vital-scans open quality ledger

www.cdc.gov: Accessibility — week 2026-W25

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 2.5.5 631 1
1.4.6 WCAG 1.4.6 538 1
1.4.3 Contrast (Minimum) 511 2
1.4.8 WCAG 1.4.8 420 4
1.1.1 Non-text Content (images, icons) 417 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 ~272 finding(s) on 272 page(s).
XPath / selector: html
<html>
 Serious 272 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 ~134 finding(s) on 134 page(s).
XPath / selector: <html>
 Moderate 134 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 ~76 finding(s) on 76 page(s).
XPath / selector: .smallfield
<input class="smallfield" type="text" name="email" size="15" title="Insertar e-mail" value="Insertar e-mail" onfocus="this.value=''">
 Serious 76 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 ~287 finding(s) on 287 page(s).
XPath / selector: html
<html>
 Moderate 287 Requires manual testing. Each page should have exactly one <main> landmark. pages (CSV)
Page should contain a level-one heading · unattributed component
Fix one place, resolve ~85 finding(s) on 85 page(s).
XPath / selector: html
<html lang="en-us" class="cdc-theme-cdc cdc-page-type--home" style="--mobile-header-offset: 0px;">
 Moderate 85 Requires manual testing. See remediation guidance: https://dequeuniversity.com/rules/axe/4.12/page-has-heading-one?application=axeAPI pages (CSV)
Landmarks should have a unique role or role/label/title (i.e. accessible name) c · unattributed component
Fix one place, resolve ~525 finding(s) on 525 page(s).
XPath / selector: .page-right-rail__static
<aside class="page-right-rail__static noindex" role="complementary" style="margin-top: 92px;">
 Moderate 525 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)
Obsolete <big> element (use CSS) · unattributed component
Fix one place, resolve ~89 finding(s) on 62 page(s).
XPath / selector: big
<big><strong>Note:</strong></big>
 Moderate 62 Requires manual testing. Not captured by automated scan — requires manual testing. pages (CSV)
aria attribute is permitted for element role · unattributed component
Fix one place, resolve ~283 finding(s) on 283 page(s).
XPath / selector: @aria-label="Official website of the United States government"
 Moderate 283 Requires manual testing. Only use ARIA states/properties that are allowed on this element/role. pages (CSV)
Obsolete <font> element (use CSS) · unattributed component
Fix one place, resolve ~232 finding(s) on 80 page(s).
XPath / selector: font
<font size="3" face="Arial, Helvetica, Verdana" color="#FFFFFF"><i><b>Weekly</b></i></font>
 Moderate 80 Requires manual testing. Not captured by automated scan — requires manual testing. pages (CSV)
No obsolete or deprecated elements are used · unattributed component
Fix one place, resolve ~91 finding(s) on 91 page(s).
XPath / selector: {"type":"document","children":[{"type":"element","children":[{"type":"element","
 Moderate 91 Requires manual testing. See remediation guidance: https://alfa.siteimprove.com/rules/sia-r70 pages (CSV)

Bug reports

30 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: 32 WCAG 2.0 A, 2 WCAG 2.0 AA, 1 WCAG 2.1 A, 1 WCAG 2.2 AA, 6 WCAG 2.x AAA, 13 Best Practice, 19 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.

7 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 · 453 instances Likely template
Bug ID
VS-78ab118f
Pattern ID
VS-be8d563e
Combined ID
VS-78ab118f (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
a[name="content_area"] > font[color="red"]
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<font color="red">Persons using assistive technology might not be able to fully access information in this file. For assistance, please send e-mail to: </font>

Description

Elements must meet minimum color contrast ratio thresholds. Detected by axe-core rule color-contrast on 286 of 1667 scanned pages (453 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00026201.htm.
  2. Locate the element: a[name="content_area"] > font[color="red"]
  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) 281/1667 pages · 3365 instances Likely template
Bug ID
VS-7787596c
Pattern ID
VS-9074b4dd
Combined ID
VS-7787596c (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
td[rowspan="2"][width="10"]:nth-child(1) > img[alt=" "][width="10"][src$="spacer.gif"]
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<img src="../../images/spacer.gif" width="10" height="1" alt=" " border="0">

Description

Images must have alternative text. Detected by axe-core rule image-alt on 281 of 1667 scanned pages (3365 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00026201.htm.
  2. Locate the element: td[rowspan="2"][width="10"]:nth-child(1) > img[alt=" "][width="10"][src$="spacer.gif"]
  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 281 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) 272/1667 pages · 272 instances Likely template
Bug ID
VS-f37fdf14
Pattern ID
VS-c126b6a6
Combined ID
VS-f37fdf14 (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-W25 (2 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 272 of 1667 scanned pages (272 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00026201.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 272 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) 107/1667 pages · 204 instances Likely template
Bug ID
VS-3787474c
Pattern ID
VS-e9fe47ac
Combined ID
VS-3787474c (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-W25 (2 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 107 of 1667 scanned pages (204 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2005/jul/cover.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 107 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) 82/1667 pages · 337 instances Likely template
Bug ID
VS-507c5861
Pattern ID
VS-fafffee0
Combined ID
VS-507c5861 (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-W25 (2 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 82 of 1667 scanned pages (337 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5941md.htm?s_cid=mm5941md_w.
  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 82 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 link-in-text-block WCAG 2.0 A Links must be distinguishable without relying on color (WCAG 1.4.1) 24/1667 pages · 38 instances Likely template
Bug ID
VS-6cb92e1d
Pattern ID
VS-8ade3360
Combined ID
VS-6cb92e1d (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-W25 (2 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 24 of 1667 scanned pages (38 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.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 list WCAG 2.0 A <ul> and <ol> must only directly contain <li>, <script> or <template> elements (WCAG 1.3.1) 19/1667 pages · 26 instances Likely template
Bug ID
VS-fb60616a
Pattern ID
VS-a0bdbdf6
Combined ID
VS-fb60616a (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[type="1"]:nth-child(36)
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<ol type="1">

Description

<ul> and <ol> must only directly contain <li>, <script> or <template> elements. Detected by axe-core rule list on 19 of 1667 scanned pages (26 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00023705.htm.
  2. Locate the element: ol[type="1"]:nth-child(36)
  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 frame-title WCAG 2.0 A Frames must have an accessible name (WCAG 4.1.2) 16/1667 pages · 19 instances Likely template
Bug ID
VS-3cd353b6
Pattern ID
VS-3f76c7ea
Combined ID
VS-3cd353b6 (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-W25 (2 wk)

