Kilotest: Diagnoses of z-index not zero violation by HTML element 129 on Mozilla Foundation page

Here is how tools diagnose the z-index not zero issue for HTML element 129 of the Mozilla Foundation page.

Basics

• About the z-index not zero issue
  • Why it matters: User cannot predict the effect of clicking
  • Priority: lowest
  • Related WCAG standard: 1.4
• About the Mozilla Foundation page
  • URL: https://www.mozilla.org/en-US/
  • Tested on 2026-04-03 at 03:56
• About HTML element 129
  • Take me there
  • Tag name: ASIDE
  • Text: Help us improve your Mozilla experience … Cookie settings
  • Start tag: <aside class="moz-consent-banner" id="moz-consent-banner" role="region" aria-label="Cookie Banner" data-nosnippet="true" data-testid="consent-banner">
  • XPath: /html/body/aside[1]
  • Bounding box: x = 0, y = 0, width = 0, height = 0

Diagnoses

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

   Tool: Testaro (CVS Health)

   Rule: zIndex