www.cdc.gov: Web standards & metadata — week 2026-W30
Web standards & metadata
Web-standards, metadata, and security checks in the spirit of ScanGov (methodology CC0), run across our scan rather than only the homepage.
Share of checked pages passing each standard (lowest first).
Standard
Pass rate
Pages
schema.org GovernmentOrganization markup
0%
0/1476
hreflang alternates declared
0%
0/1476
Open social presence (Mastodon/Bluesky) linked
0%
0/1476
Twitter card metadata
58%
859/1476
Open Graph tags (6/6)
59%
864/1476
Canonical URL declared
69%
1018/1476
Meta description present
70%
1031/1476
Character encoding declared
71%
1053/1476
Responsive viewport (zoom not disabled)
71%
1055/1476
Document language (lang) set
80%
1188/1476
Page has a <title>
100%
1476/1476
across 1476 page(s)
No Mastodon/Bluesky links detected on checked pages.
Progressive Web Resilience across 1476 page(s)
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
Result
Why it matters
Evidence
Service worker registered
✗ 0/1476 pages
A service worker is what makes offline access, caching, and background sync possible.
—
Manifest declares a maskable icon
✗ 0/1476 pages
A maskable icon lets the OS safely crop/mask the app icon on different device shapes without clipping content.