Kilotest: Diagnoses of heading level skipped violation by HTML element 454 on Mozilla Foundation join us page

Basics

About the page

• URL: https://www.mozillafoundation.org/en/join-us/
• Tested 3 days ago on 2026-10-07 at 21:54 by job 261007T2132-l0b
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 1762
  • Violators: 211
  • Issues: 46
• Download the full technical report (JSON)

About the issue

• Why it matters: Helper misdescribes the page
• Priority: low
• Related WCAG standard: 1.3.1
• Reported by 4 rule engines (Alfa + Axe + Html Checker + Pour)
• Violations: 4
• Violators: 3

About the violator

• Tag name: H4
• Text: Thank you!
• Start tag: <h4 class="newsletter-signup__success-title">
• XPath: [not obtained]
• Bounding box: [not obtained]
• Reported by Html Checker

Diagnoses

Here is how rule engines diagnose the heading level skipped issue for HTML element 454 of the Mozilla Foundation join us page.

1. The heading h4 (with computed level 4) follows the heading h1 (with computed level 1), skipping 2 heading levels.

   Rule engine: Html Checker (World Wide Web Consortium)