vital-scans open quality ledger

www.cdc.gov: week 2026-W27

This is the 2026-W27 ISO-week report (1667 pages fetched, 1582 unique pages audited by axe/Alfa). Generated 2026-07-18. Compared against 2026-W26 (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: 34 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
3

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 1580 — 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 781 — See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 pages (CSV)
Images must have alternative text (WCAG 1.1.1) (rule↗) Critical 352 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 634 — Increase text contrast to meet WCAG AAA (7:1). pages (CSV)
Scrolling content can be accessed by keyboard (WCAG criterion undetermined) (rule↗) Moderate 556 — 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 372 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 536 — 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 333 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 4 weeks (lower is better)
Critical Serious Moderate Minor W24W25W27500

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 73 issue type(s)
Median axe violations / page
5
Pages with axe violations
1581 of 1582
Median Alfa failures / page
83
Pages with Alfa failures
781 of 781
Unique pages audited
1582
Lighthouse performance (median)
80/100 158 sampled details
Lighthouse SEO (median)
100/100
Lighthouse best practices (median)
100/100
Lighthouse agentic (median)
96/100
Words per page (median)
763 main content, nav excluded
Reading ease (median)
43 688 prose pages
Reading grade (median)
13
Misspellings
25+ distinct details
Broken links
416 details
Median page weight
5.2 MB +70 KB worse
Median requests per page
46
Estimated energy per page (mean)
1.8482 Wh
Scan coverage this week (1667 pages · 2337 succeeded of 2451 attempted)
Pages each engine ran on, per the configured weekly sampling rates.
EnginePagesCoverage
axe158295%
resources158295%
alfa78147%
plain-language77747%
standards75645%
sustainability17310%
tech16910%
deprecated-html16410%
lighthouse1589%
security1308%

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

Changes since 2026-W26 19 change(s)

axe-core

  • Resolved: aria-allowed-attr no longer fails on any scanned page.
  • Resolved: table-duplicate-name no longer fails on any scanned page.
  • Resolved: definition-list no longer fails on any scanned page.
  • Resolved: valid-lang no longer fails on any scanned page.
  • Resolved: button-name no longer fails on any scanned page.
  • color-contrast spread: 286 → 372 pages affected (rate: 18% → 24% of pages scanned).
  • landmark-one-main spread: 343 → 426 pages affected (rate: 22% → 27% of pages scanned).
  • html-has-lang spread: 247 → 333 pages affected (rate: 16% → 21% of pages scanned).
  • image-alt spread: 260 → 352 pages affected (rate: 17% → 22% of pages scanned).

Alfa

  • sia-r66 shrank: 665 → 634 pages affected (rate: 88% → 81% of pages scanned).
  • sia-r74 spread: 241 → 292 pages affected (rate: 32% → 37% of pages scanned).
  • sia-r57 shrank: 588 → 556 pages affected (rate: 77% → 71% of pages scanned).
  • sia-r68 shrank: 111 → 80 pages affected (rate: 15% → 10% of pages scanned).
  • sia-r14 shrank: 96 → 78 pages affected (rate: 13% → 10% of pages scanned).
  • sia-r73 spread: 233 → 297 pages affected (rate: 31% → 38% of pages scanned).
  • sia-r61 spread: 68 → 90 pages affected (rate: 9% → 12% of pages scanned).
  • sia-r2 spread: 136 → 190 pages affected (rate: 18% → 24% of pages scanned).
  • sia-r4 spread: 127 → 177 pages affected (rate: 17% → 23% of pages scanned).
  • sia-r70 spread: 157 → 215 pages affected (rate: 21% → 28% 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 (2944)

3432 distinct resources, by type.
TypeCount
PDF documents2824
Images212
Embedded media players116
Video files73
Spreadsheets62
Word/text documents40
Presentations37
Iframes34
Archives (zip, etc.)23
Audio files11