vital-scans open quality ledger

www.cdc.gov: Accessibility — week 2026-W26

Automated Accessibility Conformance Report (OpenACR): Download ACR. Machine-readable; compatible with GSA OpenACR tooling. Automated tools find ~⅓ of real barriers — supplement with manual AT testing.

Training priorities

Top WCAG success criteria by pages affected this week. Use these to focus team training on the highest-impact issues.

SCCriterionPagesRulesNotes
2.5.5 WCAG 2.5.5 759 1
1.4.6 WCAG 1.4.6 665 1
1.4.3 Contrast (Minimum) 540 2
1.4.8 WCAG 1.4.8 479 3 Component inconsistency
1.1.1 Non-text Content (images, icons) 396 2

Next 10 actions

Clusters are fingerprinted by normalized selector path + rule id + snippet shape. Rank score = (severity weight × pages affected) / distinct components for the rule. This supersedes the template threshold heuristic while still surfacing it as a validation signal.

Top 10 clustered component fixes for this week.
ClusterSeverityPagesWho it affectsHow to fixEvidenceDecision
<html> element must have a lang attribute · unattributed component
Fix one place, resolve ~247 finding(s) on 247 page(s).
XPath / selector: html
<html>
 Serious 247 Without vision, Limited cognitive, language, or learning ability Add a lang attribute to <html> (e.g. lang="en"). pages (CSV)
Document has a valid lang attribute · unattributed component
Fix one place, resolve ~127 finding(s) on 127 page(s).
XPath / selector: <html>
 Moderate 127 Without vision, Limited cognitive, language, or learning ability Add a valid lang attribute to <html>. pages (CSV)
Form elements should have a visible label · unattributed component
Fix one place, resolve ~65 finding(s) on 65 page(s).
XPath / selector: .smallfield
<input class="smallfield" type="text" name="email" size="15" title="Insert e-mail" value="Insert e-mail" onfocus="this.value=''">
 Serious 65 Requires manual testing. See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/label-title-only?application=axeAPI pages (CSV)
Document should have one main landmark · unattributed component
Fix one place, resolve ~281 finding(s) on 281 page(s).
XPath / selector: html
<html>
 Moderate 281 Requires manual testing. Each page should have exactly one <main> landmark. pages (CSV)
Landmarks should have a unique role or role/label/title (i.e. accessible name) c · unattributed component
Fix one place, resolve ~464 finding(s) on 464 page(s).
XPath / selector: .page-right-rail__static
<aside class="page-right-rail__static noindex" role="complementary" style="margin-top: 47px;">
 Moderate 464 Requires manual testing. 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)
Page should contain a level-one heading · unattributed component
Fix one place, resolve ~73 finding(s) on 73 page(s).
XPath / selector: html
<html lang="en-us" class="cdc-theme-cdc cdc-page-type--content">
 Moderate 73 Requires manual testing. See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/page-has-heading-one?application=axeAPI pages (CSV)
aria attribute is permitted for element role · unattributed component
Fix one place, resolve ~336 finding(s) on 336 page(s).
XPath / selector: @aria-label="Official website of the United States government"
 Moderate 336 Requires manual testing. Only use ARIA states/properties that are allowed on this element/role. pages (CSV)
No obsolete or deprecated elements are used · unattributed component
Fix one place, resolve ~90 finding(s) on 90 page(s).
XPath / selector: {"type":"document","children":[{"type":"element","children":[{"type":"element","
 Moderate 90 Requires manual testing. See remediation guidance: https://alfa.siteimprove.com/rules/sia-r70 pages (CSV)
Scrolling content can be accessed by keyboard · unattributed component
Fix one place, resolve ~479 finding(s) on 479 page(s).
XPath / selector: text: "Skip directly to search"
 Moderate 479 Requires manual testing. See remediation guidance: https://alfa.siteimprove.com/rules/sia-r57 pages (CSV)
Form elements must have labels · unattributed component
Fix one place, resolve ~59 finding(s) on 59 page(s).
XPath / selector: #searchBox
<input id="searchBox" class="searchBox" name="query" maxlength="256" type="text" style="width: 230px;">
 Critical 59 Without vision, Limited vision, Limited manipulation/strength Associate every form control with a <label> (via for/id) or an aria-label/aria-labelledby. pages (CSV)

Bug reports

31 issue type(s) are shown by default out of 74 total. Prioritized by severity, key pages, WCAG level, and prevalence; use the toggle to show everything.

Overall severity mix: 6 critical, 16 serious, 47 moderate, 5 minor. By WCAG category: 31 WCAG 2.0 A, 3 WCAG 2.0 AA, 1 WCAG 2.1 A, 1 WCAG 2.2 AA, 5 WCAG 2.x AAA, 13 Best Practice, 20 Undetermined. Ordered by severity, key-page impact, WCAG level, and prevalence. Following accessibility bug-reporting best practices. Download: Markdown · JSON (full archive) · JSON (AI diagnostic) · CSV (all findings) · Priority pages CSV · Priority pages JSON.

Automated testing does not establish full WCAG conformance. Findings in the verification lane require manual testing before they are treated as confirmed failures.

The 50 highest-priority findings are shown in full; 24 more lower-priority finding(s) are summarised at the end of the page, and every finding is in the CSV/JSON downloads.

6 finding(s) marked "possible duplicate" — Alfa and axe-core both flagged the same WCAG SC on overlapping pages. If they target the same element, the axe-core report is authoritative. Filter the CSV by possible_duplicate_of to see these. Two engines flagging the same barrier reduces the chance of a false positive.

Findings needing review

These findings need manual verification before they can be treated as confirmed failures. Obligation remains visible for each finding.

Serious axe color-contrast WCAG 2.0 AA Elements must meet minimum color contrast ratio thresholds (WCAG 1.4.3) 286/1667 pages · 393 instances Likely template
Bug ID
VS-2d4f050c
Pattern ID
VS-be8d563e
Combined ID
VS-2d4f050c (pattern VS-be8d563e) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 AA
Obligation
required
Handling
review
WCAG SC
1.4.3 Contrast (Minimum) (Level AA, WCAG 2.0)
XPath / selector
i > span > b
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<b>Please note:</b>

Description

Elements must meet minimum color contrast ratio thresholds. Detected by axe-core rule color-contrast on 286 of 1667 scanned pages (393 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/volumes/71/wr/mm7117e1.htm?s_cid=mm7117e1_w.
  2. Locate the element: i > span > b
  3. Confirm the axe-core finding for rule color-contrast against WCAG 1.4.3 Contrast (Minimum).

Impact

Affects Limited vision (2.4%), Without color perception (4.5%).

  • Limited vision — 2.4% of population
  • Without color perception — 4.5% of population

Affected pages

…and more — all 286 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: 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.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/color-contrast?application=axeAPI

Critical axe image-alt WCAG 2.0 A Images must have alternative text (WCAG 1.1.1) 260/1667 pages · 2789 instances Likely template
Bug ID
VS-77adcdbc
Pattern ID
VS-9074b4dd
Combined ID
VS-77adcdbc (pattern VS-9074b4dd) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.1.1 Non-text Content (Level A, WCAG 2.0)
XPath / selector
img[height="8"][alt=" "][width="140"]
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<img src="http://www.cdc.gov/navimages/nav21.gif" border="0" alt=" " width="140" height="8">

Description

Images must have alternative text. Detected by axe-core rule image-alt on 260 of 1667 scanned pages (2789 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: img[height="8"][alt=" "][width="140"]
  3. Confirm the axe-core finding for rule image-alt against WCAG 1.1.1 Non-text Content.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

…and more — all 260 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give every <img> a meaningful alt attribute. Use alt="" only for decorative images so screen readers skip them.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/image-alt?application=axeAPI

Serious axe html-has-lang WCAG 2.0 A <html> element must have a lang attribute (WCAG 3.1.1) 247/1667 pages · 247 instances Likely template
Bug ID
VS-8f881ad8
Pattern ID
VS-c126b6a6
Combined ID
VS-8f881ad8 (pattern VS-c126b6a6) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
3.1.1 Language of Page (Level A, WCAG 2.0)
XPath / selector
html
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<html>

Description

<html> element must have a lang attribute. Detected by axe-core rule html-has-lang on 247 of 1667 scanned pages (247 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: html
  3. Confirm the axe-core finding for rule html-has-lang against WCAG 3.1.1 Language of Page.

Impact

Affects Without vision (1.0%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

…and more — all 247 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Add a lang attribute to <html> (e.g. lang="en").

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/html-has-lang?application=axeAPI

Serious axe link-name WCAG 2.0 A Links must have discernible text (WCAG 2.4.4) 112/1667 pages · 221 instances Likely template
Bug ID
VS-b9794205
Pattern ID
VS-e9fe47ac
Combined ID
VS-b9794205 (pattern VS-e9fe47ac) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
2.4.4 Link Purpose (In Context) (Level A, WCAG 2.0)
XPath / selector
table[cellpadding="0"]:nth-child(2) > tbody > tr > td[width="140"] > a[href$="cdc.gov/"]
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<a href="http://www.cdc.gov/"><img src="http://www.cdc.gov/navimages/nav21.gif" border="0" alt=" " width="140" height="8"></a>

Description

Links must have discernible text. Detected by axe-core rule link-name on 112 of 1667 scanned pages (221 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: table[cellpadding="0"]:nth-child(2) > tbody > tr > td[width="140"] > a[href$="cdc.gov/"]
  3. Confirm the axe-core finding for rule link-name against WCAG 2.4.4 Link Purpose (In Context).

