fix(dom): initialize media state from defaults when cloning

[ldm0]

Media elements previously started with an explicit unmuted preference and copied live playback controls into clones. Keep the default mute state distinct from an explicit IDL setter, so the unnamespaced muted content attribute applies until the setter records a preference.

Clones and imports retain fresh playback state while copying content attributes. Cover audio/video, equal-value explicit setters, local and foreign imports, and template cloning; assert that the original element's controls stay unchanged.

Validation:

• Matched clone/import state against real Chromium for audio/video with and without the muted attribute.
• cargo fmt --all
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo nextest run --no-fail-fast: 20,249 passed, 18 skipped.

The updated legacy clone assertion now checks the Chromium-compatible initial controls and retains explicit checks of the source controls. HTML's media-state definitions: https://html.spec.whatwg.org/multipage/media.html#media-elements

Based directly on main; no prerequisite PRs.

[github-actions]

Spider Bench A/B

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

Public HEAD: 189 / 240 rows; 39 / 48 sites produced rows; 9 unexpected empty sites.

✅ Deterministic fixture contract is clean.

Common ancestor 468533ced256 → HEAD 3c88a8502f47; benchmark order: base-first; workflow: success.

Public 48-site run · informational

Metric	Base	HEAD	Δ
Run status	success	success	—
Extracted rows / contract	184 / 240	189 / 240	+5 (+2.72%)
Contract fill	76.67%	78.75%	+2.08 pp (+2.71%)
Sites with rows	38 / 48	39 / 48	+1 (+2.63%)
Sites meeting row contract	36 / 48	37 / 48	+1 (+2.78%)
Unexpected empty sites	10	9	-1 (-10.00%)
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: 38; HTTP error + rows: 1; empty: 6; HTTP error + empty: 1; snapshot error + empty: 2	—
Observed duration	51.41 s	48.33 s	-3.08 s (-6.00%)
Estimated CPU	51.04 s	52.45 s	+1.41 s (+2.76%)
Peak PSS	280.85 MiB	272.86 MiB	-7.99 MiB (-2.85%)
Peak RSS	284.56 MiB	276.84 MiB	-7.72 MiB (-2.71%)
Peak threads	27	27	0 (0.00%)
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	32 / 40	+5
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" [1.538, 2.54, 3.041, 4.043, 4.544, 5.546, 6.547, 7.048, 8.549, 10.05, 11.551, 13.053, 14.555, 15.555, 17.056, 18.557, 20.059, 21.561, 23.063, 24.565, 26.067, 27.069, 28.571, 30.073, 31.573, 33.074, 34.576, 36.079, 37.079, 38.581, 40.083, 41.585, 43.086, 44.589, 46.09, 47.091, 48.594, 50.096]
    y-axis "CPU percent" 0 --> 500
    line [105.73, 133.79, 127.74, 121.76, 111.82, 187.53, 145.85, 161.86, 125.89, 201.87, 91.95, 53.92, 147.87, 6, 0, 6, 119.83, 83.98, 33.96, 149.82, 79.94, 123.9, 105.83, 130.01, 131.96, 67.9, 125.83, 137.72, 100.04, 113.87, 27.98, 151.83, 101.87, 11.98, 43.94, 131.78, 31.95, 139.82]

Loading

xychart-beta
    title "Base memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.036, 1.538, 2.54, 3.041, 4.043, 4.544, 5.546, 6.547, 7.048, 8.549, 10.05, 11.551, 13.053, 14.555, 15.555, 17.056, 18.557, 20.059, 21.561, 23.063, 24.565, 26.067, 27.069, 28.571, 30.073, 31.573, 33.074, 34.576, 36.079, 37.079, 38.581, 40.083, 41.585, 43.086, 44.589, 46.09, 47.091, 48.594, 50.096, 51.41]
    y-axis "Memory MiB" 0 --> 500
    line [12.19, 102.32, 119.8, 132.7, 169.39, 145.88, 157.35, 179.35, 180.78, 165.86, 179.16, 147.23, 174.35, 167.59, 146.48, 144.18, 144.65, 176.49, 150.5, 157.57, 173.88, 164.97, 167.54, 284.56, 214.6, 218.69, 157.4, 192.23, 176.48, 155.32, 168.22, 157.96, 204.9, 164.08, 178.43, 173.83, 198.95, 155.31, 179.1, 0]
    line [8.81, 98.53, 116.16, 129.01, 165.54, 142.15, 154.08, 175.58, 177.01, 161.76, 175.45, 143.3, 170.58, 163.91, 142.73, 140.23, 140.9, 173.2, 146.72, 153.79, 170.22, 161.25, 163.13, 280.85, 210.87, 214.94, 153.66, 188.63, 172.76, 151.59, 164.77, 153.63, 201.24, 160.35, 174.7, 170.2, 195.25, 151.58, 175.38, 0]

