vital-scans open quality ledger

www.cdc.gov: week 2026-W26

This is the 2026-W26 ISO-week report (1667 pages fetched, 1546 unique pages audited by axe/Alfa). Generated 2026-07-13. Compared against 2026-W25 (1667 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: 36 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
1

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 1544 — 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 759 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)
Text has enhanced contrast (WCAG 1.4.6) (rule↗) Moderate 665 — Increase text contrast to meet WCAG AAA (7:1). pages (CSV)
Scrolling content can be accessed by keyboard (WCAG criterion undetermined) (rule↗) Moderate 588 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r57 pages (CSV)
Images must have alternative text (WCAG 1.1.1) (rule↗) Critical 260 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 549 — Use heading levels in order (h1 → h2 → h3) without skipping; structure, not size. pages (CSV)
Landmarks should have a unique role or role/label/title (i.e. accessible name) c (WCAG criterion undetermined) (rule↗) Moderate 467 — 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)
Elements must meet minimum color contrast ratio thresholds (WCAG 1.4.3) (rule↗) Serious 286 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)

Progress

Open findings by severity over 3 weeks (lower is better)
Critical Serious Moderate Minor W24W25W26470

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 74 issue type(s)
Median axe violations / page
5
Pages with axe violations
1545 of 1546
Median Alfa failures / page
84
Pages with Alfa failures
760 of 760
Unique pages audited
1546
Lighthouse performance (median)
78/100 143 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
96/100
Lighthouse agentic (median)
94/100
Words per page (median)
766 main content, nav excluded
Reading ease (median)
42 652 prose pages
Reading grade (median)
13
Misspellings
25+ distinct details
Broken links
390 details
Median page weight
5.2 MB -91 KB better
Median requests per page
45
Estimated energy per page (mean)
1.7955 Wh
Scan coverage this week (1667 pages · 2826 succeeded of 3011 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe154693%
resources154693%
standards76646%
alfa76046%
plain-language74945%
sustainability17611%
security1499%
lighthouse1439%
deprecated-html1418%
tech1298%

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

Changes since 2026-W25 20 change(s)

axe-core

  • New: definition-list appeared this week.
  • New: valid-lang appeared this week.
  • New: button-name appeared this week.
  • Resolved: document-title no longer fails on any scanned page.
  • Resolved: aria-input-field-name no longer fails on any scanned page.
  • Resolved: aria-roles no longer fails on any scanned page.
  • landmark-unique shrank: 528 → 467 pages affected (rate: 34% → 30% of pages scanned).

Alfa

  • New: sia-r72 appeared this week.
  • Resolved: sia-r1 no longer fails on any scanned page.
  • Resolved: sia-r71 no longer fails on any scanned page.
  • sia-r66 spread: 538 → 665 pages affected (rate: 85% → 88% of pages scanned).
  • sia-r113 spread: 243 → 270 pages affected (rate: 38% → 36% of pages scanned).
  • sia-r57 spread: 467 → 588 pages affected (rate: 74% → 77% of pages scanned).
  • sia-r69 spread: 225 → 254 pages affected (rate: 36% → 33% of pages scanned).
  • sia-r73 spread: 208 → 233 pages affected (rate: 33% → 31% of pages scanned).
  • sia-r2 shrank: 136 → 136 pages affected (rate: 22% → 18% of pages scanned).
  • sia-r4 shrank: 134 → 127 pages affected (rate: 21% → 17% of pages scanned).
  • sia-r70 shrank: 163 → 157 pages affected (rate: 26% → 21% of pages scanned).
  • sia-r14 spread: 67 → 96 pages affected (rate: 11% → 13% of pages scanned).
  • sia-r78 spread: 29 → 77 pages affected (rate: 5% → 10% 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 (4026)

4424 distinct resources, by type.
TypeCount
PDF documents3921
Images201
Embedded media players89
Iframes62
Spreadsheets50
Video files48
Word/text documents28
Presentations10
Audio files9
Archives (zip, etc.)6