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

…and more — all 112 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give the link discernible text. Avoid empty links and icon-only links without an aria-label.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/link-name?application=axeAPI

Critical axe label WCAG 2.0 A Form elements must have labels (WCAG 4.1.2) 68/1667 pages · 70 instances Likely template
Bug ID
VS-86f9c871
Pattern ID
VS-fafffee0
Combined ID
VS-86f9c871 (pattern VS-fafffee0) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
#searchBox
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<input id="searchBox" class="searchBox" name="query" maxlength="256" type="text" style="width: 230px;">

Description

Form elements must have labels. Detected by axe-core rule label on 68 of 1667 scanned pages (70 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5909a5.htm.
  2. Locate the element: #searchBox
  3. Confirm the axe-core finding for rule label against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

…and more — all 68 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Associate every form control with a <label> (via for/id) or an aria-label/aria-labelledby.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/label?application=axeAPI

Serious axe list WCAG 2.0 A <ul> and <ol> must only directly contain <li>, <script> or <template> elements (WCAG 1.3.1) 15/1667 pages · 42 instances Likely template
Bug ID
VS-6d1d3b81
Pattern ID
VS-a0bdbdf6
Combined ID
VS-6d1d3b81 (pattern VS-a0bdbdf6) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.3.1 Info and Relationships (Level A, WCAG 2.0)
XPath / selector
ol
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<ol>

Description

<ul> and <ol> must only directly contain <li>, <script> or <template> elements. Detected by axe-core rule list on 15 of 1667 scanned pages (42 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2019/19_0054.htm.
  2. Locate the element: ol
  3. Confirm the axe-core finding for rule list against WCAG 1.3.1 Info and Relationships.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Use <ul>/<ol> with only <li> children for lists; don't fake lists with <div>s.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/list?application=axeAPI

Serious axe link-in-text-block WCAG 2.0 A Links must be distinguishable without relying on color (WCAG 1.4.1) 15/1667 pages · 15 instances Likely template
Bug ID
VS-a91f5e8a
Pattern ID
VS-8ade3360
Combined ID
VS-a91f5e8a (pattern VS-8ade3360) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.4.1 Use of Color (Level A, WCAG 2.0)
XPath / selector
.all-pages
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<a class="all-pages" href="#toc">All pages <span class="cdc-fa-arrow-down-long"></span></a>

Description

Links must be distinguishable without relying on color. Detected by axe-core rule link-in-text-block on 15 of 1667 scanned pages (15 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/infection-control/hcp/healthcare-personnel-epidemiology-control/executive-summary.html.
  2. Locate the element: .all-pages
  3. Confirm the axe-core finding for rule link-in-text-block against WCAG 1.4.1 Use of Color.

Impact

Affects Without color perception (4.5%), Limited vision (2.4%).

  • Without color perception — 4.5% of population
  • Limited vision — 2.4% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/link-in-text-block?application=axeAPI

Serious axe nested-interactive WCAG 2.0 A Interactive controls must not be nested (WCAG 4.1.2) 14/1667 pages · 15 instances Likely template
Bug ID
VS-5d0b82bb
Pattern ID
VS-58301a87
Combined ID
VS-5d0b82bb (pattern VS-58301a87) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
#acc-header-2
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<div class="card-header h4 bg-white rounded-0 collapsed" role="tab" id="acc-header-2" href="#acc-panel-2" data-toggle="collapse" data-parent="#accordion-2" aria-controls="acc-panel-2" aria-expanded="f

Description

Interactive controls must not be nested. Detected by axe-core rule nested-interactive on 14 of 1667 scanned pages (15 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/tobacco/campaign/tips/groups/general-public.html.
  2. Locate the element: #acc-header-2
  3. Confirm the axe-core finding for rule nested-interactive against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Don't nest interactive controls (e.g. a button inside a link); split them apart.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/nested-interactive?application=axeAPI

Serious axe frame-title WCAG 2.0 A Frames must have an accessible name (WCAG 4.1.2) 12/1667 pages · 17 instances Likely template
Bug ID
VS-ecbde7d5
Pattern ID
VS-3f76c7ea
Combined ID
VS-ecbde7d5 (pattern VS-3f76c7ea) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
iframe
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<iframe src="//www.youtube-nocookie.com/embed/Dgt8tTw1AMM?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.

Description

Frames must have an accessible name. Detected by axe-core rule frame-title on 12 of 1667 scanned pages (17 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/fungal/php/guidance-investigating-outbreaks/mold-healthcare.html.
  2. Locate the element: iframe
  3. Confirm the axe-core finding for rule frame-title against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give every <iframe> a descriptive title attribute.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/frame-title?application=axeAPI

Serious axe blink WCAG 2.0 A <blink> elements are deprecated and must not be used (WCAG 2.2.2) 7/1667 pages · 7 instances
Bug ID
VS-50405ca1
Pattern ID
VS-4b45acfe
Combined ID
VS-50405ca1 (pattern VS-4b45acfe) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
2.2.2 Pause, Stop, Hide (Level A, WCAG 2.0)
XPath / selector
blink
History
first seen 2026-W25, last seen 2026-W26 (2 wk)

HTML snippet — use this to validate the finding without re-running the tool

<blink><big><strong>Disclaimer</strong></big></blink>

Description

<blink> elements are deprecated and must not be used. Detected by axe-core rule blink on 7 of 1667 scanned pages (7 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/rr5504a2.htm.
  2. Locate the element: blink
  3. Confirm the axe-core finding for rule blink against WCAG 2.2.2 Pause, Stop, Hide.

Impact

Affects Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/blink?application=axeAPI

Critical axe select-name WCAG 2.0 A Select element must have an accessible name (WCAG 4.1.2) 4/1667 pages · 6 instances
Bug ID
VS-54255e13
Pattern ID
VS-fab92378
Combined ID
VS-54255e13 (pattern VS-fab92378) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
#medicine
History
first seen 2026-W25, last seen 2026-W26 (2 wk)

HTML snippet — use this to validate the finding without re-running the tool

<select id="medicine" onchange="window.location = this.options[this.selectedIndex].value;">

Description

Select element must have an accessible name. Detected by axe-core rule select-name on 4 of 1667 scanned pages (6 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/tobacco/campaign/tips/spanish/dejar-fumar/medicamentos/como-usar-medicamentos/aerosol-nasal-de-nicotina.html.
  2. Locate the element: #medicine
  3. Confirm the axe-core finding for rule select-name against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give the <select> an accessible name via a <label> or aria-label.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/select-name?application=axeAPI

Serious axe scrollable-region-focusable WCAG 2.0 A Scrollable region must have keyboard access (WCAG 2.1.1) 4/1667 pages · 4 instances
Bug ID
VS-ea9842b5
Pattern ID
VS-c613c153
Combined ID
VS-ea9842b5 (pattern VS-c613c153) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
2.1.1 Keyboard (Level A, WCAG 2.0)
XPath / selector
.w-100.order-4:nth-child(28) > table
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<table class="table table-bordered table-responsive opt-in">

Description

Scrollable region must have keyboard access. Detected by axe-core rule scrollable-region-focusable on 4 of 1667 scanned pages (4 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/volumes/65/wr/mm6539a4.htm.
  2. Locate the element: .w-100.order-4:nth-child(28) > table
  3. Confirm the axe-core finding for rule scrollable-region-focusable against WCAG 2.1.1 Keyboard.

Impact

Affects Without vision (1.0%), Limited manipulation/strength (13.0%), Limited reach (2.0%).

  • Without vision — 1.0% of population
  • Limited manipulation/strength — 13.0% of population
  • Limited reach — 2.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Make scrollable regions keyboard-focusable (tabindex="0") so keyboard users can scroll them.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/scrollable-region-focusable?application=axeAPI

Serious axe td-headers-attr WCAG 2.0 A Table cell headers attributes must refer to other <th> elements in the same tabl (WCAG 1.3.1) 4/1667 pages · 4 instances
Bug ID
VS-71647ac2
Pattern ID
VS-07ba3b17
Combined ID
VS-71647ac2 (pattern VS-07ba3b17) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.3.1 Info and Relationships (Level A, WCAG 2.0)
XPath / selector
.cdc-textblock:nth-child(6) > .table-responsive > div > .main\|gray-l3.table-striped
History
first seen 2026-W25, last seen 2026-W26 (2 wk)

HTML snippet — use this to validate the finding without re-running the tool

<table class="table table-bordered table-striped main|gray-l3" width="623">

Description

Table cell headers attributes must refer to other <th> elements in the same tabl. Detected by axe-core rule td-headers-attr on 4 of 1667 scanned pages (4 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/yellow-book/hcp/preparing-international-travelers/travel-health-kits.html.
  2. Locate the element: .cdc-textblock:nth-child(6) > .table-responsive > div > .main\|gray-l3.table-striped
  3. Confirm the axe-core finding for rule td-headers-attr against WCAG 1.3.1 Info and Relationships.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Associate data cells with their headers correctly using headers/id or scope.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/td-headers-attr?application=axeAPI

Critical axe aria-allowed-attr WCAG 2.0 A Elements must only use supported ARIA attributes (WCAG 4.1.2) 2/1667 pages · 16 instances Likely content
Bug ID
VS-7e317440
Pattern ID
VS-1467ea8a
Combined ID
VS-7e317440 (pattern VS-1467ea8a) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
#natality-mortality-trends_dashboard_desc
History
first seen 2026-W25, last seen 2026-W26 (2 wk)