Loading

HEAD

xychart-beta
    title "HEAD CPU"
    x-axis "Elapsed seconds" [1.035, 1.537, 2.538, 4.04, 5.543, 6.545, 8.046, 9.548, 11.049, 12.05, 13.553, 15.054, 16.056, 17.558, 19.06, 20.061, 21.562, 23.064, 24.565, 25.567, 27.069, 28.07, 28.571, 29.574, 31.074, 32.576, 33.577, 35.08, 36.581, 37.582, 39.084, 40.586, 42.087, 43.089, 44.592, 46.095, 47.097, 48.097]
    y-axis "CPU percent" 0 --> 500
    line [2, 83.79, 125.83, 147.72, 185.86, 149.59, 141.86, 189.73, 65.95, 105.87, 149.76, 113.9, 23.98, 11.98, 9.99, 135.88, 71.94, 71.92, 117.86, 125.85, 139.62, 101.85, 111.79, 135.73, 143.88, 66.06, 131.78, 145.8, 110.04, 97.86, 11.99, 137.95, 53.93, 11.97, 125.74, 57.94, 129.79, 193.94]

Loading

xychart-beta
    title "HEAD memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.035, 1.035, 1.537, 2.538, 4.04, 5.543, 6.545, 8.046, 9.548, 11.049, 12.05, 13.553, 15.054, 16.056, 17.558, 19.06, 20.061, 21.562, 23.064, 24.565, 25.567, 27.069, 28.07, 28.571, 29.574, 31.074, 32.576, 33.577, 35.08, 36.581, 37.582, 39.084, 40.586, 42.087, 43.089, 44.592, 46.095, 47.097, 48.097, 48.328]
    y-axis "Memory MiB" 0 --> 500
    line [12.23, 62.63, 94.56, 127.46, 148, 150.16, 175.04, 173.52, 177.43, 169.1, 182.29, 195.52, 165.26, 167.42, 179.83, 151.44, 158.24, 175.45, 155.69, 188.35, 160.52, 182.04, 276.84, 249.82, 212.57, 217.45, 162.93, 179.52, 168.54, 162.93, 158.91, 158.86, 211.76, 182.97, 167.77, 183.97, 165.21, 192.84, 192.43, 0]
    line [8.94, 59, 90.87, 123.76, 144.35, 148.98, 172.24, 170.57, 173.71, 165.34, 179.37, 191.76, 161.57, 163.75, 176.07, 147.68, 154.63, 171.72, 151.93, 184.59, 156.8, 178.29, 272.86, 245.65, 208.59, 213.75, 159.99, 175.98, 164.89, 159.17, 155.16, 155.11, 208.32, 179.21, 164.01, 180.21, 161.44, 189.13, 188.88, 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	19.85 s	-0.00 s (-0.01%)
Estimated CPU	0.41 s	0.40 s	-0.01 s (-2.43%)
Peak PSS	66.74 MiB	66.56 MiB	-0.17 MiB (-0.26%)
Peak RSS	70.32 MiB	70.19 MiB	-0.13 MiB (-0.19%)
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]

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 468533ced2 → HEAD 3c88a8502f; benchmark order: base-first; workflow: success.

Session resilience

Metric	Base	HEAD
Attempted / planned	200 / 200	200 / 200
Direct observable pass	195 / 200	185 / 200
Failures / recovered	5 / 5	15 / 15
Recovery failures	0	0
Lifecycle order violations	0	0
Network order violations	0	0
Wall time	725.8 s	896.0 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	238.4 MiB	247.6 MiB	+9.2 MiB
Periodic peak PSS	235.1 MiB	244.8 MiB	+9.7 MiB
RSS · first 10 avg	176.3 MiB	172.8 MiB	-3.5 MiB
RSS · last 10 avg	172.6 MiB	173.2 MiB	+0.6 MiB
RSS · last − first window	-3.7 MiB	+0.4 MiB	+4.1 MiB
RSS · warm slope / 100 nav	+2.3 MiB	+1.9 MiB	-0.4 MiB
PSS · first 10 avg	173.4 MiB	169.5 MiB	-3.9 MiB
PSS · last 10 avg	169.0 MiB	169.5 MiB	+0.5 MiB
PSS · last − first window	-4.3 MiB	+0.0 MiB	+4.4 MiB
PSS · warm slope / 100 nav	+1.8 MiB	+1.8 MiB	+0.0 MiB
Peak file descriptors	64	63	-1
Peak threads	31	29	-2

