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fix(webidl): implement WindowProperties exotic methods - #537

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@ldm0 ldm0 commented Sep 13, 2026

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Source: 350f374

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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 ca14f3193faf → HEAD 4bc6f9859db6; benchmark order: base-first; workflow: success.

Public 48-site run · informational

Metric Base HEAD Δ
Run status success success —
Extracted rows / contract 189 / 240 184 / 240 -5 (-2.65%)
Contract fill 78.75% 76.67% -2.08 pp (-2.64%)
Sites with rows 39 / 48 38 / 48 -1 (-2.56%)
Sites meeting row contract 37 / 48 36 / 48 -1 (-2.70%)
Unexpected empty sites 9 10 +1 (+11.11%)
Partial-row sites 2 2 0 (0.00%)
Site outcomes extracted: 37; HTTP error + rows: 2; empty: 7; HTTP error + empty: 1; snapshot error + empty: 1 extracted: 37; HTTP error + rows: 1; empty: 7; HTTP error + empty: 1; snapshot error + empty: 2 —
Observed duration 45.19 s 49.70 s +4.51 s (+9.99%)
Estimated CPU 41.31 s 42.96 s +1.65 s (+3.99%)
Peak PSS 197.20 MiB 193.76 MiB -3.44 MiB (-1.74%)
Peak RSS 200.66 MiB 197.52 MiB -3.15 MiB (-1.57%)
Peak threads 26 26 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 35 / 40 30 / 40 -5

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, 4.043, 5.044, 6.547, 7.548, 9.051, 10.051, 11.553, 12.553, 14.055, 15.057, 16.057, 16.558, 17.558, 19.058, 20.059, 21.561, 23.062, 24.063, 25.565, 26.065, 26.566, 28.067, 29.067, 30.569, 31.571, 33.072, 34.073, 35.575, 36.576, 38.077, 39.079, 40.58, 41.582, 43.083, 44.084, 44.584]
    y-axis "CPU percent" 0 --> 500
    line [125.75, 121.8, 3.99, 93.92, 163.6, 125.91, 171.63, 103.96, 139.96, 69.97, 139.92, 135.74, 0, 8, 93.99, 96, 13.97, 6, 107.87, 119.97, 119.83, 113.82, 107.86, 113.89, 125.95, 143.91, 23.95, 83.91, 8, 83.79, 91.93, 2, 9.97, 133.91, 181.56, 109.97, 119.92, 213.68]
Loading 
xychart-beta
    title "Base memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.036, 1.538, 2.54, 4.043, 5.044, 6.547, 7.548, 9.051, 10.051, 11.553, 12.553, 14.055, 15.057, 16.057, 16.558, 17.558, 19.058, 20.059, 21.561, 23.062, 24.063, 25.565, 26.065, 26.566, 28.067, 29.067, 30.569, 31.571, 33.072, 34.073, 35.575, 36.576, 38.077, 39.079, 40.58, 41.582, 43.083, 44.084, 44.584, 45.189]
    y-axis "Memory MiB" 0 --> 500
    line [12.18, 94.95, 112.6, 106.48, 113.17, 160.53, 179.55, 168.95, 185.53, 177.66, 174.89, 180.87, 173.3, 165.09, 143.3, 148.25, 162.43, 157.7, 148.49, 185.14, 167.32, 186.56, 200.66, 187.86, 164.74, 168.28, 172.87, 145.55, 148.68, 144.94, 175.9, 161.22, 151.71, 143.82, 180.14, 158.45, 156.38, 178.3, 190.9, 0]
    line [8.79, 91.29, 109.03, 102.77, 109.51, 156.81, 175.81, 165.11, 181.88, 173.86, 171.07, 177.27, 169.68, 161.29, 139.52, 144.45, 159.2, 153.9, 144.69, 181.29, 163.52, 182.79, 197.2, 184.1, 160.93, 164.36, 169.05, 141.76, 144.9, 141.14, 171.98, 157.42, 147.92, 140.02, 176.36, 154.65, 152.63, 174.68, 184.79, 0]
Loading