HTML snippet — use this to validate the finding without re-running the tool

<div class="text" id="natality-mortality-trends_dashboard_desc" aria-expanded="false" tabindex="-1">

Description

Elements must only use supported ARIA attributes. Detected by axe-core rule aria-allowed-attr on 2 of 1667 scanned pages (16 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/nchs/data-visualization.
  2. Locate the element: #natality-mortality-trends_dashboard_desc
  3. Confirm the axe-core finding for rule aria-allowed-attr against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Remove ARIA attributes that aren't allowed on this role/element.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/aria-allowed-attr?application=axeAPI

Critical axe aria-required-children WCAG 2.0 A Certain ARIA roles must contain particular children (WCAG 1.3.1) 2/1667 pages · 6 instances Likely content
Bug ID
VS-33b88b46
Pattern ID
VS-9429bb8d
Combined ID
VS-33b88b46 (pattern VS-9429bb8d) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.3.1 Info and Relationships (Level A, WCAG 2.0)
XPath / selector
#accordion-2
History
first seen 2026-W25, last seen 2026-W26 (2 wk)

HTML snippet — use this to validate the finding without re-running the tool

<div class="accordion indicator-plus accordion-white mb3" id="accordion-2" role="tablist">

Description

Certain ARIA roles must contain particular children. Detected by axe-core rule aria-required-children on 2 of 1667 scanned pages (6 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/cme/weekly_conted.html.
  2. Locate the element: #accordion-2
  3. Confirm the axe-core finding for rule aria-required-children against WCAG 1.3.1 Info and Relationships.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Add the child roles this container role requires (e.g. a list needs listitem children).

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/aria-required-children?application=axeAPI

Serious axe listitem WCAG 2.0 A <li> elements must be contained in a <ul> or <ol> (WCAG 1.3.1) 2/1667 pages · 20 instances Likely content
Bug ID
VS-f7820ea3
Pattern ID
VS-6175596b
Combined ID
VS-f7820ea3 (pattern VS-6175596b) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.3.1 Info and Relationships (Level A, WCAG 2.0)
XPath / selector
ul:nth-child(238) > b > li
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<li>Engage stakeholders</li>

Description

<li> elements must be contained in a <ul> or <ol>. Detected by axe-core rule listitem on 2 of 1667 scanned pages (20 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/rr4811a1.htm.
  2. Locate the element: ul:nth-child(238) > b > li
  3. Confirm the axe-core finding for rule listitem against WCAG 1.3.1 Info and Relationships.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: <li> must be inside a <ul> or <ol>.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/listitem?application=axeAPI

Serious axe aria-command-name WCAG 2.0 A ARIA commands must have an accessible name (WCAG 4.1.2) 2/1667 pages · 6 instances Likely content
Bug ID
VS-0bbd7039
Pattern ID
VS-5c82bd60
Combined ID
VS-0bbd7039 (pattern VS-5c82bd60) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
#id-r1- > .table-container > table > thead > tr > th:nth-child(1) > .sort-icon[role="button"]
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<span role="button" class="sort-icon"><svg class="up" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 10 5"><path d="M0 5l5-5 5 5z"></path></svg><svg class="down" xmlns="http://www.w3.org/2000/svg" vi

Description

ARIA commands must have an accessible name. Detected by axe-core rule aria-command-name on 2 of 1667 scanned pages (6 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/fragile-x-syndrome/data/index.html.
  2. Locate the element: #id-r1- > .table-container > table > thead > tr > th:nth-child(1) > .sort-icon[role="button"]
  3. Confirm the axe-core finding for rule aria-command-name against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give the command (button/link/menuitem) an accessible name via text or aria-label.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/aria-command-name?application=axeAPI

Critical axe button-name WCAG 2.0 A Buttons must have discernible text (WCAG 4.1.2) 1/1667 pages · 1 instances Likely content
Bug ID
VS-fd813a7e
Pattern ID
VS-e7298c00
Combined ID
VS-fd813a7e (pattern VS-e7298c00) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
#search__icon
History
first seen 2026-W26, last seen 2026-W26 (1 wk)

HTML snippet — use this to validate the finding without re-running the tool

<button id="search__icon" class="c-search__icon"></button>

Description

Buttons must have discernible text. Detected by axe-core rule button-name on 1 of 1667 scanned pages (1 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/hiv/es/about/acerca-del-vih.html.
  2. Locate the element: #search__icon
  3. Confirm the axe-core finding for rule button-name against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give the button an accessible name via its text content, aria-label, or aria-labelledby.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/button-name?application=axeAPI

Serious axe definition-list WCAG 2.0 A <dl> elements must only directly contain properly-ordered <dt> and <dd> groups, (WCAG 1.3.1) 1/1667 pages · 3 instances Likely content
Bug ID
VS-85326e08
Pattern ID
VS-4bcaa7bf
Combined ID
VS-85326e08 (pattern VS-4bcaa7bf) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.3.1 Info and Relationships (Level A, WCAG 2.0)
XPath / selector
dl:nth-child(330)
History
first seen 2026-W26, last seen 2026-W26 (1 wk)

HTML snippet — use this to validate the finding without re-running the tool

<dl>

Description

<dl> elements must only directly contain properly-ordered <dt> and <dd> groups, . Detected by axe-core rule definition-list on 1 of 1667 scanned pages (3 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/rr4811a1.htm.
  2. Locate the element: dl:nth-child(330)
  3. Confirm the axe-core finding for rule definition-list against WCAG 1.3.1 Info and Relationships.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/definition-list?application=axeAPI

Serious axe valid-lang WCAG 2.0 AA lang attribute must have a valid value (WCAG 3.1.2) 1/1667 pages · 2 instances Likely content
Bug ID
VS-6fda5385
Pattern ID
VS-dd1c019f
Combined ID
VS-6fda5385 (pattern VS-dd1c019f) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 AA
Obligation
required
Handling
review
WCAG SC
3.1.2 Language of Parts (Level AA, WCAG 2.0)
XPath / selector
.cdc-block-link[lang="__"][aria-label="View"]
History
first seen 2026-W24, last seen 2026-W26 (2 wk)

HTML snippet — use this to validate the finding without re-running the tool

<a aria-label="View" target="_blank" class="cdc-block-link" href="/natural-disasters/media/pdfs/2024/08/factsheet-wash-your-hands_Hawaiian-508.pdf" lang="__">

Description

lang attribute must have a valid value. Detected by axe-core rule valid-lang on 1 of 1667 scanned pages (2 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/natural-disasters/communication-resources/wash-your-hands-factsheet.html.
  2. Locate the element: .cdc-block-link[lang="__"][aria-label="View"]
  3. Confirm the axe-core finding for rule valid-lang against WCAG 3.1.2 Language of Parts.

Impact

Affects Without vision (1.0%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/valid-lang?application=axeAPI

Serious axe region Best Practice All page content should be contained by landmarks (WCAG criterion undetermined) 1544/1667 pages · 10188 instances Likely template
Bug ID
VS-36c41092
Pattern ID
VS-f18df681
Combined ID
VS-36c41092 (pattern VS-f18df681) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
small
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<small class="ml-2">An official website of the United States government <button class="cdc-header-official-notice-header-btn">Here's how you know <span class="cdc-header-official-notice-header-icon x1

Description

All page content should be contained by landmarks. Detected by axe-core rule region on 1544 of 1667 scanned pages (10188 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/laboratory/drugservice/index.html.
  2. Locate the element: small
  3. Confirm the axe-core finding for rule region.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 1544 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Wrap all page content in landmarks (header, nav, main, footer) so users can navigate by region.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/region?application=axeAPI

Serious axe label-title-only Best Practice Form elements should have a visible label (WCAG criterion undetermined) 65/1667 pages · 65 instances Likely template
Bug ID
VS-66702325
Pattern ID
VS-33841929
Combined ID
VS-66702325 (pattern VS-33841929) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
.smallfield
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<input class="smallfield" type="text" name="email" size="15" title="Insert e-mail" value="Insert e-mail" onfocus="this.value=''">

Description

Form elements should have a visible label. Detected by axe-core rule label-title-only on 65 of 1667 scanned pages (65 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: .smallfield
  3. Confirm the axe-core finding for rule label-title-only.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 65 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/label-title-only?application=axeAPI

Moderate alfa sia-r113 WCAG 2.2 AA Target size is at least 24×24 CSS pixels or has spacing (Minimum) (WCAG 2.5.8) 270/1667 pages · 2466 instances Likely template
Bug ID
VS-e1fd6438
Pattern ID
VS-179ad9b3
Combined ID
VS-e1fd6438 (pattern VS-179ad9b3) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.2 AA
Obligation
required
Handling
review
WCAG SC
2.5.8 Target Size (Minimum) (Level AA, WCAG 2.2)
XPath / selector
<a href="#nav-group-efe98" aria-controls="nav-group-efe98" class="nav-plus nav-expandcollapse" data-toggle="collapse">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Target size is at least 24×24 CSS pixels or has spacing (Minimum). Detected by Siteimprove Alfa rule sia-r113 on 270 of 1667 scanned pages (2466 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/laboratory/drugservice/index.html.
  2. Locate the element: <a href="#nav-group-efe98" aria-controls="nav-group-efe98" class="nav-plus nav-expandcollapse" data-toggle="collapse">
  3. Confirm the Siteimprove Alfa finding for rule sia-r113 against WCAG 2.5.8 Target Size (Minimum).

