fix(canvas): expose branded readonly TextMetrics width

[ldm0]

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[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 4c00e6dab6 → HEAD 2439ebcbba; benchmark order: base-first; workflow: success.

Session resilience

Metric	Base	HEAD
Attempted / planned	200 / 200	200 / 200
Direct observable pass	200 / 200	200 / 200
Failures / recovered	0 / 0	0 / 0
Recovery failures	0	0
Lifecycle order violations	0	0
Network order violations	0	0
Wall time	272.2 s	270.9 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	219.8 MiB	211.1 MiB	-8.7 MiB
Periodic peak PSS	216.8 MiB	207.5 MiB	-9.2 MiB
RSS · first 10 avg	163.5 MiB	146.2 MiB	-17.3 MiB
RSS · last 10 avg	156.6 MiB	157.8 MiB	+1.2 MiB
RSS · last − first window	-6.9 MiB	+11.6 MiB	+18.5 MiB
RSS · warm slope / 100 nav	+3.8 MiB	-0.5 MiB	-4.3 MiB
PSS · first 10 avg	160.1 MiB	142.5 MiB	-17.6 MiB
PSS · last 10 avg	153.0 MiB	154.1 MiB	+1.2 MiB
PSS · last − first window	-7.1 MiB	+11.6 MiB	+18.8 MiB
PSS · warm slope / 100 nav	+3.7 MiB	-0.5 MiB	-4.2 MiB
Peak file descriptors	60	60	0
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	157.9 MiB	150.0 MiB	212.2 MiB	154.2 MiB	146.4 MiB	50
51–100	158.2 MiB	140.9 MiB	194.1 MiB	154.7 MiB	137.3 MiB	56
101–150	158.2 MiB	153.0 MiB	194.3 MiB	154.7 MiB	149.4 MiB	50
151–200	159.3 MiB	143.0 MiB	198.3 MiB	155.7 MiB	139.4 MiB	50

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 4c00e6dab6ae → HEAD 2439ebcbbae7; 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	47.50 s	45.25 s	-2.25 s (-4.73%)
Estimated CPU	46.06 s	43.94 s	-2.11 s (-4.59%)
Peak PSS	188.29 MiB	205.39 MiB	+17.09 MiB (+9.08%)
Peak RSS	192.51 MiB	209.15 MiB	+16.64 MiB (+8.64%)
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	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" [1.033, 1.535, 2.535, 4.037, 5.541, 6.041, 6.542, 8.044, 9.046, 10.046, 10.547, 12.048, 13.05, 14.551, 16.052, 17.054, 18.556, 20.059, 21.06, 22.562, 24.062, 25.063, 26.566, 27.567, 29.071, 30.573, 31.575, 33.077, 34.578, 35.58, 37.082, 38.584, 39.585, 41.086, 42.086, 43.589, 45.091, 46.092]
    y-axis "CPU percent" 0 --> 500
    line [59.99, 109.7, 93.9, 109.88, 211.52, 271.75, 159.6, 147.9, 95.82, 181.82, 197.8, 75.94, 129.9, 140.03, 0, 51.91, 51.89, 23.95, 34, 67.92, 115.95, 233.72, 103.91, 115.75, 59.85, 135.6, 169.54, 51.94, 79.81, 23.98, 119.83, 15.99, 4, 10, 131.89, 181.84, 75.93, 101.85]

