+5.8 MiB	-5.6 MiB
PSS · first 10 avg	175.8 MiB	170.9 MiB	-4.9 MiB
PSS · last 10 avg	196.1 MiB	190.5 MiB	-5.6 MiB
PSS · last − first window	+20.3 MiB	+19.7 MiB	-0.6 MiB
PSS · warm slope / 100 nav	+11.3 MiB	+6.1 MiB	-5.2 MiB
Peak file descriptors	59	59	0
Peak threads	29	29	0

HEAD memory by 50-navigation quarter

HEAD range	Avg RSS	Final RSS	Peak RSS	Avg PSS	Final PSS	Peak FD
1–50	180.4 MiB	151.3 MiB	225.8 MiB	176.5 MiB	147.2 MiB	53
51–100	192.2 MiB	206.6 MiB	222.9 MiB	188.4 MiB	202.9 MiB	53
101–150	195.5 MiB	186.4 MiB	229.8 MiB	191.8 MiB	182.8 MiB	55
151–200	190.7 MiB	135.2 MiB	235.0 MiB	187.1 MiB	131.6 MiB	53

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.

[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 cdb102cdc607 → HEAD 60d0c77b2ca6; benchmark order: base-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: 36; HTTP error + rows: 2; empty: 7; HTTP error + empty: 1; snapshot error + empty: 2	extracted: 37; HTTP error + rows: 1; empty: 7; HTTP error + empty: 1; snapshot error + empty: 2	—
Observed duration	44.88 s	38.19 s	-6.69 s (-14.91%)
Estimated CPU	39.63 s	36.86 s	-2.77 s (-6.98%)
Peak PSS	244.03 MiB	262.30 MiB	+18.27 MiB (+7.49%)
Peak RSS	247.87 MiB	265.90 MiB	+18.04 MiB (+7.28%)
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, 2.537, 4.039, 5.04, 6.54, 7.542, 9.043, 10.044, 11.544, 12.545, 14.048, 15.05, 16.551, 17.552, 19.054, 20.056, 21.559, 22.561, 24.062, 25.062, 26.565, 27.567, 29.07, 30.071, 31.573, 32.575, 34.078, 35.078, 36.58, 37.582, 38.083, 39.084, 40.086, 41.086, 41.587, 42.588, 44.09]
    y-axis "CPU percent" 0 --> 200
    line [17.99, 127.9, 123.9, 137.87, 120, 102.04, 149.72, 56.01, 61.97, 110.02, 33.94, 2, 101.87, 69.96, 59.92, 61.93, 105.76, 129.71, 109.83, 131.84, 150.08, 35.93, 107.76, 135.7, 105.93, 85.95, 5.99, 127.8, 101.97, 111.92, 7.98, 0, 27.99, 135.86, 169.82, 13.96, 87.89, 111.92]

Loading

xychart-beta
    title "Base memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.035, 1.036, 1.536, 2.537, 4.039, 5.04, 6.54, 7.542, 9.043, 10.044, 11.544, 12.545, 14.048, 15.05, 16.551, 17.552, 19.054, 20.056, 21.559, 22.561, 24.062, 25.062, 26.565, 27.567, 29.07, 30.071, 31.573, 32.575, 34.078, 35.078, 36.58, 37.582, 38.083, 39.084, 40.086, 41.086, 41.587, 42.588, 44.09, 44.878]
    y-axis "Memory MiB" 0 --> 500
    line [13.1, 73.02, 97.77, 99.07, 143.88, 156.78, 116.35, 137.09, 126.36, 143.11, 124.86, 136.96, 120.55, 142.96, 115.91, 119.4, 154.31, 131.84, 163.75, 247.87, 187.91, 200.99, 143.55, 162.93, 142.85, 137.05, 146.42, 135.61, 203.24, 229.11, 148.72, 129.26, 129.06, 137.99, 165.2, 155.91, 127.28, 145.46, 162.6, 0]
    line [9.89, 69.83, 94.51, 95.72, 140.53, 153.52, 112.92, 134.07, 122.77, 139.68, 121.46, 133.56, 117.13, 139.54, 112.49, 115.98, 150.88, 128.49, 160.43, 244.03, 184.42, 197.5, 140.16, 159.54, 139, 133.41, 143.03, 131.97, 199.54, 224.91, 145.08, 125.62, 125.42, 133.92, 161.59, 152.3, 123.64, 141.82, 156.28, 0]

Loading

HEAD

xychart-beta
    title "HEAD CPU"
    x-axis "Elapsed seconds" [0.536, 1.037, 2.038, 3.039, 4.041, 4.542, 5.042, 5.542, 6.543, 7.543, 8.545, 9.547, 10.547, 12.05, 13.052, 14.054, 15.056, 16.057, 17.059, 18.06, 19.561, 20.562, 21.563, 22.564, 23.565, 24.565, 25.566, 26.568, 28.069, 29.071, 30.071, 31.073, 32.075, 33.074, 34.076, 35.578, 36.579, 37.579]
    y-axis "CPU percent" 0 --> 200
    line [4, 17.96, 101.93, 113.83, 137.8, 129.71, 125.9, 129.98, 119.79, 134, 117.76, 129.73, 103.95, 85.84, 113.76, 41.92, 47.93, 147.83, 101.78, 107.93, 101.94, 121.85, 117.88, 125.87, 45.95, 120.21, 117.93, 87.77, 71.98, 59.87, 41.99, 109.77, 83.92, 9.99, 103.76, 161.89, 89.95, 123.93]

Loading

xychart-beta
    title "HEAD memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.036, 0.536, 1.037, 2.038, 3.039, 4.041, 4.542, 5.042, 5.542, 6.543, 7.543, 8.545, 9.547, 10.547, 12.05, 13.052, 14.054, 15.056, 16.057, 17.059, 18.06, 19.561, 20.562, 21.563, 22.564, 23.565, 24.565, 25.566, 26.568, 28.069, 29.071, 30.071, 31.073, 32.075, 33.074, 34.076, 35.578, 36.579, 37.579, 38.189]
    y-axis "Memory MiB" 0 --> 500
    line [13.12, 54.15, 76.13, 101.87, 123.61, 136.25, 132.79, 148.32, 134.45, 126.29, 133.07, 150.03, 161.35, 143.19, 124.8, 139.21, 114.57, 125.76, 151.85, 132.91, 139.38, 265.9, 185.03, 195.96, 211.98, 135.59, 155, 147.42, 132.49, 146.32, 143.13, 146.05, 193.8, 155.11, 128.07, 155.03, 136.81, 134.14, 151.18, 0]
    line [9.74, 50.66, 72.98, 98.36, 120.1, 132.75, 129.39, 144.72, 130.8, 123.12, 129.27, 146.42, 157.77, 139.59, 121.2, 135.61, 110.96, 122.15, 148.29, 129.31, 135.76, 262.3, 181.53, 192.39, 208.39, 131.86, 151.7, 143.85, 128.88, 142.77, 139.53, 142.45, 190.99, 151.5, 124.47, 150.93, 133.1, 130.74, 147.59, 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	19.86 s	19.86 s	+0.00 s (+0.02%)
Estimated CPU	0.40 s	0.46 s	+0.06 s (+14.39%)
Peak PSS	66.12 MiB	66.30 MiB	+0.19 MiB (+0.28%)
Peak RSS	69.59 MiB	69.73 MiB	+0.14 MiB (+0.20%)
Peak threads	18	19	+1 (+5.56%)
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.