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

<iframe src="//www.youtube-nocookie.com/embed/stpS6515WGo?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 16 of 1667 scanned pages (19 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/stop-overdose/caring/fentanyl-facts.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

Critical axe select-name WCAG 2.0 A Select element must have an accessible name (WCAG 4.1.2) 9/1667 pages · 24 instances
Bug ID
VS-61fdbd1e
Pattern ID
VS-fab92378
Combined ID
VS-61fdbd1e (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-W25 (1 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 9 of 1667 scanned pages (24 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/tobacco/campaign/tips/spanish/dejar-fumar/medicamentos/como-usar-medicamentos/chicle-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 nested-interactive WCAG 2.0 A Interactive controls must not be nested (WCAG 4.1.2) 7/1667 pages · 11 instances
Bug ID
VS-3023e0e4
Pattern ID
VS-58301a87
Combined ID
VS-3023e0e4 (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-W25 (2 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 7 of 1667 scanned pages (11 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/tobacco/campaign/tips/diseases/secondhand-smoke-asthma.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 listitem WCAG 2.0 A <li> elements must be contained in a <ul> or <ol> (WCAG 1.3.1) 6/1667 pages · 42 instances
Bug ID
VS-0c719151
Pattern ID
VS-6175596b
Combined ID
VS-0c719151 (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
.syndicate:nth-child(4) > li:nth-child(28)
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<li>

Description

<li> elements must be contained in a <ul> or <ol>. Detected by axe-core rule listitem on 6 of 1667 scanned pages (42 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/niosh/ocas/hanford.html.
  2. Locate the element: .syndicate:nth-child(4) > li:nth-child(28)
  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) 3/1667 pages · 32 instances
Bug ID
VS-5dfb768e
Pattern ID
VS-5c82bd60
Combined ID
VS-5dfb768e (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
.horizontal > thead > tr > th:nth-child(1) > .sort-icon[role="button"]
History
first seen 2026-W24, last seen 2026-W25 (2 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 3 of 1667 scanned pages (32 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mumps/outbreaks/index.html.
  2. Locate the element: .horizontal > 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

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) 3/1667 pages · 12 instances
Bug ID
VS-a146ea15
Pattern ID
VS-07ba3b17
Combined ID
VS-a146ea15 (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
.table-responsive:nth-child(2) > div > table
History
first seen 2026-W25, last seen 2026-W25 (1 wk)

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

<table class="table table-bordered table-striped">

Description

Table cell headers attributes must refer to other <th> elements in the same tabl. Detected by axe-core rule td-headers-attr on 3 of 1667 scanned pages (12 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/food-poisoning-from-marine-toxins.html.
  2. Locate the element: .table-responsive:nth-child(2) > div > table
  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

Serious axe scrollable-region-focusable WCAG 2.0 A Scrollable region must have keyboard access (WCAG 2.1.1) 3/1667 pages · 4 instances
Bug ID
VS-dc1eba5a
Pattern ID
VS-c613c153
Combined ID
VS-dc1eba5a (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
.cdc_page_element.dfe-block--cdcmodule.dfe-block--width-standard:nth-child(5) > .dfe-block__inner > .cdc-textblock > div
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<div style="overflow-x: auto;">

Description

Scrollable region must have keyboard access. Detected by axe-core rule scrollable-region-focusable on 3 of 1667 scanned pages (4 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/fluview/surveillance/2026-week-08.html.
  2. Locate the element: .cdc_page_element.dfe-block--cdcmodule.dfe-block--width-standard:nth-child(5) > .dfe-block__inner > .cdc-textblock > div
  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

Critical axe aria-allowed-attr WCAG 2.0 A Elements must only use supported ARIA attributes (WCAG 4.1.2) 1/1667 pages · 15 instances Likely content
Bug ID
VS-673c26dc
Pattern ID
VS-1467ea8a
Combined ID
VS-673c26dc (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-W25 (1 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 1 of 1667 scanned pages (15 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/nchs/data-visualization/index.htm.
  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-roles WCAG 2.0 A ARIA roles used must conform to valid values (WCAG 4.1.2) 1/1667 pages · 5 instances Likely content
Bug ID
VS-1c0afcbe
Pattern ID
VS-5178ae33
Combined ID
VS-1c0afcbe (pattern VS-5178ae33) — 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
app-intro-page-heatrisk-intro
History
first seen 2026-W25, last seen 2026-W25 (1 wk)

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

<app-intro-page-heatrisk-intro _nghost-ng-c4116664259="" class="section moduleZone ng-star-inserted" role="section">

Description

ARIA roles used must conform to valid values. Detected by axe-core rule aria-roles on 1 of 1667 scanned pages (5 instances).

Steps to reproduce

  1. Open http://www.cdc.gov/heatrisk.
  2. Locate the element: app-intro-page-heatrisk-intro
  3. Confirm the axe-core finding for rule aria-roles 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: Use a valid ARIA role; check spelling and that it's a real role from the ARIA spec.

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

Critical axe aria-required-children WCAG 2.0 A Certain ARIA roles must contain particular children (WCAG 1.3.1) 1/1667 pages · 2 instances Likely content
Bug ID
VS-14ef4926
Pattern ID
VS-9429bb8d
Combined ID
VS-14ef4926 (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
div[role="tablist"]:nth-child(1)
History
first seen 2026-W25, last seen 2026-W25 (1 wk)

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

<div id="accord" role="tablist">

Description

Certain ARIA roles must contain particular children. Detected by axe-core rule aria-required-children on 1 of 1667 scanned pages (2 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/dpdx/diagnosticProcedures/stool/morphcomp.html.
  2. Locate the element: div[role="tablist"]:nth-child(1)
  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 aria-input-field-name WCAG 2.0 A ARIA input fields must have an accessible name (WCAG 4.1.2) 1/1667 pages · 2 instances Likely content
Bug ID
VS-f2832fde
Pattern ID
VS-0841abc2
Combined ID
VS-f2832fde (pattern VS-0841abc2) — 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
.rc-slider-handle-1
History
first seen 2026-W25, last seen 2026-W25 (1 wk)

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

<div tabindex="0" class="rc-slider-handle rc-slider-handle-1" role="slider" aria-valuemin="1" aria-valuemax="87" aria-valuenow="49" aria-disabled="false" style="left: 55.814%; right: auto; transform:

Description

ARIA input fields must have an accessible name. Detected by axe-core rule aria-input-field-name on 1 of 1667 scanned pages (2 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/overdose-prevention/data-research/facts-stats/dose-dashboard-nonfatal-surveillance-data.html.
  2. Locate the element: .rc-slider-handle-1
  3. Confirm the axe-core finding for rule aria-input-field-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

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

Serious axe blink WCAG 2.0 A <blink> elements are deprecated and must not be used (WCAG 2.2.2) 1/1667 pages · 1 instances Likely content
Bug ID
VS-f6146b68
Pattern ID
VS-4b45acfe
Combined ID
VS-f6146b68 (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-W25 (1 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 1 of 1667 scanned pages (1 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/rr5604a1.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

Serious axe document-title WCAG 2.0 A Documents must have <title> element to aid in navigation (WCAG 2.4.2) 1/1667 pages · 1 instances Likely content
Bug ID
VS-0f0dcadf
Pattern ID
VS-c80d5faa
Combined ID
VS-0f0dcadf (pattern VS-c80d5faa) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
WCAG 2.0 A
Obligation
required
Handling
review
WCAG SC
2.4.2 Page Titled (Level A, WCAG 2.0)
XPath / selector
#js
History
first seen 2026-W25, last seen 2026-W25 (1 wk)

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

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" id="js">

Description

Documents must have <title> element to aid in navigation. Detected by axe-core rule document-title on 1 of 1667 scanned pages (1 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5906a2.htm.
  2. Locate the element: #js
  3. Confirm the axe-core finding for rule document-title against WCAG 2.4.2 Page Titled.

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: Give the page a unique, descriptive <title>.

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

Serious axe region Best Practice All page content should be contained by landmarks (WCAG criterion undetermined) 1566/1667 pages · 11558 instances Likely template
Bug ID
VS-44ccbd9e
Pattern ID
VS-f18df681
Combined ID
VS-44ccbd9e (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
.cdc-site-gov-notice
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<div class="cdc-site-gov-notice noindex noprint" aria-label="Official website of the United States government">

Description

All page content should be contained by landmarks. Detected by axe-core rule region on 1566 of 1667 scanned pages (11558 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html.
  2. Locate the element: .cdc-site-gov-notice
  3. Confirm the axe-core finding for rule region.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 1566 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) 76/1667 pages · 76 instances Likely template
Bug ID
VS-c8429280
Pattern ID
VS-33841929
Combined ID
VS-c8429280 (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-W25 (2 wk)

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

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

Description

Form elements should have a visible label. Detected by axe-core rule label-title-only on 76 of 1667 scanned pages (76 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2009/jan/07_0262_es.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 76 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) 243/1667 pages · 2646 instances Likely template
Bug ID
VS-5535f378
Pattern ID
VS-179ad9b3
Combined ID
VS-5535f378 (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="#content_area">
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Target size is at least 24×24 CSS pixels or has spacing (Minimum). Detected by Siteimprove Alfa rule sia-r113 on 243 of 1667 scanned pages (2646 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00000686.htm.
  2. Locate the element: <a href="#content_area">
  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 243 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) 225/1667 pages · 1267 instances · possible duplicate Likely template
Bug ID
VS-80f8e418
Pattern ID
VS-f7e99f4b
Combined ID
VS-80f8e418 (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: "Related Pages"
History
first seen 2026-W24, last seen 2026-W25 (2 wk)
Possible duplicate
Same WCAG SC covered by axe report VS-78ab118f (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 225 of 1667 scanned pages (1267 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/monkeypox/signs-symptoms/index.html.
  2. Locate the element: text: "Related Pages"
  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 225 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 · 1609 instances Likely template
Bug ID
VS-2945f2b0
Pattern ID
VS-a24eaa8c
Combined ID
VS-2945f2b0 (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="../../images/spacer.gif" width="10" height="1" alt=" ">
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Image has accessible name. Detected by Siteimprove Alfa rule sia-r2 on 136 of 1667 scanned pages (1609 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00000686.htm.
  2. Locate the element: <img src="../../images/spacer.gif" width="10" height="1" alt=" ">
  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) 134/1667 pages · 134 instances Likely template
Bug ID
VS-3320462d
Pattern ID
VS-7a0e5645
Combined ID
VS-3320462d (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-W25 (2 wk)

Description

Document has a valid lang attribute. Detected by Siteimprove Alfa rule sia-r4 on 134 of 1667 scanned pages (134 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00000686.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 134 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) 87/1667 pages · 1269 instances Likely template
Bug ID
VS-0a0bd9c0
Pattern ID
VS-d6097011
Combined ID
VS-0a0bd9c0 (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-W25 (2 wk)

Description

Presentational children of an element are not focusable. Detected by Siteimprove Alfa rule sia-r68 on 87 of 1667 scanned pages (1269 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/trichomoniasis/about/index.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 87 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) 67/1667 pages · 146 instances Likely template
Bug ID
VS-f437bf53
Pattern ID
VS-f7dba940
Combined ID
VS-f437bf53 (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 aria-label="View" target="_blank" class="cdc-block-link" href="/steadi/media/pdfs/STEADI-Algorithm-508.pdf">
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Accessible name of link or button matches visible label. Detected by Siteimprove Alfa rule sia-r14 on 67 of 1667 scanned pages (146 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/steadi/hcp/clinical-resources/index.html.
  2. Locate the element: <a aria-label="View" target="_blank" class="cdc-block-link" href="/steadi/media/pdfs/STEADI-Algorithm-508.pdf">
  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 67 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) 45/1667 pages · 89 instances Likely template
Bug ID
VS-2960879b
Pattern ID
VS-28ebd979
Combined ID
VS-2960879b (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-W25 (2 wk)

Description

Link has accessible name. Detected by Siteimprove Alfa rule sia-r11 on 45 of 1667 scanned pages (89 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2009/jan/07_0262_es.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 45 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 · 66 instances Likely template
Bug ID
VS-1816a0ac
Pattern ID
VS-a48e6078
Combined ID
VS-1816a0ac (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-W25 (2 wk)

