Kilotest: Diagnoses of hovering changes content violation by HTML element 199 on Mozilla Foundation page

Basics

About the page

• URL: https://www.mozilla.org/en-US/
• Tested 32 days ago on 2026-09-08 at 04:02 by job 260908T0359-xmh
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 753
  • Violators: 192
  • Issues: 47
• Download the full technical report (JSON)

About the issue

• Why it matters: User cannot explore the page reliably with a mouse
• Priority: lowest
• Related WCAG standard: 3.2.5
• Reported by 1 rule engine (Testaro)
• Violations: 2
• Violators: 2

About the violator

• Tag name: A
• Text: About us
• Start tag: <a class="m24-c-menu-title" href="/en-US/about/" aria-haspopup="true" aria-controls="m24-c-menu-panel-about" data-testid="m24-navigation-link-about-us" aria-expanded="false">
• XPath: /html/body/nav[1]/div[1]/div[1]/div[1]/div[1]/div[1]/ul[1]/li[2]/a[1]
• Bounding box: x = 985, y = 16, width = 78, height = 23
• Reported by Testaro

Take me there

Diagnoses

Here is how rule engines diagnose the hovering changes content issue for HTML element 199 of the Mozilla Foundation page.

1. Hovering over the element changes the related visible element count by 50 in 155ms

   Rule engine: Testaro (CVS Health)

   Rule: hover