vital-scans open quality ledger

www.cdc.gov: week 2026-W31

This is the 2026-W31 ISO-week report (3333 pages fetched, 3083 unique pages audited by axe/Alfa). Generated 2026-07-30. Compared against 2026-W30 (3095 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: 20 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 3082 — 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 627 Without vision, Limited vision Give every <img> a meaningful alt attribute. Use alt="" only for decorative images so screen readers skip them. pages (CSV)
Heading levels should only increase by one (WCAG criterion undetermined) (rule↗) Moderate 1046 — 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 658 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 600 Without vision, Limited cognitive, language, or learning ability Add a lang attribute to <html> (e.g. lang="en"). pages (CSV)
Document should have one main landmark (WCAG criterion undetermined) (rule↗) Moderate 864 — Each page should have exactly one <main> landmark. pages (CSV)
Landmarks should have a unique role or role/label/title (i.e. accessible name) c (WCAG criterion undetermined) (rule↗) Moderate 855 — 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)
Target size is at least 44×44 CSS pixels (Enhanced) (WCAG 2.5.5) (rule↗) Moderate 775 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)

Progress

Open findings by severity over 8 weeks (lower is better)
Critical Serious Moderate Minor W24W27W31530

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
3082 of 3083
Median Alfa failures / page
87
Pages with Alfa failures
776 of 776
Unique pages audited
3083
Lighthouse performance (median)
82/100 341 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
96/100
Lighthouse agentic (median)
96/100
Words per page (median)
730 main content, nav excluded
Reading ease (median)
44 1397 prose pages
Reading grade (median)
12.5
Misspellings
25+ distinct details
Broken links
856 details
Median page weight
5.1 MB +77 KB worse
Median requests per page
44
Estimated energy per page (mean)
1.5047 Wh

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

Scan coverage this week (3333 pages · 3494 succeeded of 3748 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe308392%
resources308392%
plain-language160948%
standards150345%
alfa77623%
lighthouse34110%
sustainability32610%
security2959%
deprecated-html2859%
tech2748%

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

Changes since 2026-W30 16 change(s)

axe-core

  • New: landmark-contentinfo-is-top-level appeared this week.
  • New: landmark-no-duplicate-contentinfo appeared this week.
  • New: tabindex appeared this week.
  • New: table-duplicate-name appeared this week.
  • New: valid-lang appeared this week.
  • Resolved: landmark-banner-is-top-level no longer fails on any scanned page.
  • Resolved: aria-hidden-focus no longer fails on any scanned page.
  • Resolved: landmark-main-is-top-level no longer fails on any scanned page.
  • Resolved: landmark-no-duplicate-main no longer fails on any scanned page.

Alfa

  • New: sia-r59 appeared this week.
  • New: sia-r86 appeared this week.
  • Resolved: sia-r76 no longer fails on any scanned page.
  • Resolved: sia-r17 no longer fails on any scanned page.
  • Resolved: sia-r42 no longer fails on any scanned page.
  • Resolved: sia-r45 no longer fails on any scanned page.
  • sia-r61 shrank: 176 → 118 pages affected (rate: 12% → 15% 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 (4440)

6129 distinct resources, by type.
TypeCount
PDF documents4902
Images659
Embedded media players186
Video files109
Iframes93
Spreadsheets52
Word/text documents39
Presentations33
Archives (zip, etc.)30
Audio files26