vital-scans open quality ledger

www.cdc.gov: week 2026-W30

This is the 2026-W30 ISO-week report (3095 pages fetched, 2836 unique pages audited by axe/Alfa). Generated 2026-07-26. Compared against 2026-W29 (3333 fetched). The dashboard headline uses a rolling last-7-days window; this page is the full ISO week. Machine-readable API: snapshot.json · findings.json.

Primary standards queue: 0 required finding type(s) (handling: report). Verification queue: 41 required finding type(s) (handling: review). Aspirational queue: 0 finding type(s). Advisory queue: 0 finding type(s). Unmapped review queue: 18 finding type(s).

New this week
0
Fixed this week
0
Regressed this week
2

Fix these first

Highest-leverage issues, ranked by pages affected × severity × people reached. Fixing a shared component often clears many pages at once. Issue links go to the full bug detail on the Accessibility page.

Top 8 issues to prioritize this week.
IssueSeverityPagesWho it affectsHow to fixEvidence
All page content should be contained by landmarks (WCAG criterion undetermined) (rule↗) Serious 2833 — Wrap all page content in landmarks (header, nav, main, footer) so users can navigate by region. pages (CSV)
Target size is at least 44×44 CSS pixels (Enhanced) (WCAG 2.5.5) (rule↗) Moderate 1431 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)
Images must have alternative text (WCAG 1.1.1) (rule↗) Critical 591 Without vision, Limited vision Give every <img> a meaningful alt attribute. Use alt="" only for decorative images so screen readers skip them. pages (CSV)
Text has enhanced contrast (WCAG 1.4.6) (rule↗) Moderate 1223 — Increase text contrast to meet WCAG AAA (7:1). pages (CSV)
Scrolling content can be accessed by keyboard (WCAG criterion undetermined) (rule↗) Moderate 1021 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r57 pages (CSV)
Heading levels should only increase by one (WCAG criterion undetermined) (rule↗) Moderate 989 — Use heading levels in order (h1 → h2 → h3) without skipping; structure, not size. pages (CSV)
Elements must meet minimum color contrast ratio thresholds (WCAG 1.4.3) (rule↗) Serious 648 Limited vision, Without color perception Increase the contrast between text and its background to at least 4.5:1 (3:1 for large text). Check both light and dark modes. pages (CSV)
<html> element must have a lang attribute (WCAG 3.1.1) (rule↗) Serious 563 Without vision, Limited cognitive, language, or learning ability Add a lang attribute to <html> (e.g. lang="en"). pages (CSV)

Progress

Open findings by severity over 7 weeks (lower is better)
Critical Serious Moderate Minor W24W27W30530

Dropped from this week's sample

These stopped appearing in scan results, but their pages were not re-checked this week — this is not a confirmed fix.

This week at a glance 82 issue type(s)
Median axe violations / page
5
Pages with axe violations
2835 of 2836
Median Alfa failures / page
83
Pages with Alfa failures
1431 of 1431
Unique pages audited
2836
Lighthouse performance (median)
84/100 286 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
96/100
Lighthouse agentic (median)
95/100
Words per page (median)
716 main content, nav excluded
Reading ease (median)
43.9 1235 prose pages
Reading grade (median)
12.6
Misspellings
25+ distinct details
Broken links
753 details
Median page weight
5.0 MB -147 KB better
Median requests per page
44
Estimated energy per page (mean)
1.5171 Wh

Note: page counts differ between weeks (3333 → 3095). Prefer the "pages affected" columns over raw instance counts when comparing.

Scan coverage this week (3095 pages · 3100 succeeded of 3363 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe283692%
resources283692%
standards147648%
alfa143146%
plain-language141246%
sustainability31710%
deprecated-html31510%
security2899%
lighthouse2869%
tech2719%

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

Changes since 2026-W29 17 change(s)

axe-core

  • New: landmark-banner-is-top-level appeared this week.
  • New: landmark-main-is-top-level appeared this week.
  • New: landmark-no-duplicate-main appeared this week.
  • Resolved: document-title no longer fails on any scanned page.
  • Resolved: landmark-contentinfo-is-top-level no longer fails on any scanned page.
  • Resolved: landmark-no-duplicate-contentinfo no longer fails on any scanned page.
  • Resolved: tabindex no longer fails on any scanned page.
  • Resolved: aria-valid-attr-value no longer fails on any scanned page.
  • Resolved: table-duplicate-name no longer fails on any scanned page.
  • link-name spread: 196 → 239 pages affected (rate: 6% → 8% of pages scanned).

Alfa

  • New: sia-r87 appeared this week.
  • Resolved: sia-r1 no longer fails on any scanned page.
  • Resolved: sia-r59 no longer fails on any scanned page.
  • sia-r113 spread: 534 → 568 pages affected (rate: 36% → 40% of pages scanned).
  • sia-r18 shrank: 777 → 691 pages affected (rate: 52% → 48% of pages scanned).
  • sia-r53 spread: 490 → 507 pages affected (rate: 33% → 35% of pages scanned).
  • sia-r11 spread: 87 → 126 pages affected (rate: 6% → 9% of pages scanned).

Embedded & linked resources

Non-HTML resources this site links to or embeds — PDFs, Office documents, iframes, and media. The site owner is responsible for their accessibility too. Full inventory with first-seen dates: CSV.

New this week (5359)

6413 distinct resources, by type.
TypeCount
PDF documents4738
Images522
Archives (zip, etc.)469
Embedded media players246
Video files182
Iframes91
Spreadsheets86
Word/text documents45
Audio files17
Presentations16
SVG1