Loading

xychart-beta
    title "Base memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.033, 1.033, 1.535, 2.535, 4.037, 5.541, 6.041, 6.542, 8.044, 9.046, 10.046, 10.547, 12.048, 13.05, 14.551, 16.052, 17.054, 18.556, 20.059, 21.06, 22.562, 24.062, 25.063, 26.566, 27.567, 29.071, 30.573, 31.575, 33.077, 34.578, 35.58, 37.082, 38.584, 39.585, 41.086, 42.086, 43.589, 45.091, 46.092, 47.5]
    y-axis "Memory MiB" 0 --> 500
    line [12.3, 90.98, 105.06, 112.86, 141.16, 174.34, 164.45, 159.31, 169.12, 165.07, 192.51, 168.96, 157.9, 179.42, 174.39, 155.98, 140.98, 136.38, 149.55, 140.52, 154.43, 165.13, 165.5, 187.88, 172.43, 145.2, 168.16, 167.14, 149.89, 154.95, 152.54, 162.4, 159.46, 152.55, 147.2, 180.76, 165.11, 162.51, 173.29, 0]
    line [9.16, 87.26, 101.35, 109.14, 137.55, 170.88, 160.83, 155.69, 165.46, 161.43, 188.29, 165.34, 154.27, 175.8, 170.57, 152.21, 137.29, 132.59, 145.76, 136.72, 150.49, 161.37, 161.44, 184.16, 168.76, 141.43, 163.53, 163.4, 146.13, 151.13, 148.68, 158.65, 155.72, 148.71, 143.15, 177.21, 161.27, 158.55, 170.08, 0]

Loading

HEAD

xychart-beta
    title "HEAD CPU"
    x-axis "Elapsed seconds" [1.035, 1.536, 2.537, 3.538, 4.038, 5.039, 6.542, 7.543, 9.044, 10.045, 11.547, 12.549, 14.05, 15.052, 16.554, 17.554, 19.056, 20.058, 21.561, 23.063, 24.064, 25.564, 26.065, 26.566, 28.067, 29.069, 30.57, 31.571, 33.072, 34.074, 35.575, 36.577, 38.079, 39.08, 40.583, 41.584, 43.086, 44.088]
    y-axis "CPU percent" 0 --> 500
    line [59.95, 107.85, 2, 126.01, 142.01, 115.74, 241.81, 5.99, 175.81, 161.92, 213.82, 135.92, 101.92, 125.94, 63.97, 79.98, 67.87, 25.94, 147.69, 127.9, 147.92, 109.86, 107.79, 121.85, 115.93, 97.95, 95.89, 27.99, 107.89, 8, 117.7, 91.76, 6, 0, 137.83, 115.73, 61.9, 109.73]

Loading

xychart-beta
    title "HEAD memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.035, 1.035, 1.536, 2.537, 3.538, 4.038, 5.039, 6.542, 7.543, 9.044, 10.045, 11.547, 12.549, 14.05, 15.052, 16.554, 17.554, 19.056, 20.058, 21.561, 23.063, 24.064, 25.564, 26.065, 26.566, 28.067, 29.069, 30.57, 31.571, 33.072, 34.074, 35.575, 36.577, 38.079, 39.08, 40.583, 41.584, 43.086, 44.088, 45.253]
    y-axis "Memory MiB" 0 --> 500
    line [12.27, 90.66, 103.85, 93.98, 123.53, 136.05, 144.26, 159.24, 165.45, 163.61, 151.56, 182.36, 168.2, 182.11, 170.64, 157.62, 165.36, 147.96, 137.29, 165.87, 165.9, 156.64, 177.21, 209.15, 150.12, 154.06, 191.74, 148.55, 146.74, 153.17, 153.52, 191.33, 165.37, 150.37, 142.16, 159.78, 151.77, 154.96, 172.51, 0]
    line [8.91, 86.96, 100.16, 90.27, 119.76, 131.89, 139.86, 155.53, 161.75, 159.88, 148.31, 178.6, 164.49, 178.37, 166.88, 154.33, 159.07, 144.37, 133.57, 162.32, 162.14, 152.92, 173.54, 205.39, 146.86, 150.33, 188.09, 144.81, 143, 149.42, 149.84, 187.46, 161.77, 146.67, 138.47, 156.11, 148.21, 151.27, 168.81, 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	19.87 s	19.88 s	+0.01 s (+0.07%)
Estimated CPU	0.40 s	0.42 s	+0.02 s (+4.99%)
Peak PSS	57.34 MiB	57.40 MiB	+0.06 MiB (+0.10%)
Peak RSS	61.05 MiB	60.86 MiB	-0.18 MiB (-0.30%)
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: 5/5