Description

Form field has accessible name. Detected by Siteimprove Alfa rule sia-r8 on 36 of 1667 scanned pages (66 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6010a7.htm?s_cid=mm6010a7_w.
  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-r111 WCAG 2.x AAA Target size is at least 44×44 CSS pixels (Enhanced) (WCAG 2.5.5) 631/1667 pages · 20479 instances Likely template
Bug ID
VS-9b1e1f35
Pattern ID
VS-cb53cc4d
Combined ID
VS-9b1e1f35 (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
<button class="btn btn-outline-white btn-arrow-down btn-fancy" id="megaButton">
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Target size is at least 44×44 CSS pixels (Enhanced). Detected by Siteimprove Alfa rule sia-r111 on 631 of 1667 scanned pages (20479 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html.
  2. Locate the element: <button class="btn btn-outline-white btn-arrow-down btn-fancy" id="megaButton">
  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 631 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) 538/1667 pages · 18185 instances Likely template
Bug ID
VS-2e06278f
Pattern ID
VS-646b1e0b
Combined ID
VS-2e06278f (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: " Here's how you know "
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Text has enhanced contrast. Detected by Siteimprove Alfa rule sia-r66 on 538 of 1667 scanned pages (18185 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html.
  2. Locate the element: text: " Here's how you know "
  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 538 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 axe heading-order Best Practice Heading levels should only increase by one (WCAG criterion undetermined) 533/1667 pages · 763 instances Likely template
Bug ID
VS-c564af31
Pattern ID
VS-d25f622d
Combined ID
VS-c564af31 (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:nth-child(5)
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<h3><a id="sec" class="onThisPageAnchor" title="Special Exposure Cohort" name="sec"></a> Special Exposure Cohort Petition Information</h3>

Description

Heading levels should only increase by one. Detected by axe-core rule heading-order on 533 of 1667 scanned pages (763 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/niosh/ocas/sandialmore.html.
  2. Locate the element: h3:nth-child(5)
  3. Confirm the axe-core finding for rule heading-order.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 533 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) 528/1667 pages · 533 instances Likely template
Bug ID
VS-8c2d08cb
Pattern ID
VS-8806389c
Combined ID
VS-8c2d08cb (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-W25 (2 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: 92px;">

Description

Landmarks should have a unique role or role/label/title (i.e. accessible name) c. Detected by axe-core rule landmark-unique on 528 of 1667 scanned pages (533 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html.
  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 528 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-r57 Undetermined Scrolling content can be accessed by keyboard (WCAG criterion undetermined) 467/1667 pages · 7222 instances Likely template
Bug ID
VS-3ff2aeff
Pattern ID
VS-c18be945
Combined ID
VS-3ff2aeff (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-W25 (2 wk)

Description

Scrolling content can be accessed by keyboard. Detected by Siteimprove Alfa rule sia-r57 on 467 of 1667 scanned pages (7222 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.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 467 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 landmark-one-main Best Practice Document should have one main landmark (WCAG criterion undetermined) 361/1667 pages · 361 instances Likely template
Bug ID
VS-68587385
Pattern ID
VS-d5d82446
Combined ID
VS-68587385 (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-W25 (2 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 361 of 1667 scanned pages (361 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00026201.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 361 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-r18 Undetermined aria attribute is permitted for element role (WCAG criterion undetermined) 311/1667 pages · 334 instances Likely template
Bug ID
VS-7fc23d96
Pattern ID
VS-e05344b9
Combined ID
VS-7fc23d96 (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-W25 (2 wk)

Description

aria attribute is permitted for element role. Detected by Siteimprove Alfa rule sia-r18 on 311 of 1667 scanned pages (334 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.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 311 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 alfa sia-r53 Undetermined Headings are structured hierarchically (WCAG criterion undetermined) 235/1667 pages · 340 instances Likely template
Bug ID
VS-6808c929
Pattern ID
VS-f054f4a4
Combined ID
VS-6808c929 (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
<h4 id="heading-xi5lbpcyef">
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Headings are structured hierarchically. Detected by Siteimprove Alfa rule sia-r53 on 235 of 1667 scanned pages (340 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/steadi/hcp/clinical-resources/index.html.
  2. Locate the element: <h4 id="heading-xi5lbpcyef">
  3. Confirm the Siteimprove Alfa finding for rule sia-r53.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 235 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-r73 WCAG 2.x AAA Text has minimum contrast ratio of 4.5:1 (WCAG 1.4.8) 208/1667 pages · 61158 instances Likely template
Bug ID
VS-0392e3ed
Pattern ID
VS-2208081b
Combined ID
VS-0392e3ed (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>
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Text has minimum contrast ratio of 4.5:1. Detected by Siteimprove Alfa rule sia-r73 on 208 of 1667 scanned pages (61158 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00000686.htm.
  2. Locate the element: <p>
  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 208 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-r74 WCAG 2.x AAA Link is distinguishable without relying on color (WCAG 1.4.8) 206/1667 pages · 37544 instances Likely template
Bug ID
VS-3a515fe1
Pattern ID
VS-fbf54eba
Combined ID
VS-3a515fe1 (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 style="font-family: Arial, Helvetica, sans-serif; font-size: 8pt; color: #333333;">
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Link is distinguishable without relying on color. Detected by Siteimprove Alfa rule sia-r74 on 206 of 1667 scanned pages (37544 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00000686.htm.
  2. Locate the element: <p style="font-family: Arial, Helvetica, sans-serif; font-size: 8pt; color: #333333;">
  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 206 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-r70 Undetermined No obsolete or deprecated elements are used (WCAG criterion undetermined) 163/1667 pages · 163 instances Likely template
Bug ID
VS-789d6f54
Pattern ID
VS-3d033717
Combined ID
VS-789d6f54 (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":"element","children":[{"type":"element","
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

No obsolete or deprecated elements are used. Detected by Siteimprove Alfa rule sia-r70 on 163 of 1667 scanned pages (163 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00000686.htm.
  2. Locate the element: {"type":"document","children":[{"type":"element","children":[{"type":"element","
  3. Confirm the Siteimprove Alfa finding for rule sia-r70.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 163 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 deprecated-html presentational-attr Undetermined Presentational attribute (use CSS) (WCAG criterion undetermined) 151/1667 pages · 42730 instances Likely template
Bug ID
VS-88fec58a
Pattern ID
VS-04a9d28c
Combined ID
VS-88fec58a (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-W25 (2 wk)

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

<th class="row1left" scope="col" align="left" valign="bottom">Characteristic</th>

Description

Presentational attribute (use CSS). Detected by deprecated-html rule presentational-attr on 151 of 1667 scanned pages (42730 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/volumes/71/wr/mm7134a2.htm?s_cid=mm7134a2_w.
  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 151 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.

