Kilotest: Diagnoses of z-index not zero violation by HTML element 138 on Mozilla Foundation page

Basics

About the Mozilla Foundation page

• URL: https://www.mozilla.org/en-US/
• Tested 30 days ago by job 9wj on 2026-05-03 at 04:32

About HTML element 138

• Tag name: NAV
• Text: Products … About us
• Start tag: <nav class="m24-navigation-refresh enable-main-nav-sticky m24-mzp-is-sticky" aria-label="Primary">
• XPath: /html/body/nav[1]
• Bounding box: x = 0, y = 0, width = 1920, height = 57

About the z-index not zero issue

• Why it matters: User cannot predict the effect of clicking
• Priority: lowest
• Related WCAG standard: 1.4

Diagnoses

Here is how tools diagnose the z-index not zero issue for HTML element 138 of the Mozilla Foundation page.

1. z-index style property of the element is 1000

   Tool: Testaro (CVS Health)

   Rule: zIndex