Impact

Affects Limited manipulation/strength (13.0%), Limited reach (2.0%), Limited vision (2.4%).

  • Limited manipulation/strength — 13.0% of population
  • Limited reach — 2.0% of population
  • Limited vision — 2.4% of population

Affected pages

…and more — all 270 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r113

Moderate alfa sia-r69 WCAG 2.0 AA Text has sufficient color contrast (Enhanced) (WCAG 1.4.3) 254/1667 pages · 1387 instances · possible duplicate Likely template
Bug ID
VS-b60c4acc
Pattern ID
VS-f7e99f4b
Combined ID
VS-b60c4acc (pattern VS-f7e99f4b) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 AA
Obligation
required
Handling
review
WCAG SC
1.4.3 Contrast (Minimum) (Level AA, WCAG 2.0)
XPath / selector
text: "Please note:"
History
first seen 2026-W24, last seen 2026-W26 (3 wk)
Possible duplicate
Same WCAG SC covered by axe report VS-2d4f050c (pattern VS-be8d563e). If axe and this engine flag the same element, the axe report takes precedence — mark this as duplicate in JIRA.

Description

Text has sufficient color contrast (Enhanced). Detected by Siteimprove Alfa rule sia-r69 on 254 of 1667 scanned pages (1387 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/volumes/71/wr/mm7117e1.htm?s_cid=mm7117e1_w.
  2. Locate the element: text: "Please note:"
  3. Confirm the Siteimprove Alfa finding for rule sia-r69 against WCAG 1.4.3 Contrast (Minimum).

Impact

Affects Limited vision (2.4%), Without color perception (4.5%).

  • Limited vision — 2.4% of population
  • Without color perception — 4.5% of population

Affected pages

…and more — all 254 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Increase text contrast to meet WCAG AA (4.5:1, or 3:1 for large text).

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r69

Moderate alfa sia-r2 WCAG 2.0 A Image has accessible name (WCAG 1.1.1) 136/1667 pages · 1456 instances · possible duplicate Likely template
Bug ID
VS-8f9b2adc
Pattern ID
VS-a24eaa8c
Combined ID
VS-8f9b2adc (pattern VS-a24eaa8c) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.1.1 Non-text Content (Level A, WCAG 2.0)
XPath / selector
<img src="http://www.cdc.gov/navimages/nav21.gif" border="0" alt=" " width="140">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)
Possible duplicate
Same WCAG SC covered by axe report VS-77adcdbc (pattern VS-9074b4dd). If axe and this engine flag the same element, the axe report takes precedence — mark this as duplicate in JIRA.

Description

Image has accessible name. Detected by Siteimprove Alfa rule sia-r2 on 136 of 1667 scanned pages (1456 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: <img src="http://www.cdc.gov/navimages/nav21.gif" border="0" alt=" " width="140">
  3. Confirm the Siteimprove Alfa finding for rule sia-r2 against WCAG 1.1.1 Non-text Content.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

…and more — all 136 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give every <img> an accessible name (alt text), or alt="" if purely decorative.

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r2

Moderate alfa sia-r4 WCAG 2.0 A Document has a valid lang attribute (WCAG 3.1.1) 127/1667 pages · 127 instances · possible duplicate Likely template
Bug ID
VS-d8f2f962
Pattern ID
VS-7a0e5645
Combined ID
VS-d8f2f962 (pattern VS-7a0e5645) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
3.1.1 Language of Page (Level A, WCAG 2.0)
XPath / selector
<html>
History
first seen 2026-W24, last seen 2026-W26 (3 wk)
Possible duplicate
Same WCAG SC covered by axe report VS-8f881ad8 (pattern VS-c126b6a6). If axe and this engine flag the same element, the axe report takes precedence — mark this as duplicate in JIRA.

Description

Document has a valid lang attribute. Detected by Siteimprove Alfa rule sia-r4 on 127 of 1667 scanned pages (127 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: <html>
  3. Confirm the Siteimprove Alfa finding for rule sia-r4 against WCAG 3.1.1 Language of Page.

Impact

Affects Without vision (1.0%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

…and more — all 127 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Add a valid lang attribute to <html>.

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r4

Moderate alfa sia-r68 WCAG 2.0 A Presentational children of an element are not focusable (WCAG 1.3.1) 111/1667 pages · 1559 instances Likely template
Bug ID
VS-41903d05
Pattern ID
VS-d6097011
Combined ID
VS-41903d05 (pattern VS-d6097011) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
1.3.1 Info and Relationships (Level A, WCAG 2.0)
XPath / selector
<ul>
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Presentational children of an element are not focusable. Detected by Siteimprove Alfa rule sia-r68 on 111 of 1667 scanned pages (1559 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/diabetes/es/signs-symptoms/sintomas-de-la-diabetes.html.
  2. Locate the element: <ul>
  3. Confirm the Siteimprove Alfa finding for rule sia-r68 against WCAG 1.3.1 Info and Relationships.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

…and more — all 111 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r68

Moderate alfa sia-r14 WCAG 2.1 A Accessible name of link or button matches visible label (WCAG 2.5.3) 96/1667 pages · 213 instances Likely template
Bug ID
VS-dbf28028
Pattern ID
VS-f7dba940
Combined ID
VS-dbf28028 (pattern VS-f7dba940) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.1 A
Obligation
required
Handling
review
WCAG SC
2.5.3 Label in Name (Level A, WCAG 2.1)
XPath / selector
<a data-action="print" href="#print" class="d-none d-md-block" aria-label="print this page">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Accessible name of link or button matches visible label. Detected by Siteimprove Alfa rule sia-r14 on 96 of 1667 scanned pages (213 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/vaccines-adults/es/recommended-vaccines/como-pagar-las-vacunas.html.
  2. Locate the element: <a data-action="print" href="#print" class="d-none d-md-block" aria-label="print this page">
  3. Confirm the Siteimprove Alfa finding for rule sia-r14 against WCAG 2.5.3 Label in Name.

Impact

Affects Without vision (1.0%), Without speech (0.5%).

  • Without vision — 1.0% of population
  • Without speech — 0.5% of population

Affected pages

…and more — all 96 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r14

Moderate alfa sia-r11 WCAG 2.0 A Link has accessible name (WCAG 2.4.4) 56/1667 pages · 115 instances · possible duplicate Likely template
Bug ID
VS-00716c32
Pattern ID
VS-28ebd979
Combined ID
VS-00716c32 (pattern VS-28ebd979) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
2.4.4 Link Purpose (In Context) (Level A, WCAG 2.0)
XPath / selector
<a href="http://www.cdc.gov/">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)
Possible duplicate
Same WCAG SC covered by axe report VS-b9794205 (pattern VS-e9fe47ac). If axe and this engine flag the same element, the axe report takes precedence — mark this as duplicate in JIRA.

Description

Link has accessible name. Detected by Siteimprove Alfa rule sia-r11 on 56 of 1667 scanned pages (115 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: <a href="http://www.cdc.gov/">
  3. Confirm the Siteimprove Alfa finding for rule sia-r11 against WCAG 2.4.4 Link Purpose (In Context).

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited cognitive, language, or learning ability (11.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited cognitive, language, or learning ability — 11.0% of population

Affected pages

…and more — all 56 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Give the link an accessible name via text content or aria-label.

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r11

Moderate alfa sia-r8 WCAG 2.0 A Form field has accessible name (WCAG 4.1.2) 36/1667 pages · 86 instances Likely template
Bug ID
VS-7f280d17
Pattern ID
VS-a48e6078
Combined ID
VS-7f280d17 (pattern VS-a48e6078) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
<input id="searchBox" class="searchBox" name="query" maxlength="256">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Form field has accessible name. Detected by Siteimprove Alfa rule sia-r8 on 36 of 1667 scanned pages (86 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5909a5.htm.
  2. Locate the element: <input id="searchBox" class="searchBox" name="query" maxlength="256">
  3. Confirm the Siteimprove Alfa finding for rule sia-r8 against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

…and more — all 36 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Associate the form field with a label.

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r8

Moderate alfa sia-r90 WCAG 2.0 A Component with same name serves same purpose (WCAG 4.1.2) 10/1667 pages · 11 instances Likely template
Bug ID
VS-95fd94e3
Pattern ID
VS-a2a3dffb
Combined ID
VS-95fd94e3 (pattern VS-a2a3dffb) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
4.1.2 Name, Role, Value (Level A, WCAG 2.0)
XPath / selector
<div class="card-header h4 bg-white rounded-0 collapsed" role="tab" id="acc-header-2" href="#acc-panel-2">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Component with same name serves same purpose. Detected by Siteimprove Alfa rule sia-r90 on 10 of 1667 scanned pages (11 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/tobacco/campaign/tips/groups/general-public.html.
  2. Locate the element: <div class="card-header h4 bg-white rounded-0 collapsed" role="tab" id="acc-header-2" href="#acc-panel-2">
  3. Confirm the Siteimprove Alfa finding for rule sia-r90 against WCAG 4.1.2 Name, Role, Value.

Impact

Affects Without vision (1.0%), Limited vision (2.4%), Limited manipulation/strength (13.0%).