Moderate deprecated-html font-element Undetermined Obsolete <font> element (use CSS) (WCAG criterion undetermined) 99/1667 pages · 822 instances Likely template
Bug ID
VS-d08cec46
Pattern ID
VS-91d2294a
Combined ID
VS-d08cec46 (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-W25 (2 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 99 of 1667 scanned pages (822 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00025213.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

…and more — all 99 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.

Moderate axe page-has-heading-one Best Practice Page should contain a level-one heading (WCAG criterion undetermined) 85/1667 pages · 85 instances Likely template
Bug ID
VS-eb968dcc
Pattern ID
VS-fa44f293
Combined ID
VS-eb968dcc (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-W25 (2 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--home" style="--mobile-header-offset: 0px;">

Description

Page should contain a level-one heading. Detected by axe-core rule page-has-heading-one on 85 of 1667 scanned pages (85 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/flu/avianflu/index.htm.
  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 85 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 deprecated-html big-element Undetermined Obsolete <big> element (use CSS) (WCAG criterion undetermined) 62/1667 pages · 99 instances Likely template
Bug ID
VS-f6582ccb
Pattern ID
VS-7845739d
Combined ID
VS-f6582ccb (pattern VS-7845739d) — 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 <big> element (use CSS) [big-element]
XPath / selector
big
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<big><strong>Note:</strong></big>

Description

Obsolete <big> element (use CSS). Detected by deprecated-html rule big-element on 62 of 1667 scanned pages (99 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00025213.htm.
  2. Locate the element: big
  3. Confirm the deprecated-html finding for rule big-element.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 62 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.

Moderate alfa sia-r61 Undetermined Form field label is visible (WCAG criterion undetermined) 55/1667 pages · 55 instances Likely template
Bug ID
VS-551b35ea
Pattern ID
VS-7118fead
Combined ID
VS-551b35ea (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":null,"sys
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Form field label is visible. Detected by Siteimprove Alfa rule sia-r61 on 55 of 1667 scanned pages (55 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/flu/avianflu/index.htm.
  2. Locate the element: {"type":"document","children":[{"type":"type","name":"html","publicId":null,"sys
  3. Confirm the Siteimprove Alfa finding for rule sia-r61.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 55 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 alfa sia-r78 Undetermined Table header has scope (WCAG criterion undetermined) 29/1667 pages · 34 instances Likely template
Bug ID
VS-eadf83a7
Pattern ID
VS-2cd767ca
Combined ID
VS-eadf83a7 (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
<h3 id="heading-1hasrslxsq">
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Table header has scope. Detected by Siteimprove Alfa rule sia-r78 on 29 of 1667 scanned pages (34 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/west-nile-virus/signs-symptoms/index.html.
  2. Locate the element: <h3 id="heading-1hasrslxsq">
  3. Confirm the Siteimprove Alfa finding for rule sia-r78.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 29 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

Minor axe empty-table-header Best Practice Table header text should not be empty (WCAG criterion undetermined) 28/1667 pages · 143 instances Likely template
Bug ID
VS-c8c39ad2
Pattern ID
VS-d69fc059
Combined ID
VS-c8c39ad2 (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
.story:nth-child(18) > table > tbody > tr:nth-child(2) > .col-head:nth-child(1)
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<th class="col-head" scope="col">
							</th>

Description

Table header text should not be empty. Detected by axe-core rule empty-table-header on 28 of 1667 scanned pages (143 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5941md.htm?s_cid=mm5941md_w.
  2. Locate the element: .story:nth-child(18) > table > tbody > tr:nth-child(2) > .col-head:nth-child(1)
  3. Confirm the axe-core finding for rule empty-table-header.

Impact

Not captured by automated scan — requires manual testing.

Affected pages

…and more — all 28 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/empty-table-header?application=axeAPI

Moderate deprecated-html center-element Undetermined Obsolete <center> element (use CSS) (WCAG criterion undetermined) 25/1667 pages · 51 instances Likely template
Bug ID
VS-11430bcc
Pattern ID
VS-20060f39
Combined ID
VS-11430bcc (pattern VS-20060f39) — 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 <center> element (use CSS) [center-element]
XPath / selector
center
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

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

<center>
  <table border="0" width="140" cellspacing="0" cellpadding="0">
    
    <tbody><tr>
      <td width="140" bgcolor="#8A9683"><img border="0" src="www.cdc.gov/navimages/spacer.gif" width="140

Description

Obsolete <center> element (use CSS). Detected by deprecated-html rule center-element on 25 of 1667 scanned pages (51 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/pcd/issues/2010/sep/cover.htm.
  2. Locate the element: center
  3. Confirm the deprecated-html finding for rule center-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 alfa sia-r79 Undetermined Duplicate role landmark is labeled (WCAG criterion undetermined) 22/1667 pages · 49 instances Likely template
Bug ID
VS-0a66aa81
Pattern ID
VS-f2542d87
Combined ID
VS-0a66aa81 (pattern VS-f2542d87) — use this format in JIRA/spreadsheets to filter by instance or pattern
WCAG category
Undetermined
Obligation
unmapped
Handling
review
WCAG SC
undetermined
XPath / selector
<pre>
History
first seen 2026-W24, last seen 2026-W25 (2 wk)

Description

Duplicate role landmark is labeled. Detected by Siteimprove Alfa rule sia-r79 on 22 of 1667 scanned pages (49 instances).

Steps to reproduce

  1. Open https://www.cdc.gov/mmwr/preview/mmwrhtml/00023705.htm.
  2. Locate the element: <pre>
  3. Confirm the Siteimprove Alfa finding for rule sia-r79.

