vital-scans オープンな品質台帳

www.cdc.gov: Lighthouse — 第 2026-W40 週

Google Lighthouse(独自のヘッドレス Chrome)でサンプリングされた 166 ページ。スコアは 0〜100(高いほど良い)、指標は Core Web Vitals です。 ダウンロード: CSV(ページ別スコア) · JSON(AI 対応、推奨事項を含む) · 優先ページ CSV · 優先ページ JSON.

傾向

17 週間にわたる Lighthouse カテゴリスコア
パフォーマンス アクセシビリティ ベストプラクティス SEO W24W32W401000
週別の Lighthouse カテゴリスコア
週パフォーマンスアクセシビリティベストプラクティスSEO
2026-W2482100100100
2026-W257710096100
2026-W267810096100
2026-W2780100100100
2026-W288210096100
2026-W298210096100
2026-W308410096100
2026-W318210096100
2026-W328210096100
2026-W337710096100
2026-W347910096100
2026-W358310096100
2026-W368610096100
2026-W378010096100
2026-W388310096100
2026-W398099100100
2026-W4082100100100

History & Trends → Severity, Lighthouse and other measures across 17 weeks.

パフォーマンスへの影響

How far pages fall short of Google's "good" benchmarks: Largest Contentful Paint ≤ 2.5s and page weight ≤ 1.6 MB. Lower is better.

Avg extra LCP over 2.5s
3.5s 105/165 pages over
Avg extra weight over 1.6 MB
3.94 MB 142/193 pages over

Set page_loads_per_week for this target to also estimate total wasted time and data (the way daily-dap uses traffic counts).

サンプルページの中央値

パフォーマンス
82/100
アクセシビリティ
100/100
ベストプラクティス
100/100
SEO
100/100
エージェントによるブラウジング
94/100
Largest Contentful Paint(LCP)
3.0s
First Contentful Paint(FCP)
1.6s
Speed Index
4.3s
Total Blocking Time(合計ブロック時間)
0.2s
Cumulative Layout Shift(累積レイアウトシフト)
0.018

推奨事項

見出しスコアを超えて、Lighthouse が 166 件のサンプルページで指摘した問題。カテゴリ別にグループ化され、影響するページ数で順位付けされています。推定削減量(転送バイト数または読み込み時間)は、利用可能な場合は Lighthouse 自身の推定です。アクセシビリティ監査は意図的に省略されています。アクセシビリティページの axe-core の検出と重複するためです。

パフォーマンス

Lighthouse による パフォーマンス の推奨事項。影響を受けたサンプルページ順。
推奨事項ページ推定削減量
Reduce unused JavaScript 164/166 24.9 MB · 28.9s
JavaScript execution time 163/166 42.8s
Minimize main-thread work 159/166 37.1s
Network dependency tree 158/166 —
Use efficient cache lifetimes 148/166 418.6s
Time to Interactive 140/166 —
Render-blocking requests 126/166 77.8s
Reduce unused CSS 125/166 9.8 MB · 54.5s
Minify JavaScript 107/166 4.4 MB · 10.9s
Largest Contentful Paint 105/166 —
Font display 99/166 5.5s
Speed Index 99/166 —
Avoid multiple page redirects 90/166 70.8s
Improve image delivery 61/166 120.7s
Total Blocking Time 56/166 —
LCP request discovery 52/166 —
Max Potential First Input Delay 51/166 —
Layout shift culprits 50/166 —
First Contentful Paint 49/166 —
Forced reflow 26/166 —
Document request latency 16/166 1.4s
Legacy JavaScript 13/166 1.9s
Page prevented back/forward cache restoration 8/166 —
Initial server response time was short 4/166 0.3s
Minify CSS 2/166 30 KB

ベストプラクティス

Lighthouse による ベストプラクティス の推奨事項。影響を受けたサンプルページ順。
推奨事項ページ推定削減量
Browser errors were logged to the console 50/166 —
Serves images with low resolution 44/166 —
Page lacks the HTML doctype, thus triggering quirks-mode 40/166 —
Issues were logged in the `Issues` panel in Chrome Devtools 37/166 —
Does not use HTTPS 32/166 —
Displays images with incorrect aspect ratio 22/166 —
Charset declaration is missing or occurs too late in the HTML 19/166 —
Missing source maps for large first-party JavaScript 3/166 —

SEO

Lighthouse による SEO の推奨事項。影響を受けたサンプルページ順。
推奨事項ページ推定削減量
Document does not have a meta description 53/166 —
Image elements do not have `[alt]` attributes 32/166 —
Links do not have descriptive text 15/166 —
Links are not crawlable 2/166 —

エージェント対応(AI 対応度)

Lighthouse による エージェント対応(AI 対応度) の推奨事項。影響を受けたサンプルページ順。
推奨事項ページ推定削減量
WebMCP tools registered 165/166 —
WebMCP form coverage 165/166 —
WebMCP schemas are valid 165/166 —
llms.txt follows recommendations 165/166 —
Cumulative Layout Shift 52/166 —
Accessibility tree is not well-formed 39/166 —

エージェント対応スコアの意味

エージェント対応(AI 対応度)スコアは Google Lighthouse(13.4 以降)の新機能です。これは、人々が行政サービスを見つけて利用する方法をますます仲介するツールである AI エージェントとアシスタントにとって、ページがどれだけ機能するかを測定します。llms.txt ファイル(言語モデル向けの機械可読ガイド)、有効な構造化データ、エージェントが解析できる適切に構成されたアクセシビリティツリー、WebMCP のツール/フォームの記述などをチェックします。スコアが高いほど、AI アシスタントがそのページを理解し、市民に代わってタスクを正しく完了できる可能性が高まります。

これは実験的で進化中です。コンプライアンス要件ではなく、将来を見据えたシグナルとして扱ってください。 サンプルページの中央値: 94/100.

サンプルページで見つかった不足: WebMCP tools registered (165), WebMCP form coverage (165), WebMCP schemas are valid (165), llms.txt follows recommendations (165), Cumulative Layout Shift (52), Accessibility tree is not well-formed (39).

ページ別の結果

サンプルページごとの Lighthouse スコアと Core Web Vitals(2026-W40)。エージェント対応 = 実験的なエージェントブラウジングスコア。PWA / オフライン対応は標準タブで追跡されます(Lighthouse 12 以降は PWA カテゴリが削除されました)。 — 列見出しをクリックして並べ替え
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