vital-scans open quality ledger

www.cdc.gov: week 2026-W33

This is the 2026-W33 ISO-week report (3332 pages fetched, 3030 unique pages audited by axe/Alfa). Generated 2026-08-14. Compared against 2026-W32 (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: 40 required finding type(s) (handling: review). Aspirational queue: 0 finding type(s). Advisory queue: 0 finding type(s). Unmapped review queue: 17 finding type(s).

New this week
0
Fixed this week
0
Regressed this week
8

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 3029 — 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 528 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 895 — 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)
Heading levels should only increase by one (WCAG criterion undetermined) (rule↗) Moderate 874 — Use heading levels in order (h1 → h2 → h3) without skipping; structure, not size. pages (CSV)
<html> element must have a lang attribute (WCAG 3.1.1) (rule↗) Serious 516 Without vision, Limited cognitive, language, or learning ability Add a lang attribute to <html> (e.g. lang="en"). pages (CSV)
Elements must meet minimum color contrast ratio thresholds (WCAG 1.4.3) (rule↗) Serious 537 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 752 — 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 749 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)

Progress

Open findings by severity over 10 weeks (lower is better)
Critical Serious Moderate Minor W24W28W33530

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
3030 of 3030
Median Alfa failures / page
88
Pages with Alfa failures
750 of 750
Unique pages audited
3030
Lighthouse performance (median)
77/100 297 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
96/100
Lighthouse agentic (median)
95/100
Words per page (median)
726 main content, nav excluded
Reading ease (median)
44 1314 prose pages
Reading grade (median)
12
Misspellings
25+ distinct details
Broken links
1273 details
Median page weight
5.0 MB +34 KB worse
Median requests per page
44
Estimated energy per page (mean)
1.5777 Wh

Note: page counts differ between weeks (3333 → 3332). Prefer the "pages affected" columns over raw instance counts when comparing.

Scan coverage this week (3332 pages · 3696 succeeded of 4035 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe303091%
resources303091%
plain-language148545%
standards146344%
alfa75023%
sustainability35311%
deprecated-html33810%
tech3029%
lighthouse2979%
security2798%

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

Changes since 2026-W32 17 change(s)

axe-core

  • Resolved: aria-required-children no longer fails on any scanned page.
  • Resolved: aria-hidden-focus no longer fails on any scanned page.
  • Resolved: presentation-role-conflict no longer fails on any scanned page.
  • color-contrast shrank: 606 → 537 pages affected (rate: 20% → 18% of pages scanned).
  • heading-order shrank: 984 → 874 pages affected (rate: 33% → 29% of pages scanned).
  • html-has-lang shrank: 578 → 516 pages affected (rate: 19% → 17% of pages scanned).
  • image-alt shrank: 587 → 528 pages affected (rate: 19% → 17% of pages scanned).
  • landmark-one-main shrank: 813 → 752 pages affected (rate: 27% → 25% of pages scanned).
  • landmark-unique spread: 808 → 895 pages affected (rate: 27% → 30% of pages scanned).

Alfa

  • New: sia-r1 appeared this week.
  • New: sia-r76 appeared this week.
  • Resolved: sia-r17 no longer fails on any scanned page.
  • Resolved: sia-r75 no longer fails on any scanned page.
  • sia-r53 shrank: 269 → 229 pages affected (rate: 35% → 31% of pages scanned).
  • sia-r74 shrank: 301 → 277 pages affected (rate: 39% → 37% of pages scanned).
  • sia-r113 shrank: 291 → 265 pages affected (rate: 38% → 35% of pages scanned).
  • sia-r69 spread: 213 → 233 pages affected (rate: 28% → 31% 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 (4466)

6144 distinct resources, by type.
TypeCount
PDF documents4855
Images630
Embedded media players207
Video files142
Spreadsheets71
Iframes66
Archives (zip, etc.)54
Word/text documents50
Presentations39
Audio files30