www.cdc.gov: Web standards & metadata — week 2026-W31
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%
0/1503
hreflang alternates declared
0%
0/1503
Open social presence (Mastodon/Bluesky) linked
0%
0/1503
Open Graph tags (6/6)
58%
866/1503
Twitter card metadata
58%
869/1503
Canonical URL declared
69%
1043/1503
Meta description present
70%
1048/1503
Character encoding declared
72%
1084/1503
Responsive viewport (zoom not disabled)
72%
1084/1503
Document language (lang) set
81%
1219/1503
Page has a <title>
100%
1503/1503
across 1503 page(s)
No Mastodon/Bluesky links detected on checked pages.
Progressive Web Resilience across 1503 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
✗ 0/1503 pages
A service worker is what makes offline access, caching, and background sync possible.
—
Manifest declares a maskable icon
✗ 0/1503 pages
A maskable icon lets the OS safely crop/mask the app icon on different device shapes without clipping content.