vital-scans open quality ledger

www.cdc.gov: week 2026-W36

This is the 2026-W36 ISO-week report (3331 pages fetched, 2959 unique pages audited by axe/Alfa). Generated 2026-09-05. Compared against 2026-W35 (1902 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: 37 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
12

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 2955 — 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 603 Without vision, Limited vision Give every <img> a meaningful alt attribute. Use alt="" only for decorative images so screen readers skip them. pages (CSV)
<html> element must have a lang attribute (WCAG 3.1.1) (rule↗) Serious 595 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 918 — 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 580 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)
Landmarks should have a unique role or role/label/title (i.e. accessible name) c (WCAG criterion undetermined) (rule↗) Moderate 856 — 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)
Document should have one main landmark (WCAG criterion undetermined) (rule↗) Moderate 811 — 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 729 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)

Progress

Open findings by severity over 13 weeks (lower is better)
Critical Serious Moderate Minor W24W30W36530

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 79 issue type(s)
Median axe violations / page
5
Pages with axe violations
2956 of 2959
Median Alfa failures / page
86
Pages with Alfa failures
731 of 731
Unique pages audited
2959
Lighthouse performance (median)
86/100 276 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
96/100
Lighthouse agentic (median)
97/100
Words per page (median)
759 main content, nav excluded
Reading ease (median)
46 1294 prose pages
Reading grade (median)
12
Misspellings
25+ distinct details
Broken links
1114 details
Median page weight
4.9 MB -159 KB better
Median requests per page
44
Estimated energy per page (mean)
1.7813 Wh

Note: page counts differ between weeks (1902 → 3331). Prefer the "pages affected" columns over raw instance counts when comparing.

Scan coverage this week (3331 pages · 3764 succeeded of 4179 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe295989%
resources295989%
plain-language150245%
standards147944%
alfa73122%
sustainability33210%
security3139%
deprecated-html3069%
tech2939%
lighthouse2768%

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

Changes since 2026-W35 13 change(s)

axe-core

  • New: landmark-no-duplicate-banner appeared this week.
  • New: object-alt appeared this week.
  • New: area-alt appeared this week.
  • Resolved: aria-tab-name no longer fails on any scanned page.
  • Resolved: aria-hidden-focus no longer fails on any scanned page.
  • heading-order spread: 562 → 918 pages affected (rate: 33% → 31% of pages scanned).

Alfa

  • New: sia-r76 appeared this week.
  • Resolved: sia-r90 no longer fails on any scanned page.
  • sia-r2 spread: 102 → 150 pages affected (rate: 23% → 21% of pages scanned).
  • sia-r4 spread: 98 → 145 pages affected (rate: 22% → 20% of pages scanned).
  • sia-r74 spread: 152 → 293 pages affected (rate: 34% → 40% of pages scanned).
  • sia-r11 spread: 53 → 62 pages affected (rate: 12% → 8% of pages scanned).
  • sia-r68 spread: 59 → 81 pages affected (rate: 13% → 11% 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 (3414)

5191 distinct resources, by type.
TypeCount
PDF documents3787
Images540
Archives (zip, etc.)293
Embedded media players159
Spreadsheets131
Video files99
Iframes70
Word/text documents51
Presentations30
Audio files29
SVG2