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-r79

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
Moderate scope attribute should be used correctly (WCAG criterion undetermined) [scope-attr-valid] Best Practice 8
Minor Headings should not be empty (WCAG criterion undetermined) [empty-heading] Best Practice 8
Moderate Tables are used for tabular data, not layout (WCAG criterion undetermined) [sia-r40] Undetermined 6
Moderate Scrollable element is keyboard accessible (WCAG 1.4.8) [sia-r80] WCAG 2.x AAA 5
Moderate Link in text block is visually distinguishable without color (WCAG 1.4.1) [sia-r62] WCAG 2.0 A 5
Moderate Input purpose can be determined (WCAG criterion undetermined) [sia-r60] Undetermined 5
Moderate Table cell has header (WCAG 1.3.1) [sia-r77] WCAG 2.0 A 3
Moderate Element has required aria-owns (WCAG 1.3.1) [sia-r46] WCAG 2.0 A 3
Moderate Component with same name serves same purpose (WCAG 4.1.2) [sia-r90] WCAG 2.0 A 3
Moderate Keyboard trap does not exist (WCAG criterion undetermined) [sia-r85] Undetermined 3
Minor ARIA role should be appropriate for the element (WCAG criterion undetermined) [aria-allowed-role] Best Practice 3
Moderate aria-hidden element is not exposed to assistive technology (WCAG 1.3.1) [sia-r45] WCAG 2.0 A 2
Moderate Element has required owned roles (WCAG 1.3.1) [sia-r64] WCAG 2.0 A 2
Moderate The skip-link target should exist and be focusable (WCAG criterion undetermined) [skip-link] Best Practice 2
Minor Tables should not have the same summary and caption (WCAG criterion undetermined) [table-duplicate-name] Best Practice 2
Moderate Button has accessible name (WCAG 4.1.2) [sia-r12] WCAG 2.0 A 1
Moderate Form field error is identified and described (WCAG criterion undetermined) [sia-r75] Undetermined 1
Moderate Assertive live region is marked as atomic (WCAG criterion undetermined) [sia-r54] Undetermined 1
Moderate Document has a title element (WCAG 2.4.2) [sia-r1] WCAG 2.0 A 1
Moderate Element with orientation is not locked (WCAG criterion undetermined) [sia-r59] Undetermined 1
Moderate First focusable element is link to main content (WCAG criterion undetermined) [sia-r87] Undetermined 1
Moderate iframe element is not empty (WCAG 1.4.8) [sia-r71] WCAG 2.x AAA 1
Moderate Obsolete <blink> element (WCAG criterion undetermined) [blink-element] Undetermined 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-W25, by pages affected
RuleImpactPages affectedInstancesExample pagesAll affected
All page content should be contained by landmarks [region] moderate 1566 11558 /disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html
/niosh/ocas/sandialmore.html
/mmwr/preview/mmwrhtml/00026201.htm		 all 1566 pages (CSV)
Heading levels should only increase by one [heading-order] moderate 533 763 /niosh/ocas/sandialmore.html
/mmwr/preview/mmwrhtml/00026201.htm
/mmwr/volumes/73/wr/mm7316a6.htm		 all 533 pages (CSV)
Landmarks should have a unique role or role/label/title (i.e. accessible name) combination [landmark-unique] moderate 528 533 /disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html
/listeria/causes/fruits-vegetables.html
/nchs/updates		 all 528 pages (CSV)
Document should have one main landmark [landmark-one-main] moderate 361 361 /mmwr/preview/mmwrhtml/00026201.htm
/mmwr/preview/mmwrhtml/mm5941md.htm
/pcd/issues/2005/jul/cover.htm		 all 361 pages (CSV)
Elements must meet minimum color contrast ratio thresholds [color-contrast] serious 286 453 /mmwr/preview/mmwrhtml/00026201.htm
/mmwr/preview/mmwrhtml/mm5941md.htm
/mmwr/preview/mmwrhtml/00000686.htm		 all 286 pages (CSV)
Images must have alternative text [image-alt] critical 281 3365 /mmwr/preview/mmwrhtml/00026201.htm
/pcd/issues/2005/jul/cover.htm
/pcd/issues/2006/oct/memoriam.htm		 all 281 pages (CSV)
<html> element must have a lang attribute [html-has-lang] serious 272 272 /mmwr/preview/mmwrhtml/00026201.htm
/pcd/issues/2005/jul/cover.htm
/pcd/issues/2006/oct/memoriam.htm		 all 272 pages (CSV)
Links must have discernible text [link-name] serious 107 204 /pcd/issues/2005/jul/cover.htm
/pcd/issues/2006/oct/memoriam.htm
/pcd/issues/2009/jan/07_0262_es.htm		 all 107 pages (CSV)
Page should contain a level-one heading [page-has-heading-one] moderate 85 85 /flu/avianflu/index.htm
/traumatic-brain-injury/site.html
/aging-programs		 all 85 pages (CSV)
Form elements must have labels [label] critical 82 337 /mmwr/preview/mmwrhtml/mm5941md.htm
/mmwr/preview/mmwrhtml/mm6010a7.htm
/mmwr/preview/mmwrhtml/mm5950a3.htm		 all 82 pages (CSV)
Form elements should have a visible label [label-title-only] serious 76 76 /pcd/issues/2009/jan/07_0262_es.htm
/pcd/issues/2009/jan/07_0192.htm
/pcd/issues/2011/nov/10_0191_es.htm		 all 76 pages (CSV)
Table header text should not be empty [empty-table-header] minor 28 143 /mmwr/preview/mmwrhtml/mm5941md.htm
/mumps/php/public-health-strategy/index.html
/mmwr/preview/mmwrhtml/mm5924a2.htm		 all 28 pages (CSV)
Links must be distinguishable without relying on color [link-in-text-block] serious 24 38 /disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html
/infection-control/hcp/healthcare-personnel-epidemiology-control/pregnant-hcp.html
/spanish/niosh/docs/2007-150_sp/default.html		 all 24 pages (CSV)
<ul> and <ol> must only directly contain <li>, <script> or <template> elements [list] serious 19 26 /mmwr/preview/mmwrhtml/00023705.htm
/bird-flu/php/surveillance/h5n1-human-infections.html
/fluview/surveillance/2026-week-08.html		 all 19 pages (CSV)
Frames must have an accessible name [frame-title] serious 16 19 /stop-overdose/caring/fentanyl-facts.html
/vaccines/resources/protect-baby-from-getting-sick.html