  • Without vision — 1.0% of population
  • Limited vision — 2.4% of population
  • Limited manipulation/strength — 13.0% of population

Affected pages

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r90

Moderate alfa sia-r111 WCAG 2.x AAA Target size is at least 44×44 CSS pixels (Enhanced) (WCAG 2.5.5) 759/1667 pages · 23055 instances Likely template
Bug ID
VS-e1b9421f
Pattern ID
VS-cb53cc4d
Combined ID
VS-e1b9421f (pattern VS-cb53cc4d) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.x AAA
Obligation
aspirational
Handling
review
WCAG SC
2.5.5 Target Size (Enhanced) (Level AAA, WCAG 2.1)
XPath / selector
<a href="/infectious-diseases-labs/site.html" class="cdc-logo__title">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Target size is at least 44×44 CSS pixels (Enhanced). Detected by Siteimprove Alfa rule sia-r111 on 759 of 1667 scanned pages (23055 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/laboratory/drugservice/index.html.
  2. Locate the element: <a href="/infectious-diseases-labs/site.html" class="cdc-logo__title">
  3. Confirm the Siteimprove Alfa finding for rule sia-r111 against WCAG 2.5.5 Target Size (Enhanced).

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 759 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111

Moderate alfa sia-r66 WCAG 2.x AAA Text has enhanced contrast (WCAG 1.4.6) 665/1667 pages · 21315 instances Likely template
Bug ID
VS-e1ac5a30
Pattern ID
VS-646b1e0b
Combined ID
VS-e1ac5a30 (pattern VS-646b1e0b) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.x AAA
Obligation
aspirational
Handling
review
WCAG SC
1.4.6 Contrast (Enhanced) (Level AAA, WCAG 2.0)
XPath / selector
text: "An official website of the United States government "
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Text has enhanced contrast. Detected by Siteimprove Alfa rule sia-r66 on 665 of 1667 scanned pages (21315 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/laboratory/drugservice/index.html.
  2. Locate the element: text: "An official website of the United States government "
  3. Confirm the Siteimprove Alfa finding for rule sia-r66 against WCAG 1.4.6 Contrast (Enhanced).

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 665 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Increase text contrast to meet WCAG AAA (7:1).

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r66

Moderate alfa sia-r57 Undetermined Scrolling content can be accessed by keyboard (WCAG criterion undetermined) 588/1667 pages · 8315 instances Likely template
Bug ID
VS-6971f473
Pattern ID
VS-c18be945
Combined ID
VS-6971f473 (pattern VS-c18be945) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
XPath / selector
text: "Skip directly to search"
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Scrolling content can be accessed by keyboard. Detected by Siteimprove Alfa rule sia-r57 on 588 of 1667 scanned pages (8315 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/laboratory/drugservice/index.html.
  2. Locate the element: text: "Skip directly to search"
  3. Confirm the Siteimprove Alfa finding for rule sia-r57.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 588 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r57

Moderate axe heading-order Best Practice Heading levels should only increase by one (WCAG criterion undetermined) 549/1667 pages · 792 instances Likely template
Bug ID
VS-298745da
Pattern ID
VS-d25f622d
Combined ID
VS-298745da (pattern VS-d25f622d) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
h3
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<h3><strong>Summary</strong></h3>

Description

Heading levels should only increase by one. Detected by axe-core rule heading-order on 549 of 1667 scanned pages (792 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/volumes/71/wr/mm7117e1.htm?s_cid=mm7117e1_w.
  2. Locate the element: h3
  3. Confirm the axe-core finding for rule heading-order.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 549 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Use heading levels in order (h1 → h2 → h3) without skipping; structure, not size.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/heading-order?application=axeAPI

Moderate axe landmark-unique Best Practice Landmarks should have a unique role or role/label/title (i.e. accessible name) c (WCAG criterion undetermined) 467/1667 pages · 470 instances Likely template
Bug ID
VS-114a5603
Pattern ID
VS-8806389c
Combined ID
VS-114a5603 (pattern VS-8806389c) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
.page-right-rail__static
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<aside class="page-right-rail__static noindex" role="complementary" style="margin-top: 47px;">

Description

Landmarks should have a unique role or role/label/title (i.e. accessible name) c. Detected by axe-core rule landmark-unique on 467 of 1667 scanned pages (470 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/flu/prevention.
  2. Locate the element: .page-right-rail__static
  3. Confirm the axe-core finding for rule landmark-unique.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 467 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: 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.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/landmark-unique?application=axeAPI

Moderate alfa sia-r18 Undetermined aria attribute is permitted for element role (WCAG criterion undetermined) 384/1667 pages · 421 instances Likely template
Bug ID
VS-34d8d3d2
Pattern ID
VS-e05344b9
Combined ID
VS-34d8d3d2 (pattern VS-e05344b9) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
XPath / selector
@aria-label="Official website of the United States government"
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

aria attribute is permitted for element role. Detected by Siteimprove Alfa rule sia-r18 on 384 of 1667 scanned pages (421 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/vaccines/hcp/current-vis/rsv-iis.html.
  2. Locate the element: @aria-label="Official website of the United States government"
  3. Confirm the Siteimprove Alfa finding for rule sia-r18.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 384 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Only use ARIA states/properties that are allowed on this element/role.

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r18

Moderate axe landmark-one-main Best Practice Document should have one main landmark (WCAG criterion undetermined) 343/1667 pages · 343 instances Likely template
Bug ID
VS-be2f597b
Pattern ID
VS-d5d82446
Combined ID
VS-be2f597b (pattern VS-d5d82446) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
html
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<html>

Description

Document should have one main landmark. Detected by axe-core rule landmark-one-main on 343 of 1667 scanned pages (343 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: html
  3. Confirm the axe-core finding for rule landmark-one-main.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 343 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Each page should have exactly one <main> landmark.

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/landmark-one-main?application=axeAPI

Moderate alfa sia-r53 Undetermined Headings are structured hierarchically (WCAG criterion undetermined) 280/1667 pages · 406 instances Likely template
Bug ID
VS-9c8f6cb4
Pattern ID
VS-f054f4a4
Combined ID
VS-9c8f6cb4 (pattern VS-f054f4a4) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
XPath / selector
<h3>
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Headings are structured hierarchically. Detected by Siteimprove Alfa rule sia-r53 on 280 of 1667 scanned pages (406 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/volumes/71/wr/mm7117e1.htm?s_cid=mm7117e1_w.
  2. Locate the element: <h3>
  3. Confirm the Siteimprove Alfa finding for rule sia-r53.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 280 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Use headings in a logical, non-skipping order.

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r53

Moderate alfa sia-r74 WCAG 2.x AAA Link is distinguishable without relying on color (WCAG 1.4.8) 241/1667 pages · 3538 instances Likely template
Bug ID
VS-f08a3eff
Pattern ID
VS-fbf54eba
Combined ID
VS-f08a3eff (pattern VS-fbf54eba) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.x AAA
Obligation
aspirational
Handling
review
WCAG SC
1.4.8 Visual Presentation (Level AAA, WCAG 2.0)
XPath / selector
<p class="peerreviewed">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Link is distinguishable without relying on color. Detected by Siteimprove Alfa rule sia-r74 on 241 of 1667 scanned pages (3538 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2023/22_0210a.htm.
  2. Locate the element: <p class="peerreviewed">
  3. Confirm the Siteimprove Alfa finding for rule sia-r74 against WCAG 1.4.8 Visual Presentation.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 241 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r74

Moderate alfa sia-r73 WCAG 2.x AAA Text has minimum contrast ratio of 4.5:1 (WCAG 1.4.8) 233/1667 pages · 49520 instances Likely template
Bug ID
VS-f9614fa8
Pattern ID
VS-2208081b
Combined ID
VS-f9614fa8 (pattern VS-2208081b) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.x AAA
Obligation
aspirational
Handling
review
WCAG SC
1.4.8 Visual Presentation (Level AAA, WCAG 2.0)
XPath / selector
<p class="peerreviewed">
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Text has minimum contrast ratio of 4.5:1. Detected by Siteimprove Alfa rule sia-r73 on 233 of 1667 scanned pages (49520 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2023/22_0210a.htm.
  2. Locate the element: <p class="peerreviewed">
  3. Confirm the Siteimprove Alfa finding for rule sia-r73 against WCAG 1.4.8 Visual Presentation.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 233 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r73

Moderate alfa sia-r70 Undetermined No obsolete or deprecated elements are used (WCAG criterion undetermined) 157/1667 pages · 157 instances Likely template
Bug ID
VS-e049b988
Pattern ID
VS-3d033717
Combined ID
VS-e049b988 (pattern VS-3d033717) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
advisory
Handling
review
WCAG SC
undetermined
XPath / selector
{"type":"document","children":[{"type":"type","name":"html","publicId":"-//W3C//
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

No obsolete or deprecated elements are used. Detected by Siteimprove Alfa rule sia-r70 on 157 of 1667 scanned pages (157 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2008/oct/08_0080.htm.
  2. Locate the element: {"type":"document","children":[{"type":"type","name":"html","publicId":"-//W3C//
  3. Confirm the Siteimprove Alfa finding for rule sia-r70.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 157 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r70

Moderate alfa sia-r78 Undetermined Table header has scope (WCAG criterion undetermined) 77/1667 pages · 84 instances Likely template
Bug ID
VS-7ac0c599
Pattern ID
VS-2cd767ca
Combined ID
VS-7ac0c599 (pattern VS-2cd767ca) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
XPath / selector
<h5>
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Table header has scope. Detected by Siteimprove Alfa rule sia-r78 on 77 of 1667 scanned pages (84 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/volumes/65/wr/mm6535a1.htm?s_cid=mm6535a1_w.
  2. Locate the element: <h5>
  3. Confirm the Siteimprove Alfa finding for rule sia-r78.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 77 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r78

Moderate axe page-has-heading-one Best Practice Page should contain a level-one heading (WCAG criterion undetermined) 73/1667 pages · 73 instances Likely template
Bug ID
VS-721c54c6
Pattern ID
VS-fa44f293
Combined ID
VS-721c54c6 (pattern VS-fa44f293) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
html
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<html lang="en-us" class="cdc-theme-cdc cdc-page-type--content">

Description

Page should contain a level-one heading. Detected by axe-core rule page-has-heading-one on 73 of 1667 scanned pages (73 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/comprehensive-cancer-control/site.html.
  2. Locate the element: html
  3. Confirm the axe-core finding for rule page-has-heading-one.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 73 pages (CSV).