HEAD

xychart-beta
    title "HEAD CPU"
    x-axis "Elapsed seconds" [1.537, 2.538, 4.041, 5.042, 5.542, 7.044, 8.045, 9.546, 11.049, 12.051, 13.552, 15.054, 16.055, 17.555, 19.058, 20.559, 21.56, 23.06, 24.563, 25.565, 27.067, 28.567, 29.569, 31.07, 32.572, 34.074, 35.074, 36.576, 38.078, 39.079, 40.579, 42.081, 43.083, 44.586, 46.087, 47.589, 48.59, 49.09]
    y-axis "CPU percent" 0 --> 500
    line [129.75, 117.89, 111.95, 175.77, 138, 155.63, 137.92, 133.95, 81.84, 133.87, 118.05, 57.96, 2, 19.99, 8, 113.84, 103.81, 15.98, 7.98, 0, 47.94, 87.97, 45.96, 112.02, 145.78, 117.67, 115.92, 111.9, 47.97, 113.94, 23.98, 133.82, 93.75, 27.92, 127.85, 83.96, 109.9, 207.72]
Loading 
xychart-beta
    title "HEAD memory: RSS then PSS"
    x-axis "Elapsed seconds" [0.035, 1.537, 2.538, 4.041, 5.042, 5.542, 7.044, 8.045, 9.546, 11.049, 12.051, 13.552, 15.054, 16.055, 17.555, 19.058, 20.559, 21.56, 23.06, 24.563, 25.565, 27.067, 28.567, 29.569, 31.07, 32.572, 34.074, 35.074, 36.576, 38.078, 39.079, 40.579, 42.081, 43.083, 44.586, 46.087, 47.589, 48.59, 49.09, 49.703]
    y-axis "Memory MiB" 0 --> 500
    line [12.14, 98.3, 113.98, 131.9, 155.23, 175.96, 164.11, 181.48, 162.91, 189.74, 195.97, 160.36, 181.05, 172.82, 142.91, 143.54, 160.45, 151.94, 147.41, 142.69, 140.39, 137.78, 164.05, 159.8, 181.54, 149.91, 157.74, 187.01, 145.34, 147.29, 152.5, 148.57, 168.75, 181.66, 159.89, 169.73, 162.01, 176.83, 197.52, 0]
    line [8.86, 94.65, 110.44, 128.18, 151.69, 172.19, 160.56, 177.89, 159.08, 183.37, 192.19, 156.58, 177.35, 169.04, 139.12, 139.76, 156.66, 148.15, 143.62, 138.9, 136.6, 133.99, 160.29, 153.72, 177.73, 146.14, 153.94, 183.24, 141.53, 143.49, 148.72, 144.77, 164.95, 177.85, 156.63, 164.67, 158.27, 173.09, 193.76, 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 19.97 s 19.88 s -0.09 s (-0.47%)
Estimated CPU 0.40 s 0.43 s +0.03 s (+7.21%)
Peak PSS 57.07 MiB 56.91 MiB -0.16 MiB (-0.28%)
Peak RSS 60.76 MiB 60.63 MiB -0.13 MiB (-0.21%)
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

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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 +0.006001%
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 ✅ 48/48 groups passed; 535 scenarios
Release regression — ✅ HEAD/base failures 0/0; raw binary +0.006001%

Package and image size

Metric Base HEAD Delta Delta %
Raw binary 149.38 MiB 149.39 MiB +9.18 KiB +0.006001%
Stripped binary 103.70 MiB 103.71 MiB +8.00 KiB +0.007534%
gzip binary 50.27 MiB 50.27 MiB +2.59 KiB +0.005024%
Rootfs 156.28 MiB 156.29 MiB +10.00 KiB +0.006249%
gzip rootfs 59.09 MiB 59.09 MiB +1.68 KiB +0.002781%