HEAD memory by 50-navigation quarter

HEAD range	Avg RSS	Final RSS	Peak RSS	Avg PSS	Final PSS	Peak FD
1–50	174.0 MiB	160.7 MiB	212.9 MiB	170.8 MiB	157.3 MiB	57
51–100	176.6 MiB	174.1 MiB	204.8 MiB	173.2 MiB	170.9 MiB	59
101–150	177.0 MiB	134.9 MiB	205.8 MiB	173.8 MiB	131.7 MiB	59
151–200	177.3 MiB	169.1 MiB	209.0 MiB	173.9 MiB	165.5 MiB	59

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]

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 −0.002552%
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 −0.002552%

Package and image size

Metric	Base	HEAD	Delta	Delta %
Raw binary	153.09 MiB	153.08 MiB	−4.00 KiB	−0.002552%
Stripped binary	106.39 MiB	106.39 MiB	−4.00 KiB	−0.003672%
gzip binary	52.71 MiB	52.71 MiB	−717 B	−0.001297%
Rootfs	159.99 MiB	159.98 MiB	−10.00 KiB	−0.006104%
gzip rootfs	61.75 MiB	61.75 MiB	−812 B	−0.001254%

Startup latency and PSS

Case	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta
Serve ready	27.25 ms	27.16 ms	−0.09 ms	4.29 MiB	4.36 MiB	+71.50 KiB
CDP first page	50.35 ms	50.06 ms	−0.28 ms	4.44 MiB	4.51 MiB	+79.50 KiB
CDP warm page	11.70 ms	12.25 ms	+0.55 ms	50.79 MiB	50.64 MiB	−146.50 KiB
CLI about:blank	15.28 ms	14.39 ms	−0.89 ms	2.66 MiB	3.34 MiB	+696.00 KiB
CLI local JS	18.87 ms	18.60 ms	−0.27 ms	2.66 MiB	4.24 MiB	+1.58 MiB

Concurrency matrix

Concurrency	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta	HEAD failures	Unstable B/H
1	17.15 ms	17.36 ms	+0.21 ms	702.00 KiB	655.00 KiB	−47.00 KiB	0	0/0
5	19.90 ms	19.58 ms	−0.32 ms	18.64 MiB	18.56 MiB	−77.75 KiB	0	0/0
10	19.30 ms	19.82 ms	+0.52 ms	13.38 MiB	13.63 MiB	+249.00 KiB	0	0/0
25	20.66 ms	19.56 ms	−1.10 ms	27.91 MiB	27.69 MiB	−230.00 KiB	0	0/0
100	21.09 ms	19.56 ms	−1.53 ms	13.58 MiB	27.72 MiB	+14.14 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 30.90s

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	3.52 ms	23.96 ms
Chromium	8	8	47/47	361.98 ms	84.72 ms

Operation p50	Chromium	Moli	Delta	Delta %
navigate	40.95 ms	8.69 ms	−32.26 ms	−78.77%
observe	1.28 ms	0.87 ms	−0.42 ms	−32.46%
fill	3.41 ms	3.34 ms	−0.08 ms	−2.27%
click	4.82 ms	3.84 ms	−0.98 ms	−20.38%

Idle-resource episode	Peak RSS	Peak PSS	Average CPU	Peak CPU	Peak processes	Sampler
Moli	66.31 MiB	64.62 MiB	0.78%	9.99%	1	✅
Chromium	1291.38 MiB	415.92 MiB	2.35%	97.33%	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	17.73 ms	18.33 ms	576.00 KiB
Long-lived CDP session	13	0	18.23 ms	18.64 ms	—

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

Workers: 4 · cumulative group time: 186.36 s · failed groups: 0

Slowest group	Scenarios	Duration	Status
scrollbar-visibility	22	27.60 s	✅
target-lifecycle	24	15.23 s	✅
dom-input	27	12.32 s	✅
chromium-cdp	56	11.40 s	✅
multi-page	45	11.05 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.