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/page-has-heading-one?application=axeAPI

Moderate alfa sia-r61 Undetermined Form field label is visible (WCAG criterion undetermined) 68/1667 pages · 68 instances Likely template
Bug ID
VS-387a9191
Pattern ID
VS-7118fead
Combined ID
VS-387a9191 (pattern VS-7118fead) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
XPath / selector
{"type":"document","children":[{"type":"type","name":"html","publicId":"-//W3C//
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Form field label is visible. Detected by Siteimprove Alfa rule sia-r61 on 68 of 1667 scanned pages (68 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5909a5.htm.
  2. Locate the element: {"type":"document","children":[{"type":"type","name":"html","publicId":"-//W3C//
  3. Confirm the Siteimprove Alfa finding for rule sia-r61.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 68 pages (CSV).

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r61

Moderate deprecated-html presentational-attr Undetermined Presentational attribute (use CSS) (WCAG criterion undetermined) 38/1667 pages · 5482 instances Likely template
Bug ID
VS-68b85670
Pattern ID
VS-04a9d28c
Combined ID
VS-68b85670 (pattern VS-04a9d28c) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
Rule
deprecated-html — Presentational attribute (use CSS) [presentational-attr]
XPath / selector
th
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<th class="row1left" rowspan="2" scope="col" align="left" valign="bottom">Survey item</th>

Description

Presentational attribute (use CSS). Detected by deprecated-html rule presentational-attr on 38 of 1667 scanned pages (5482 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2023/22_0210a.htm.
  2. Locate the element: th
  3. Confirm the deprecated-html finding for rule presentational-attr.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 38 pages (CSV).

Testing environment

Automated: deprecated-html, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

Not captured by automated scan — requires manual testing.

Minor axe empty-table-header Best Practice Table header text should not be empty (WCAG criterion undetermined) 22/1667 pages · 48 instances Likely template
Bug ID
VS-6e39cef3
Pattern ID
VS-d69fc059
Combined ID
VS-6e39cef3 (pattern VS-d69fc059) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
th[colspan="5"]
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<th colspan="5"><!-- --></th>

Description

Table header text should not be empty. Detected by axe-core rule empty-table-header on 22 of 1667 scanned pages (48 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/niosh/idlh/309002.html.
  2. Locate the element: th[colspan="5"]
  3. Confirm the axe-core finding for rule empty-table-header.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/empty-table-header?application=axeAPI

Moderate alfa sia-r60 Undetermined Input purpose can be determined (WCAG criterion undetermined) 20/1667 pages · 20 instances Likely template
Bug ID
VS-f0b860a4
Pattern ID
VS-3fb891c5
Combined ID
VS-f0b860a4 (pattern VS-3fb891c5) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
XPath / selector
<fieldset>
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

Description

Input purpose can be determined. Detected by Siteimprove Alfa rule sia-r60 on 20 of 1667 scanned pages (20 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2012/11_0015_es.htm.
  2. Locate the element: <fieldset>
  3. Confirm the Siteimprove Alfa finding for rule sia-r60.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

Testing environment

Automated: Siteimprove Alfa, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

See remediation guidance: https://alfa.siteimprove.com/rules/sia-r60

Moderate deprecated-html font-element Undetermined Obsolete <font> element (use CSS) (WCAG criterion undetermined) 18/1667 pages · 168 instances Likely template
Bug ID
VS-ade15a1d
Pattern ID
VS-91d2294a
Combined ID
VS-ade15a1d (pattern VS-91d2294a) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
Rule
deprecated-html — Obsolete <font> element (use CSS) [font-element]
XPath / selector
font
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<font size="3" face="Arial, Helvetica, Verdana" color="#FFFFFF"><i><b>Weekly</b></i></font>

Description

Obsolete <font> element (use CSS). Detected by deprecated-html rule font-element on 18 of 1667 scanned pages (168 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5735a1.htm.
  2. Locate the element: font
  3. Confirm the deprecated-html finding for rule font-element.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

Testing environment

Automated: deprecated-html, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

Not captured by automated scan — requires manual testing.

Moderate axe skip-link Best Practice The skip-link target should exist and be focusable (WCAG criterion undetermined) 18/1667 pages · 18 instances Likely template
Bug ID
VS-51623b92
Pattern ID
VS-4edfe386
Combined ID
VS-51623b92 (pattern VS-4edfe386) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Best Practice
Obligation
advisory
Handling
review
WCAG SC
Best Practice — not a WCAG requirement
XPath / selector
a[href$="#az"]
History
first seen 2026-W24, last seen 2026-W26 (3 wk)

HTML snippet — use this to validate the finding without re-running the tool

<a href="#az" class="skippy" title="Salte directo al listado de A-Z">Salte directo al listado de A-Z</a>

Description

The skip-link target should exist and be focusable. Detected by axe-core rule skip-link on 18 of 1667 scanned pages (18 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2012/11_0015_es.htm.
  2. Locate the element: a[href$="#az"]
  3. Confirm the axe-core finding for rule skip-link.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

Testing environment

Automated: axe-core, headless Chromium (Playwright). Manual AT verification: Not captured by automated scan — requires manual testing.

Suggested fix

How to fix: Ensure the skip link targets a real, focusable element (its href must match an existing id).

See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/skip-link?application=axeAPI

24 more lower-priority finding(s) — summary only

Full detail — steps, affected pages, snippets — for these and every finding is in the CSV.

SeverityFindingWCAG categoryPages
Minor ARIA role should be appropriate for the element (WCAG criterion undetermined) [aria-allowed-role] Best Practice 18
Moderate Duplicate role landmark is labeled (WCAG criterion undetermined) [sia-r79] Undetermined 15
Moderate Obsolete <big> element (use CSS) (WCAG criterion undetermined) [big-element] Undetermined 12
Moderate scope attribute should be used correctly (WCAG criterion undetermined) [scope-attr-valid] Best Practice 9
Minor Headings should not be empty (WCAG criterion undetermined) [empty-heading] Best Practice 8
Moderate Element has required aria-owns (WCAG 1.3.1) [sia-r46] WCAG 2.0 A 6
Moderate Obsolete <center> element (use CSS) (WCAG criterion undetermined) [center-element] Undetermined 6
Moderate Table cell has header (WCAG 1.3.1) [sia-r77] WCAG 2.0 A 5
Moderate Scrollable element is keyboard accessible (WCAG 1.4.8) [sia-r80] WCAG 2.x AAA 5
Moderate Element has required owned roles (WCAG 1.3.1) [sia-r64] WCAG 2.0 A 4
Moderate Tables are used for tabular data, not layout (WCAG criterion undetermined) [sia-r40] Undetermined 4
Moderate aria-hidden element is not exposed to assistive technology (WCAG 1.3.1) [sia-r45] WCAG 2.0 A 3
Moderate Keyboard trap does not exist (WCAG criterion undetermined) [sia-r85] Undetermined 3
Moderate Element role is consistent with ARIA landmark (WCAG criterion undetermined) [sia-r72] Undetermined 2
Moderate Link in text block is visually distinguishable without color (WCAG 1.4.1) [sia-r62] WCAG 2.0 A 2
Moderate Form field error is identified and described (WCAG criterion undetermined) [sia-r75] Undetermined 2
Moderate Element with orientation is not locked (WCAG criterion undetermined) [sia-r59] Undetermined 2
Moderate First focusable element is link to main content (WCAG criterion undetermined) [sia-r87] Undetermined 2
Moderate Button has accessible name (WCAG 4.1.2) [sia-r12] WCAG 2.0 A 1
Moderate Assertive live region is marked as atomic (WCAG criterion undetermined) [sia-r54] Undetermined 1
Moderate Info and Relationships (WCAG 1.3.1) [sia-r76] WCAG 2.0 A 1
Moderate Obsolete <blink> element (WCAG criterion undetermined) [blink-element] Undetermined 1
Minor Tables should not have the same summary and caption (WCAG criterion undetermined) [table-duplicate-name] Best Practice 1
Minor Alternative text of images should not be repeated as text (WCAG criterion undetermined) [image-redundant-alt] Best Practice 1

Deque axe-core findings

Rule-level axe-core summary (33 rule type(s))

Each failing rule links out to the axe-core documentation. For full element-level detail including HTML snippets and XPaths, see the bug reports above.

