vital-scans open quality ledger

www.cdc.gov: week 2026-W39

This is the 2026-W39 ISO-week report (3333 pages fetched, 2930 unique pages audited by axe/Alfa). Generated 2026-09-30. Compared against 2026-W38 (1858 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: 38 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
6

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 2928 — Wrap all page content in landmarks (header, nav, main, footer) so users can navigate by region. pages (CSV)
Images must have alternative text (WCAG 1.1.1) (rule↗) Critical 588 Without vision, Limited vision Give every <img> a meaningful alt attribute. Use alt="" only for decorative images so screen readers skip them. pages (CSV)
Landmarks should have a unique role or role/label/title (i.e. accessible name) c (WCAG criterion undetermined) (rule↗) Moderate 977 — When a landmark role/type repeats (e.g. two <nav>s), give each a distinct accessible name with aria-label or aria-labelledby (e.g. "Primary" and "Footer" navigation) so screen-reader users can tell them apart. pages (CSV)
<html> element must have a lang attribute (WCAG 3.1.1) (rule↗) Serious 589 Without vision, Limited cognitive, language, or learning ability Add a lang attribute to <html> (e.g. lang="en"). pages (CSV)
Heading levels should only increase by one (WCAG criterion undetermined) (rule↗) Moderate 880 — 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 570 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)
Document should have one main landmark (WCAG criterion undetermined) (rule↗) Moderate 799 — Each page should have exactly one <main> landmark. pages (CSV)
Target size is at least 44×44 CSS pixels (Enhanced) (WCAG 2.5.5) (rule↗) Moderate 728 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)

Progress

Open findings by severity over 16 weeks (lower is better)
Critical Serious Moderate Minor W24W31W39530

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 80 issue type(s)
Median axe violations / page
5
Pages with axe violations
2928 of 2930 CSV
Median Alfa failures / page
81
Pages with Alfa failures
732 of 732 CSV
Unique pages audited
2930
Lighthouse performance (median)
80/100 294 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
100/100
Lighthouse agentic (median)
93/100
Words per page (median)
716 main content, nav excluded
Reading ease (median)
46 1236 prose pages details
Reading grade (median)
12
Misspellings
25+ distinct details
Broken links
788 details
Median page weight
5.0 MB -56 KB better
Median requests per page
45
Estimated energy per page (mean)
1.4364 Wh

Note: page counts differ between weeks (1858 → 3333). Prefer the "pages affected" columns over raw instance counts when comparing.

Scan coverage this week (3333 pages · 4269 succeeded of 4767 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe293088%
resources293088%
plain-language149845%
standards146144%
alfa73222%
sustainability32710%
tech2999%
deprecated-html2969%
lighthouse2949%
security2929%

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

Changes since 2026-W38 25 change(s)

axe-core

  • New: aria-prohibited-attr appeared this week.
  • New: aria-valid-attr-value appeared this week.
  • New: table-duplicate-name appeared this week.
  • landmark-unique spread: 518 → 977 pages affected (rate: 31% → 33% of pages scanned).
  • landmark-contentinfo-is-top-level spread: 1 → 158 pages affected (rate: 0% → 5% of pages scanned).
  • landmark-no-duplicate-banner spread: 1 → 158 pages affected (rate: 0% → 5% of pages scanned).
  • landmark-no-duplicate-contentinfo spread: 1 → 158 pages affected (rate: 0% → 5% of pages scanned).
  • page-has-heading-one spread: 55 → 251 pages affected (rate: 3% → 9% of pages scanned).
  • skip-link spread: 10 → 172 pages affected (rate: 1% → 6% of pages scanned).
  • tabindex spread: 1 → 158 pages affected (rate: 0% → 5% of pages scanned).

Alfa

  • New: sia-r85 appeared this week.
  • New: sia-r59 appeared this week.
  • Resolved: sia-r86 no longer fails on any scanned page.
  • sia-r2 spread: 86 → 161 pages affected (rate: 20% → 22% of pages scanned).
  • sia-r53 spread: 123 → 242 pages affected (rate: 28% → 33% of pages scanned).
  • sia-r74 spread: 177 → 324 pages affected (rate: 41% → 44% of pages scanned).
  • sia-r113 spread: 145 → 265 pages affected (rate: 34% → 36% of pages scanned).
  • sia-r70 spread: 100 → 190 pages affected (rate: 23% → 26% of pages scanned).
  • sia-r11 spread: 30 → 69 pages affected (rate: 7% → 9% of pages scanned).
  • sia-r18 spread: 231 → 365 pages affected (rate: 53% → 50% of pages scanned).
  • sia-r57 spread: 324 → 528 pages affected (rate: 75% → 72% of pages scanned).
  • sia-r68 spread: 52 → 65 pages affected (rate: 12% → 9% of pages scanned).
  • sia-r61 spread: 37 → 99 pages affected (rate: 9% → 14% of pages scanned).
  • sia-r80 spread: 2 → 41 pages affected (rate: 0% → 6% of pages scanned).
  • sia-r14 spread: 66 → 72 pages affected (rate: 15% → 10% 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 (3111)

5150 distinct resources, by type.
TypeCount
PDF documents4015
Images567
Embedded media players143
Spreadsheets108
Archives (zip, etc.)97
Iframes84
Video files66
Word/text documents35
Audio files20
Presentations15