/youth-violence/about/about-bullying.html		 all 16 pages (CSV)
Select element must have an accessible name [select-name] critical 9 24 /tobacco/campaign/tips/spanish/dejar-fumar/medicamentos/como-usar-medicamentos/chicle-de-nicotina.html
/dhds/about/index.html
/nchs/products/databriefs.htm		 all 9 pages (CSV)
scope attribute should be used correctly [scope-attr-valid] moderate 8 128 /mmwr/volumes/71/wr/mm7107e2.htm
/pcd/issues/2019/19_0163.htm
/tobacco/campaign/tips/spanish/acerca/Carga-del-consumo-de-tabaco-en-los-Estados-Unidos.html		 all 8 pages (CSV)
Headings should not be empty [empty-heading] minor 8 9 /mmwr/volumes/73/wr/mm7308a3.htm
/mmwr/preview/mmwrhtml/mm5125a1.htm
/mmwr/preview/mmwrhtml/mm5712a5.htm		 all 8 pages (CSV)
Interactive controls must not be nested [nested-interactive] serious 7 11 /tobacco/campaign/tips/diseases/secondhand-smoke-asthma.html
/tobacco/campaign/tips/spanish/acerca/Carga-del-consumo-de-tabaco-en-los-Estados-Unidos.html
/tobacco/campaign/tips/spanish/poblaciones/discapacidades.html		 all 7 pages (CSV)
<li> elements must be contained in a <ul> or <ol> [listitem] serious 6 42 /niosh/ocas/hanford.html
/phleads/php/about/index.html
/radiation-health/data-research/facts-stats/ct-scans.html		 all 6 pages (CSV)
ARIA commands must have an accessible name [aria-command-name] serious 3 32 /mumps/outbreaks/index.html
/breastfeeding-data/county-initiation/index.html
/heatrisk		 all 3 pages (CSV)
Table cell headers attributes must refer to other <th> elements in the same table [td-headers-attr] serious 3 12 /yellow-book/hcp/environmental-hazards-risks/food-poisoning-from-marine-toxins.html
/vaccines/hcp/imz-schedules/adult-age.html
/dpdx/diagnosticProcedures/stool/morphcomp.html		 all 3 pages (CSV)
ARIA role should be appropriate for the element [aria-allowed-role] minor 3 6 /vitalsigns/vaccines-for-children/index.html
/vitalsigns/global-hiv/index.html
/tb/php/laboratory/mddr-form/index.html		 all 3 pages (CSV)
Scrollable region must have keyboard access [scrollable-region-focusable] serious 3 4 /fluview/surveillance/2026-week-08.html
/flu/es/about/acerca-de-la-influenza.html
/yellow-book/hcp/refugees-immigrants-migrants/pre-arrival-medical-screening-and-interventions.html		 all 3 pages (CSV)
Tables should not have the same summary and caption [table-duplicate-name] minor 2 5 /nchs/data-visualization/index.htm
/nssp/php/onboarding-resources/implementation-guides.html		 all 2 pages (CSV)
The skip-link target should exist and be focusable [skip-link] moderate 2 2 /pcd/es/2014_toc.htm
/pcd/es/archive_es.htm		 all 2 pages (CSV)
Elements must only use supported ARIA attributes [aria-allowed-attr] critical 1 15 /nchs/data-visualization/index.htm all 1 pages (CSV)
Alternative text of images should not be repeated as text [image-redundant-alt] minor 1 6 /nchs/hus.htm all 1 pages (CSV)
ARIA roles used must conform to valid values [aria-roles] critical 1 5 /heatrisk all 1 pages (CSV)
ARIA input fields must have an accessible name [aria-input-field-name] serious 1 2 /overdose-prevention/data-research/facts-stats/dose-dashboard-nonfatal-surveillance-data.html all 1 pages (CSV)
Certain ARIA roles must contain particular children [aria-required-children] critical 1 2 /dpdx/diagnosticProcedures/stool/morphcomp.html all 1 pages (CSV)
Documents must have <title> element to aid in navigation [document-title] serious 1 1 /mmwr/preview/mmwrhtml/mm5906a2.htm all 1 pages (CSV)
<blink> elements are deprecated and must not be used [blink] serious 1 1 /mmwr/preview/mmwrhtml/rr5604a1.htm 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-W25, by pages affected
RuleImpactPages affectedInstancesExample pagesAll affected
Target size is at least 44×44 CSS pixels (Enhanced) [sia-r111] n/a 631 20479 /disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html
/flu/avianflu/index.htm
/steadi/hcp/clinical-resources/index.html		 all 631 pages (CSV)
Text has enhanced contrast [sia-r66] n/a 538 18185 /disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html
/flu/avianflu/index.htm
/steadi/hcp/clinical-resources/index.html		 all 538 pages (CSV)
Scrolling content can be accessed by keyboard [sia-r57] n/a 467 7222 /disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html
/flu/avianflu/index.htm
/steadi/hcp/clinical-resources/index.html		 all 467 pages (CSV)
aria attribute is permitted for element role [sia-r18] n/a 311 334 /disability-and-health-partners/php/healthy-communities/stories-about-reaching-people.html
/flu/avianflu/index.htm
/steadi/hcp/clinical-resources/index.html		 all 311 pages (CSV)
Target size is at least 24×24 CSS pixels or has spacing (Minimum) [sia-r113] n/a 243 2646 /mmwr/preview/mmwrhtml/00000686.htm
/monkeypox/signs-symptoms/index.html
/pcd/issues/2009/jan/07_0262_es.htm		 all 243 pages (CSV)
Headings are structured hierarchically [sia-r53] n/a 235 340 /steadi/hcp/clinical-resources/index.html
/mmwr/preview/mmwrhtml/00000686.htm
/pcd/issues/2009/jan/07_0262_es.htm		 all 235 pages (CSV)
Text has sufficient color contrast (Enhanced) [sia-r69] n/a 225 1267 /monkeypox/signs-symptoms/index.html
/group-a-strep/hcp/clinical-guidance/post-streptococcal-glomerulonephritis.html
/yellow-book/hcp/contents/index.html		 all 225 pages (CSV)
Text has minimum contrast ratio of 4.5:1 [sia-r73] n/a 208 61158 /mmwr/preview/mmwrhtml/00000686.htm
/pcd/issues/2009/jan/07_0262_es.htm
/pcd/issues/2009/jan/07_0192.htm		 all 208 pages (CSV)
Link is distinguishable without relying on color [sia-r74] n/a 206 37544 /mmwr/preview/mmwrhtml/00000686.htm
/pcd/issues/2009/jan/07_0262_es.htm
/pcd/issues/2009/jan/07_0192.htm		 all 206 pages (CSV)