axe-core rules failing in 2026-W26, by pages affected
RuleImpactPages affectedInstancesExample pagesAll affected
All page content should be contained by landmarks [region] moderate 1544 10188 /laboratory/drugservice/index.html
/natural-disasters/communication-resources/getting-rid-of-cleaning-products-and-other-chemicals-factsheet.html
/mmwr/volumes/71/wr/mm7117e1.htm		 all 1544 pages (CSV)
Heading levels should only increase by one [heading-order] moderate 549 792 /mmwr/volumes/71/wr/mm7117e1.htm
/pcd/issues/2008/oct/08_0080.htm
/nhsn/faqs/faq-au.html		 all 549 pages (CSV)
Landmarks should have a unique role or role/label/title (i.e. accessible name) combination [landmark-unique] moderate 467 470 /flu/prevention
/hpv/about/cancers-caused-by-hpv.html
/vaccines/hcp/current-vis/rsv-iis.html		 all 467 pages (CSV)
Document should have one main landmark [landmark-one-main] moderate 343 343 /pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/mm5909a5.htm
/mmwr/preview/mmwrhtml/00047023.htm		 all 343 pages (CSV)
Elements must meet minimum color contrast ratio thresholds [color-contrast] serious 286 393 /mmwr/volumes/71/wr/mm7117e1.htm
/mmwr/preview/mmwrhtml/mm5909a5.htm
/mmwr/preview/mmwrhtml/00047023.htm		 all 286 pages (CSV)
Images must have alternative text [image-alt] critical 260 2789 /pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/00047023.htm
/mmwr/preview/mmwrhtml/mm5711md.htm		 all 260 pages (CSV)
<html> element must have a lang attribute [html-has-lang] serious 247 247 /pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/00047023.htm
/mmwr/preview/mmwrhtml/mm5711md.htm		 all 247 pages (CSV)
Links must have discernible text [link-name] serious 112 221 /pcd/issues/2008/oct/08_0080.htm
/pcd/issues/2011/nov/11_0032.htm
/pcd/issues/2009/jan/07_0227.htm		 all 112 pages (CSV)
Page should contain a level-one heading [page-has-heading-one] moderate 73 73 /comprehensive-cancer-control/site.html
/vitalsigns/respectful-maternity-care/index.html
/niosh/cold-stress/site.html		 all 73 pages (CSV)
Form elements must have labels [label] critical 68 70 /mmwr/preview/mmwrhtml/mm5909a5.htm
/mmwr/preview/mmwrhtml/mm6033a3.htm
/mmwr/preview/mmwrhtml/mm6023a3.htm		 all 68 pages (CSV)
Form elements should have a visible label [label-title-only] serious 65 65 /pcd/issues/2008/oct/08_0080.htm
/pcd/issues/2011/nov/11_0032.htm
/pcd/issues/2009/jan/07_0227.htm		 all 65 pages (CSV)
Table header text should not be empty [empty-table-header] minor 22 48 /niosh/idlh/309002.html
/mmwr/preview/mmwrhtml/rr6204a1.htm
/pcd/issues/2008/oct/07_0156.htm		 all 22 pages (CSV)
ARIA role should be appropriate for the element [aria-allowed-role] minor 18 25 /vitalsigns/respectful-maternity-care/index.html
/spanish/NIOSH/docs/2011-133_sp
/niosh/docs/2021-101		 all 18 pages (CSV)
The skip-link target should exist and be focusable [skip-link] moderate 18 18 /pcd/issues/2012/11_0015_es.htm
/pcd/issues/2012/11_0110_es.htm
/pcd/issues/2012/11_0080_es.htm		 all 18 pages (CSV)
<ul> and <ol> must only directly contain <li>, <script> or <template> elements [list] serious 15 42 /pcd/issues/2019/19_0054.htm
/mmwr/preview/mmwrhtml/rr4811a1.htm
/mmwr/preview/mmwrhtml/00001909.htm		 all 15 pages (CSV)
Links must be distinguishable without relying on color [link-in-text-block] serious 15 15 /infection-control/hcp/healthcare-personnel-epidemiology-control/executive-summary.html
/infection-control/hcp/healthcare-personnel-epidemiology-control/contributors-and-acknowledgements.html
/vaccine-safety/about/fainting.html		 all 15 pages (CSV)
Interactive controls must not be nested [nested-interactive] serious 14 15 /tobacco/campaign/tips/groups/general-public.html
/covid/php/antibody-seroprevalence/index.html
/tobacco/campaign/tips/groups/people-with-mental-health-conditions.html		 all 14 pages (CSV)
Frames must have an accessible name [frame-title] serious 12 17 /fungal/php/guidance-investigating-outbreaks/mold-healthcare.html
/prediabetes/risktest/index.html
/cervical-cancer/es/screening/index.html		 all 12 pages (CSV)
scope attribute should be used correctly [scope-attr-valid] moderate 9 64 /hpv/about/cancers-caused-by-hpv.html
/statesystem/glossaryandmethodology.html
/pcd/issues/2016/15_0244.htm		 all 9 pages (CSV)
Headings should not be empty [empty-heading] minor 8 8 /nhsn/faqs/faq-au.html
/statesystem/glossaryandmethodology.html
/mmwr/preview/mmwrhtml/mm5716a1.htm		 all 8 pages (CSV)
<blink> elements are deprecated and must not be used [blink] serious 7 7 /mmwr/preview/mmwrhtml/rr5504a2.htm
/mmwr/preview/mmwrhtml/rr4811a1.htm
/mmwr/preview/mmwrhtml/mm5618a7.htm		 all 7 pages (CSV)
Select element must have an accessible name [select-name] critical 4 6 /tobacco/campaign/tips/spanish/dejar-fumar/medicamentos/como-usar-medicamentos/aerosol-nasal-de-nicotina.html
/tobacco/campaign/tips/quit-smoking/quit-smoking-medications/how-to-use-quit-smoking-medicines/how-to-use-the-nicotine-lozenge.html
/tobacco/campaign/tips/quit-smoking/quit-smoking-medications/how-to-use-quit-smoking-medicines/how-to-combine-medicines.html		 all 4 pages (CSV)
Table cell headers attributes must refer to other <th> elements in the same table [td-headers-attr] serious 4 4 /yellow-book/hcp/preparing-international-travelers/travel-health-kits.html
/brfss/acbs/2024/prevalence_tables/table2b_LLCP.html
/vaccines/imz-schedules/adolescent-easyread-es.html		 all 4 pages (CSV)
Scrollable region must have keyboard access [scrollable-region-focusable] serious 4 4 /mmwr/volumes/65/wr/mm6539a4.htm
/nchs/data-analysis-tools/urban-rural.html
/cholera/es/prevention/cholera-vaccines.html		 all 4 pages (CSV)
<li> elements must be contained in a <ul> or <ol> [listitem] serious 2 20 /mmwr/preview/mmwrhtml/rr4811a1.htm
/physicalactivity/basics/index.htm		 all 2 pages (CSV)
Elements must only use supported ARIA attributes [aria-allowed-attr] critical 2 16 /nchs/data-visualization
/niosh/engcontrols/about/index.html		 all 2 pages (CSV)
ARIA commands must have an accessible name [aria-command-name] serious 2 6 /fragile-x-syndrome/data/index.html
/global-hiv-tb/php/our-approach/strengthening-laboratory-systems-outbreak-response.html		 all 2 pages (CSV)
Certain ARIA roles must contain particular children [aria-required-children] critical 2 6 /mmwr/cme/weekly_conted.html
/free-mind/card-game/facts-and-feels/index.html		 all 2 pages (CSV)
<dl> elements must only directly contain properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements [definition-list] serious 1 3 /mmwr/preview/mmwrhtml/rr4811a1.htm all 1 pages (CSV)
Tables should not have the same summary and caption [table-duplicate-name] minor 1 2 /nchs/data-visualization all 1 pages (CSV)
lang attribute must have a valid value [valid-lang] serious 1 2 /natural-disasters/communication-resources/wash-your-hands-factsheet.html all 1 pages (CSV)
Alternative text of images should not be repeated as text [image-redundant-alt] minor 1 1 /statesystem/glossaryandmethodology.html all 1 pages (CSV)
Buttons must have discernible text [button-name] critical 1 1 /hiv/es/about/acerca-del-vih.html all 1 pages (CSV)

Siteimprove Alfa findings

Rule-level Alfa summary (36 rule type(s))

Rule-level summary from Siteimprove Alfa (W3C ACT-based). Findings that overlap with axe-core on the same WCAG success criterion are noted as possible duplicates in the bug reports above.

