vital-scans open quality ledger

www.cdc.gov: week 2026-W40

This is the 2026-W40 ISO-week report (1948 pages fetched, 1693 unique pages audited by axe/Alfa). Generated 2026-09-30. Compared against 2026-W39 (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: 34 required finding type(s) (handling: review). Aspirational queue: 0 finding type(s). Advisory queue: 0 finding type(s). Unmapped review queue: 19 finding type(s).

New this week
0
Fixed this week
0
Regressed this week
6

Over the whole history of this site, 40472 unique pages have been scanned at least once; 39122 have known accessibility issues. 1693 of them were re-checked this ISO week. Download full data (JSON).

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 1692 — 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 339 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 584 — 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 340 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 512 — 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 309 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 440 — 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 416 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)

Progress

Open findings by severity over 17 weeks (lower is better)
Critical Serious Moderate Minor W24W32W40530

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 78 issue type(s)
Median axe violations / page
5
Pages with axe violations
1693 of 1693 CSV
Median Alfa failures / page
79
Pages with Alfa failures
418 of 418 CSV
Unique pages audited
1693
Lighthouse performance (median)
82/100 165 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
100/100
Lighthouse agentic (median)
94/100
Words per page (median)
707 main content, nav excluded
Reading ease (median)
44.2 699 prose pages details
Reading grade (median)
12.5
Misspellings
25+ distinct details
Broken links
411 details
Median page weight
5.1 MB +83 KB worse
Median requests per page
47
Estimated energy per page (mean)
1.5763 Wh

Note: page counts differ between weeks (3333 → 1948). Prefer the "pages affected" columns over raw instance counts when comparing.

Scan coverage this week (1948 pages · 2345 succeeded of 2659 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe169387%
resources169387%
standards86544%
plain-language84944%
alfa41821%
sustainability19310%
security1799%
tech1769%
lighthouse1669%
deprecated-html1628%

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

Changes since 2026-W39 16 change(s)

axe-core

  • New: landmark-main-is-top-level appeared this week.
  • New: landmark-no-duplicate-main appeared this week.
  • New: document-title appeared this week.
  • New: presentation-role-conflict appeared this week.
  • Resolved: aria-dialog-name no longer fails on any scanned page.
  • Resolved: aria-valid-attr-value no longer fails on any scanned page.
  • Resolved: valid-lang no longer fails on any scanned page.
  • Resolved: image-redundant-alt no longer fails on any scanned page.

Alfa

  • New: sia-r86 appeared this week.
  • New: sia-r72 appeared this week.
  • Resolved: sia-r76 no longer fails on any scanned page.
  • Resolved: sia-r7 no longer fails on any scanned page.
  • Resolved: sia-r84 no longer fails on any scanned page.
  • Resolved: sia-r75 no longer fails on any scanned page.
  • sia-r18 shrank: 365 → 222 pages affected (rate: 50% → 53% of pages scanned).
  • sia-r69 shrank: 244 → 154 pages affected (rate: 33% → 37% 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 (1902)

3089 distinct resources, by type.
TypeCount
PDF documents2391
Images333
Embedded media players120
Spreadsheets77
Video files56
Iframes34
Word/text documents23
Presentations23
Audio files17
Archives (zip, etc.)15