www.cdc.gov: ウェブ標準とメタデータ — 第 2026-W40 週

ウェブ標準とメタデータ

ScanGov(方法論は CC0)の精神に基づくウェブ標準、メタデータ、セキュリティのチェック。ホームページだけでなく、私たちのスキャン全体にわたって実行します。

各標準に合格した確認済みページの割合(低い順)。
標準	合格率	ページ
schema.org GovernmentOrganization markup	0%	0/865
hreflang alternates declared	0%	0/865
Open social presence (Mastodon/Bluesky) linked	0%	0/865
Open Graph tags (0/6)	55%	475/865
Twitter card metadata	60%	523/865
Meta description present	66%	571/865
Canonical URL declared	73%	631/865
Character encoding declared	75%	653/865
Responsive viewport (zoom not disabled)	75%	652/865
Document language (lang) set	80%	696/865
Page has a <title>	100%	864/865

865 ページにわたって

確認したページで Mastodon/Bluesky のリンクは検出されませんでした。

Progressive Web Resilience 865 ページにわたって

Capabilities that keep the site useful under real-world conditions — unreliable connectivity, interrupted sessions, mobile install. Not a compliance score: each row is independent evidence.

Progressive Web Resilience signals (lowest pass rate first).
Capability	結果	Why it matters	証拠
Service worker registered	✗ 0/865 pages	A service worker is what makes offline access, caching, and background sync possible.	—
Manifest declares a maskable icon	✗ 0/865 pages	A maskable icon lets the OS safely crop/mask the app icon on different device shapes without clipping content.	No icon with purpose "maskable"
Service worker is active (not just registered)	✗ 0/865 pages	An active service worker (not just registered) is what actually intercepts requests and serves cached content.	—
Service worker controls this page load	✗ 0/865 pages	A controlling service worker means THIS page load is being served/intercepted, not just a future one.	—
Meets basic installability criteria	✗ 0/865 pages	Determines whether the browser can realistically offer "Add to Home Screen" / install, based on manifest + service worker + HTTPS together.	no service worker registered
Web app manifest declared	~ 649/865 pages	A web app manifest is required for installability and controls how the app appears when launched.	—
Theme color declared	~ 649/865 pages	Theme color controls the browser chrome/status-bar color when the site is installed or bookmarked.	#0056b3
Apple touch icon (iOS/bookmark icon)	~ 649/865 pages	iOS uses this icon for home-screen bookmarks and "Add to Home Screen" — without it the icon falls back to a screenshot.	—
Manifest fetched and parsed successfully	~ 649/865 pages	A manifest that fails to parse cannot drive installability or launch behavior even if the link is present.	display=standalone, start_url=unset
HTTPS (required for service workers)	✓ 865/865 pages	HTTPS is required for service workers and most install prompts.	—