Alfa rules failing in 2026-W26, by pages affected
RuleImpactPages affectedInstancesExample pagesAll affected
Target size is at least 44×44 CSS pixels (Enhanced) [sia-r111] n/a 759 23055 /laboratory/drugservice/index.html
/mmwr/volumes/71/wr/mm7117e1.htm
/pcd/issues/2023/22_0210a.htm		 all 759 pages (CSV)
Text has enhanced contrast [sia-r66] n/a 665 21315 /laboratory/drugservice/index.html
/mmwr/volumes/71/wr/mm7117e1.htm
/pcd/issues/2023/22_0210a.htm		 all 665 pages (CSV)
Scrolling content can be accessed by keyboard [sia-r57] n/a 588 8315 /laboratory/drugservice/index.html
/mmwr/volumes/71/wr/mm7117e1.htm
/pcd/issues/2023/22_0210a.htm		 all 588 pages (CSV)
aria attribute is permitted for element role [sia-r18] n/a 384 421 /vaccines/hcp/current-vis/rsv-iis.html
/vaccines-adults/es/recommended-vaccines/como-pagar-las-vacunas.html
/vaccine-safety/hcp/clinical-safety/index.html		 all 384 pages (CSV)
Headings are structured hierarchically [sia-r53] n/a 280 406 /mmwr/volumes/71/wr/mm7117e1.htm
/pcd/issues/2008/oct/08_0080.htm
/vitalsigns/respectful-maternity-care/index.html		 all 280 pages (CSV)
Target size is at least 24×24 CSS pixels or has spacing (Minimum) [sia-r113] n/a 270 2466 /laboratory/drugservice/index.html
/pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/mm5909a5.htm		 all 270 pages (CSV)
Text has sufficient color contrast (Enhanced) [sia-r69] n/a 254 1387 /mmwr/volumes/71/wr/mm7117e1.htm
/vaccines/hcp/current-vis/rsv-iis.html
/vaccines-adults/es/recommended-vaccines/como-pagar-las-vacunas.html		 all 254 pages (CSV)
Link is distinguishable without relying on color [sia-r74] n/a 241 3538 /pcd/issues/2023/22_0210a.htm
/pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/mm5711md.htm		 all 241 pages (CSV)
Text has minimum contrast ratio of 4.5:1 [sia-r73] n/a 233 49520 /pcd/issues/2023/22_0210a.htm
/pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/mm5909a5.htm		 all 233 pages (CSV)
No obsolete or deprecated elements are used [sia-r70] n/a 157 157 /pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/mm5909a5.htm
/mmwr/preview/mmwrhtml/mm5711md.htm		 all 157 pages (CSV)
Image has accessible name [sia-r2] n/a 136 1456 /pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/mm5711md.htm
/mmwr/preview/mmwrhtml/00000800.htm		 all 136 pages (CSV)
Document has a valid lang attribute [sia-r4] n/a 127 127 /pcd/issues/2008/oct/08_0080.htm
/mmwr/preview/mmwrhtml/mm5711md.htm
/mmwr/preview/mmwrhtml/00000800.htm		 all 127 pages (CSV)
Presentational children of an element are not focusable [sia-r68] n/a 111 1559 /diabetes/es/signs-symptoms/sintomas-de-la-diabetes.html
/global-hiv-tb/php/our-approach/index.html
/primary-immunodeficiency/about		 all 111 pages (CSV)
Accessible name of link or button matches visible label [sia-r14] n/a 96 213 /vaccines-adults/es/recommended-vaccines/como-pagar-las-vacunas.html
/diabetes/es/signs-symptoms/sintomas-de-la-diabetes.html
/spanish/NIOSH/docs/2011-133_sp		 all 96 pages (CSV)
Table header has scope [sia-r78] n/a 77 84 /mmwr/volumes/65/wr/mm6535a1.htm
/statesystem/glossaryandmethodology.html
/niosh/docket/archive/docket321.html		 all 77 pages (CSV)
Form field label is visible [sia-r61] n/a 68 68 /mmwr/preview/mmwrhtml/mm5909a5.htm
/vitalsigns/respectful-maternity-care/index.html
/mmwr/preview/mmwrhtml/mm6033a3.htm		 all 68 pages (CSV)
Link has accessible name [sia-r11] n/a 56 115 /pcd/issues/2008/oct/08_0080.htm
/pcd/issues/2011/nov/11_0032.htm
/pcd/issues/2009/jan/07_0227.htm		 all 56 pages (CSV)
Form field has accessible name [sia-r8] n/a 36 86 /mmwr/preview/mmwrhtml/mm5909a5.htm
/mmwr/preview/mmwrhtml/mm6033a3.htm
/mmwr/preview/mmwrhtml/mm5934a3.htm		 all 36 pages (CSV)
Input purpose can be determined [sia-r60] n/a 20 20 /pcd/issues/2012/11_0015_es.htm
/pcd/es/archive_es.htm
/mmwr/preview/ind2004_su.html		 all 20 pages (CSV)
Duplicate role landmark is labeled [sia-r79] n/a 15 57 /mmwr/preview/mmwrhtml/00050448.htm
/mmwr/preview/mmwrhtml/00045731.htm
/mmwr/preview/mmwrhtml/00056071.htm		 all 15 pages (CSV)
Component with same name serves same purpose [sia-r90] n/a 10 11 /tobacco/campaign/tips/groups/general-public.html
/tobacco/campaign/tips/groups/people-with-mental-health-conditions.html
/nhsn/newsletters/index.html		 all 10 pages (CSV)
Element has required aria-owns [sia-r46] n/a 6 68 /brfss/acbs/2023/prevalence_tables/table8_LLCP.html
/yellow-book/hcp/preparing-international-travelers/travel-health-kits.html
/pcd/issues/2016/16_0221.htm		 all 6 pages (CSV)
Table cell has header [sia-r77] n/a 5 9287 /mmwr/preview/mmwrhtml/mm6026md.htm
/mmwr/preview/mmwrhtml/mm6005md.htm
/nchs/data-analysis-tools/urban-rural.html		 all 5 pages (CSV)
Scrollable element is keyboard accessible [sia-r80] n/a 5 382 /pcd/collections/Global_Response_Cardiovascular_Disease.htm
/pcd/collections/Rural_Health_Disparities.htm
/pcd/issues/2016/2016_TOC.htm		 all 5 pages (CSV)
Element has required owned roles [sia-r64] n/a 4 4 /statesystem/glossaryandmethodology.html
/mmwr/preview/mmwrhtml/mm5651a4.htm
/mmwr/preview/mmwrhtml/mm5642a5.htm		 all 4 pages (CSV)
Tables are used for tabular data, not layout [sia-r40] n/a 4 4 /global-health/resources/global-health-center-fact-sheet.html
/nchs/data-analysis-tools/urban-rural.html
/maternal-mortality/php/erase-mm		 all 4 pages (CSV)
aria-hidden element is not exposed to assistive technology [sia-r45] n/a 3 23 /yellow-book/hcp/preparing-international-travelers/travel-health-kits.html
/vaccines/imz-schedules/adolescent-easyread-es.html
/childvaxview/publications-resources/nis-child-2018-2020.html		 all 3 pages (CSV)
Keyboard trap does not exist [sia-r85] n/a 3 3 /han/2023/han00492.html
/han/2023/han00493.html
/tobacco/campaign/tips/spanish/dejar-fumar/medicamentos/historias-para-dejar-de-fumar/daniel.html		 all 3 pages (CSV)
Element role is consistent with ARIA landmark [sia-r72] n/a 2 154 /nchs/covid19/npals/adsc.htm
/pcd/es/2012_toc.htm		 all 2 pages (CSV)
Link in text block is visually distinguishable without color [sia-r62] n/a 2 15 /tobacco/campaign/tips/groups/general-public.html
/tobacco/campaign/tips/diseases/periodontal-gum-disease.html		 all 2 pages (CSV)
Form field error is identified and described [sia-r75] n/a 2 12 /mmwr/preview/mmwrhtml/mm5909a5.htm
/mmwr/preview/mmwrhtml/mm5915a7.htm		 all 2 pages (CSV)
Element with orientation is not locked [sia-r59] n/a 2 2 /pcd/issues/2008/oct/bmscp_map.htm
/niosh/firefighters/registry/dashboard.html		 all 2 pages (CSV)
First focusable element is link to main content [sia-r87] n/a 2 2 /pcd/issues/2008/oct/bmscp_map.htm
/niosh/firefighters/registry/dashboard.html		 all 2 pages (CSV)
Button has accessible name [sia-r12] n/a 1 4 /fragile-x-syndrome/data/index.html all 1 pages (CSV)
Assertive live region is marked as atomic [sia-r54] n/a 1 2 /fragile-x-syndrome/data/index.html all 1 pages (CSV)
sia-r76 n/a 1 1 /yellow-book/hcp/travelers-with-additional-considerations/travelers-with-hiv.html all 1 pages (CSV)

Unique accessibility issues (axe + Alfa consolidated)

axe and Alfa both implement W3C ACT rules, so the same issue is often caught by both. These are deduplicated by ACT rule and page, so a shared finding counts once (8803 raw engine findings → 8441 unique).

Unique issues (rule × page)
8441
Caught by both engines
362 highest confidence
axe only
3815
Alfa only
4264
8 rule type(s) caught by both engines — highest confidence

Two independent ACT-rule implementations (Deque axe-core and Siteimprove Alfa) flagged the same issue on the same pages. Agreement between separate engines is strong evidence the barrier is real, not a single-tool false positive — the best place to start.

Rules flagged by both axe-core and Alfa in 2026-W26, by pages affected.
IssuePagesRule references
Elements must only use supported ARIA attributes385axe aria-allowed-attr · Alfa sia-r18 · ACT 5c01ea
Images must have alternative text260axe image-alt · Alfa sia-r2 · ACT 23a2a8
<html> element must have a lang attribute247axe html-has-lang · Alfa sia-r4 · ACT b5c3f8
Links must have discernible text112axe link-name · Alfa sia-r11 · ACT c487ae
Form elements must have labels74axe label · Alfa sia-r8 · ACT e086e5
Headings should not be empty8axe empty-heading · Alfa sia-r64 · ACT ffd0e9
Table cell headers attributes must refer to other <th> elements in the same table4axe td-headers-attr · Alfa sia-r45 · ACT a25f45
ARIA commands must have an accessible name3axe aria-command-name · Alfa sia-r12 · ACT 97a4e1