Startup latency and PSS

Case Base p50 HEAD p50 Delta Base PSS HEAD PSS Delta
Serve ready 27.13 ms 27.16 ms +0.04 ms 4.41 MiB 4.14 MiB −268.50 KiB
CDP first page 50.92 ms 51.93 ms +1.02 ms 4.50 MiB 3.69 MiB −827.50 KiB
CDP warm page 12.41 ms 13.69 ms +1.27 ms 49.25 MiB 48.24 MiB −1.01 MiB
CLI about:blank 14.25 ms 14.63 ms +0.38 ms 3.83 MiB 2.58 MiB −1.25 MiB
CLI local JS 17.47 ms 18.14 ms +0.67 ms 3.04 MiB 2.30 MiB −758.00 KiB

Concurrency matrix

Concurrency Base p50 HEAD p50 Delta Base PSS HEAD PSS Delta HEAD failures Unstable B/H
1 17.70 ms 17.17 ms −0.53 ms 606.00 KiB 638.00 KiB +32.00 KiB 0 0/0
5 22.10 ms 21.12 ms −0.98 ms 14.79 MiB 11.92 MiB −2.88 MiB 0 0/0
10 20.83 ms 19.60 ms −1.23 ms 12.57 MiB 26.83 MiB +14.26 MiB 0 0/0
25 22.23 ms 20.90 ms −1.33 ms 13.89 MiB 26.73 MiB +12.84 MiB 0 0/0
100 19.47 ms 19.58 ms +0.10 ms 12.46 MiB 26.96 MiB +14.50 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 39.30s
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 3.22 ms 25.99 ms
Chromium 8 8 47/47 251.33 ms 89.34 ms
Operation p50 Chromium Moli Delta Delta %
navigate 41.30 ms 6.95 ms −34.35 ms −83.17%
observe 1.27 ms 0.92 ms −0.35 ms −27.32%
fill 2.74 ms 3.29 ms +0.55 ms +19.98%
click 3.17 ms 3.77 ms +0.60 ms +18.83%
Idle-resource episode Peak RSS Peak PSS Average CPU Peak CPU Peak processes Sampler
Moli 63.88 MiB 61.78 MiB 0.69% 10.00% 1 ✅
Chromium 1124.92 MiB 352.27 MiB 1.97% 88.15% 13 ✅
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 17.26 ms 17.51 ms 464.00 KiB
Long-lived CDP session 13 0 19.83 ms 20.58 ms —
CDP smoke — ✅ 48/48 groups passed; 535 scenarios

Workers: 4 · cumulative group time: 148.63 s · failed groups: 0

Slowest group Scenarios Duration Status
target-lifecycle 24 16.79 s ✅
chromium-cdp 56 12.66 s ✅
multi-page 45 11.08 s ✅
dom-input 27 10.56 s ✅
layout-screenshot 5 7.63 s ✅

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

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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 ca14f3193f → HEAD 4bc6f9859d; 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 279.4 s 286.9 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 211.5 MiB 212.5 MiB +1.1 MiB
Periodic peak PSS 207.7 MiB 209.5 MiB +1.8 MiB
RSS · first 10 avg 145.4 MiB 148.8 MiB +3.4 MiB
RSS · last 10 avg 167.3 MiB 166.4 MiB -0.9 MiB
RSS · last − first window +21.9 MiB +17.6 MiB -4.3 MiB
RSS · warm slope / 100 nav +2.5 MiB +3.2 MiB +0.7 MiB
PSS · first 10 avg 142.0 MiB 145.1 MiB +3.0 MiB
PSS · last 10 avg 163.6 MiB 163.3 MiB -0.4 MiB
PSS · last − first window +21.6 MiB +18.2 MiB -3.4 MiB
PSS · warm slope / 100 nav +2.4 MiB +3.5 MiB +1.1 MiB
Peak file descriptors 62 62 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
1–50 160.1 MiB 149.0 MiB 206.1 MiB 156.4 MiB 145.3 MiB 51
51–100 162.9 MiB 138.6 MiB 209.7 MiB 159.2 MiB 135.1 MiB 54
101–150 165.5 MiB 150.0 MiB 197.0 MiB 162.0 MiB 146.4 MiB 51
151–200 167.3 MiB 146.1 MiB 207.2 MiB 164.1 MiB 142.9 MiB 52

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.

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