Check	Status	Signal
Release regression	✅	HEAD/base failures 0/0; raw binary +0.002737%
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	✅	44/44 groups passed; 457 scenarios

Release regression — ✅ HEAD/base failures 0/0; raw binary +0.002737%

Package and image size

Metric	Base	HEAD	Delta	Delta %
Raw binary	149.13 MiB	149.14 MiB	+4.18 KiB	+0.002737%
Stripped binary	103.39 MiB	103.39 MiB	+4.00 KiB	+0.003778%
gzip binary	50.17 MiB	50.17 MiB	−113 B	−0.000215%
Rootfs	156.04 MiB	156.04 MiB	0 B	0.00%
gzip rootfs	58.99 MiB	58.99 MiB	−593 B	−0.000959%

Startup latency and PSS

Case	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta
Serve ready	27.16 ms	27.19 ms	+0.03 ms	4.02 MiB	4.64 MiB	+637.00 KiB
CDP first page	50.31 ms	51.75 ms	+1.44 ms	3.49 MiB	3.86 MiB	+386.00 KiB
CDP warm page	13.10 ms	13.70 ms	+0.60 ms	48.59 MiB	49.05 MiB	+473.00 KiB
CLI about:blank	13.43 ms	13.94 ms	+0.51 ms	3.47 MiB	3.88 MiB	+422.00 KiB
CLI local JS	17.22 ms	17.90 ms	+0.69 ms	3.60 MiB	5.28 MiB	+1.68 MiB

Concurrency matrix

Concurrency	Base p50	HEAD p50	Delta	Base PSS	HEAD PSS	Delta	HEAD failures	Unstable B/H
1	16.07 ms	16.18 ms	+0.11 ms	1.06 MiB	1.11 MiB	+48.00 KiB	0	0/0
5	18.19 ms	19.38 ms	+1.19 ms	27.91 MiB	12.68 MiB	−15.23 MiB	0	0/0
10	18.33 ms	19.85 ms	+1.51 ms	13.84 MiB	13.60 MiB	−249.00 KiB	0	0/0
25	18.18 ms	18.37 ms	+0.19 ms	15.31 MiB	27.39 MiB	+12.07 MiB	0	0/0
100	18.45 ms	19.71 ms	+1.26 ms	14.76 MiB	27.31 MiB	+12.56 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 20.42s

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	3.14 ms	25.73 ms
Chromium	8	8	47/47	230.56 ms	78.77 ms

Operation p50	Chromium	Moli	Delta	Delta %
navigate	38.93 ms	7.29 ms	−31.65 ms	−81.28%
observe	0.89 ms	0.98 ms	+0.09 ms	+10.04%
fill	3.36 ms	3.09 ms	−0.27 ms	−8.02%
click	4.39 ms	3.57 ms	−0.82 ms	−18.73%

Idle-resource episode	Peak RSS	Peak PSS	Average CPU	Peak CPU	Peak processes	Sampler
Moli	63.39 MiB	60.70 MiB	0.63%	10.01%	1	✅
Chromium	1284.73 MiB	331.96 MiB	1.76%	89.67%	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	15.85 ms	16.73 ms	678.00 KiB
Long-lived CDP session	13	0	19.29 ms	19.78 ms	—

CDP smoke — ✅ 44/44 groups passed; 457 scenarios

Workers: 4 · cumulative group time: 126.25 s · failed groups: 0

Slowest group	Scenarios	Duration	Status
chromium-cdp	56	12.57 s	✅
multi-page	45	10.94 s	✅
dom-input	26	10.55 s	✅
layout-screenshot	5	7.50 s	✅
core	35	7.24 s	✅

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