vital-scans open quality ledger

www.cdc.gov: week 2026-W29

This is the 2026-W29 ISO-week report (3333 pages fetched, 3065 unique pages audited by axe/Alfa). Generated 2026-07-24. Compared against 2026-W28 (1967 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: 44 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
9

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 3062 — Wrap all page content in landmarks (header, nav, main, footer) so users can navigate by region. pages (CSV)
Target size is at least 44×44 CSS pixels (Enhanced) (WCAG 2.5.5) (rule↗) Moderate 1495 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)
Images must have alternative text (WCAG 1.1.1) (rule↗) Critical 622 Without vision, Limited vision Give every <img> a meaningful alt attribute. Use alt="" only for decorative images so screen readers skip them. pages (CSV)
Text has enhanced contrast (WCAG 1.4.6) (rule↗) Moderate 1263 — Increase text contrast to meet WCAG AAA (7:1). pages (CSV)
Scrolling content can be accessed by keyboard (WCAG criterion undetermined) (rule↗) Moderate 1092 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r57 pages (CSV)
Elements must meet minimum color contrast ratio thresholds (WCAG 1.4.3) (rule↗) Serious 720 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)
Heading levels should only increase by one (WCAG criterion undetermined) (rule↗) Moderate 1035 — 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 595 Without vision, Limited cognitive, language, or learning ability Add a lang attribute to <html> (e.g. lang="en"). pages (CSV)

Progress

Open findings by severity over 6 weeks (lower is better)
Critical Serious Moderate Minor W24W26W29530

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 86 issue type(s)
Median axe violations / page
5
Pages with axe violations
3064 of 3065
Median Alfa failures / page
82
Pages with Alfa failures
1495 of 1495
Unique pages audited
3065
Lighthouse performance (median)
82/100 313 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
96/100
Lighthouse agentic (median)
96/100
Words per page (median)
745 main content, nav excluded
Reading ease (median)
45 1360 prose pages
Reading grade (median)
13
Misspellings
25+ distinct details
Broken links
720 details
Median page weight
5.1 MB +19 KB worse
Median requests per page
44
Estimated energy per page (mean)
1.7689 Wh

Note: page counts differ between weeks (1967 → 3333). Prefer the "pages affected" columns over raw instance counts when comparing.

Scan coverage this week (3333 pages · 3744 succeeded of 4060 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe306592%
resources306592%
plain-language155747%
standards150345%
alfa149545%
sustainability32510%
deprecated-html32410%
lighthouse3139%
tech3129%
security2999%

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

Changes since 2026-W28 15 change(s)

axe-core

  • New: document-title appeared this week.
  • New: landmark-contentinfo-is-top-level appeared this week.
  • New: landmark-no-duplicate-banner appeared this week.
  • New: landmark-no-duplicate-contentinfo appeared this week.
  • New: tabindex appeared this week.
  • Resolved: area-alt no longer fails on any scanned page.
  • Resolved: valid-lang no longer fails on any scanned page.
  • image-alt spread: 400 → 622 pages affected (rate: 22% → 20% of pages scanned).

Alfa

  • New: sia-r1 appeared this week.
  • Resolved: sia-r87 no longer fails on any scanned page.
  • sia-r66 spread: 738 → 1263 pages affected (rate: 82% → 84% of pages scanned).
  • sia-r53 spread: 315 → 490 pages affected (rate: 35% → 33% of pages scanned).
  • sia-r18 spread: 448 → 777 pages affected (rate: 50% → 52% of pages scanned).
  • sia-r14 spread: 86 → 191 pages affected (rate: 10% → 13% of pages scanned).
  • sia-r2 spread: 201 → 297 pages affected (rate: 22% → 20% 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 (4560)

5449 distinct resources, by type.
TypeCount
PDF documents4322
Images557
Embedded media players149
Spreadsheets106
Video files97
Iframes83
Word/text documents61
Archives (zip, etc.)37
Audio files17
Presentations15
Embeds / objects5