No obsolete or deprecated elements are used [sia-r70] n/a 163 163 /mmwr/preview/mmwrhtml/00000686.htm
/pcd/issues/2009/jan/07_0262_es.htm
/pcd/issues/2009/jan/07_0192.htm		 all 163 pages (CSV)
Image has accessible name [sia-r2] n/a 136 1609 /mmwr/preview/mmwrhtml/00000686.htm
/pcd/issues/2009/jan/07_0262_es.htm
/pcd/issues/2009/jan/07_0192.htm		 all 136 pages (CSV)
Document has a valid lang attribute [sia-r4] n/a 134 134 /mmwr/preview/mmwrhtml/00000686.htm
/pcd/issues/2009/jan/07_0262_es.htm
/pcd/issues/2009/jan/07_0192.htm		 all 134 pages (CSV)
Presentational children of an element are not focusable [sia-r68] n/a 87 1269 /trichomoniasis/about/index.html
/tobacco-health-equity/collection/anhpi.html
/diabetes/es/about/acerca-de-la-cetoacidosis-diabetica.html		 all 87 pages (CSV)
Accessible name of link or button matches visible label [sia-r14] n/a 67 146 /steadi/hcp/clinical-resources/index.html
/nchhstp/whats-new/recruitment-director-2026.html
/global-water-sanitation-hygiene/es/about/global-drinking-water.html		 all 67 pages (CSV)
Form field label is visible [sia-r61] n/a 55 55 /flu/avianflu/index.htm
/mmwr/preview/mmwrhtml/mm6010a7.htm
/mmwr/preview/mmwrhtml/mm5924a2.htm		 all 55 pages (CSV)
Link has accessible name [sia-r11] n/a 45 89 /pcd/issues/2009/jan/07_0262_es.htm
/pcd/issues/2009/jan/07_0192.htm
/pcd/issues/2011/nov/11_0018_es.htm		 all 45 pages (CSV)
Form field has accessible name [sia-r8] n/a 36 66 /mmwr/preview/mmwrhtml/mm6010a7.htm
/mmwr/preview/mmwrhtml/mm5924a2.htm
/mmwr/preview/mmwrhtml/mm5921a3.htm		 all 36 pages (CSV)
Table header has scope [sia-r78] n/a 29 34 /west-nile-virus/signs-symptoms/index.html
/mmwr/volumes/66/wr/mm6603a7.htm
/hepatitis-surveillance-2023/hepatitis-c/index.html		 all 29 pages (CSV)
Duplicate role landmark is labeled [sia-r79] n/a 22 49 /mmwr/preview/mmwrhtml/00023705.htm
/mmwr/preview/mmwrhtml/00047030.htm
/mmwr/preview/mmwrhtml/00050819.htm		 all 22 pages (CSV)
Tables are used for tabular data, not layout [sia-r40] n/a 6 6 /monkeypox/signs-symptoms/index.html
/dhds/about/index.html
/bird-flu/h5-monitoring/index.html		 all 6 pages (CSV)
Scrollable element is keyboard accessible [sia-r80] n/a 5 256 /pcd/issues/2009/jan/toc.htm
/pcd/collections/Diabetes_Prevention.htm
/pcd/issues/gis_toc.htm		 all 5 pages (CSV)
Link in text block is visually distinguishable without color [sia-r62] n/a 5 20 /tobacco/campaign/tips/diseases/secondhand-smoke-asthma.html
/spanish/NIOSH/docs/2008-112_sp
/spanish/NIOSH/docs/wp-solutions/2013-104_sp		 all 5 pages (CSV)
Input purpose can be determined [sia-r60] n/a 5 11 /about/speakers/request-director.html
/mmwr/index2008.html
/tribal-health/data-research/datarequest.html		 all 5 pages (CSV)
Table cell has header [sia-r77] n/a 3 3109 /physical-activity/php/strategies/increasing-physical-activity-through-community-design-prevention-strategies.html
/fluview/surveillance/2026-week-08.html
/mmwr/preview/mmwrhtml/mm6008md.htm		 all 3 pages (CSV)
Element has required aria-owns [sia-r46] n/a 3 6 /vaccines/hcp/imz-schedules/child-adolescent-catch-up.html
/flu/whats-new/22-23-summary-technical-report.html
/vaccines/hcp/imz-schedules/adult-age.html		 all 3 pages (CSV)
Component with same name serves same purpose [sia-r90] n/a 3 3 /tobacco/campaign/tips/diseases/secondhand-smoke-asthma.html
/tobacco/campaign/tips/spanish/acerca/Carga-del-consumo-de-tabaco-en-los-Estados-Unidos.html
/tobacco/campaign/tips/spanish/poblaciones/personas-con-afecciones-mentales.html		 all 3 pages (CSV)
Keyboard trap does not exist [sia-r85] n/a 3 3 /han/2023/han00485.html
/han/2024/han00510.html
/overdose-prevention/data-research/facts-stats/clinical-drug-test-dashboard.html		 all 3 pages (CSV)
aria-hidden element is not exposed to assistive technology [sia-r45] n/a 2 19 /vaccines/hcp/imz-schedules/child-adolescent-catch-up.html
/vaccines/hcp/imz-schedules/adult-age.html		 all 2 pages (CSV)
Element has required owned roles [sia-r64] n/a 2 2 /nchs/products/databriefs/db453.htm
/niosh/idlh		 all 2 pages (CSV)
Button has accessible name [sia-r12] n/a 1 28 /mumps/outbreaks/index.html all 1 pages (CSV)
Form field error is identified and described [sia-r75] n/a 1 10 /mmwr/preview/mmwrhtml/mm5916a2_ensp.htm all 1 pages (CSV)
Document has a title element [sia-r1] n/a 1 1 /mmwr/preview/mmwrhtml/mm5906a2.htm all 1 pages (CSV)
iframe element is not empty [sia-r71] n/a 1 1 /pcd/issues/2009/jan/07_0022.htm all 1 pages (CSV)
Element with orientation is not locked [sia-r59] n/a 1 1 /flu/weekly/weeklyarchives2025-2026/data/whoAllregt_phl08.html all 1 pages (CSV)
First focusable element is link to main content [sia-r87] n/a 1 1 /flu/weekly/weeklyarchives2025-2026/data/whoAllregt_phl08.html all 1 pages (CSV)
Assertive live region is marked as atomic [sia-r54] n/a 1 1 /mumps/outbreaks/index.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 (8207 raw engine findings → 7849 unique).

Unique issues (rule × page)
7849
Caught by both engines
356 highest confidence
axe only
3967
Alfa only
3526
9 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-W25, by pages affected.
IssuePagesRule references
Elements must only use supported ARIA attributes311axe aria-allowed-attr · Alfa sia-r18 · ACT 5c01ea
Images must have alternative text281axe image-alt · Alfa sia-r2 · ACT 23a2a8
<html> element must have a lang attribute272axe html-has-lang · Alfa sia-r4 · ACT b5c3f8
Links must have discernible text107axe link-name · Alfa sia-r11 · ACT c487ae
Form elements must have labels91axe 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
Documents must have <title> element to aid in navigation1axe document-title · Alfa sia-r1 · ACT 2779a5