Kilotest: Violations of z-index not zero issue for 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 predict the effect of clicking
• Priority: lowest
• Related WCAG standard: 1.4
• Reported by 1 rule engine (Testaro)
• Violations: 6
• Violators: 6

Violators

Here are the HTML elements reported to violate rules belonging to the z-index not zero issue.

Take me there links will open the page in a new tab and try to scroll to the element and highlight it. This does not always succeed. You can return here by closing the new tab.

• Element 123

  • 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: [not obtained]
  • Reported by Testaro
  • Take me there
  • What diagnoses were reported?

• Element 132

  • 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
  • Reported by Testaro
  • What diagnoses were reported?

• Element 142

  • Tag name: LI
  • Text: Products
  • Start tag: <li class="m24-c-menu-category mzp-has-drop-down mzp-js-expandable">
  • XPath: /html/body/nav[1]/div[1]/div[1]/div[1]/div[1]/div[1]/ul[1]/li[1]
  • Bounding box: x = 833, y = 16, width = 128, height = 39
  • Reported by Testaro
  • What diagnoses were reported?

• Element 144

  • Tag name: DIV
  • Text: Close Products menu … All products
  • Start tag: <div class="m24-c-menu-panel" id="m24-c-menu-panel-products" data-testid="m24-navigation-panel-products">
  • XPath: /html/body/nav[1]/div[1]/div[1]/div[1]/div[1]/div[1]/ul[1]/li[1]/div[1]
  • Bounding box: [not obtained]
  • Reported by Testaro
  • Take me there
  • What diagnoses were reported?

• Element 198

  • Tag name: LI
  • Text: About us
  • Start tag: <li class="m24-c-menu-category mzp-has-drop-down mzp-js-expandable">
  • XPath: /html/body/nav[1]/div[1]/div[1]/div[1]/div[1]/div[1]/ul[1]/li[2]
  • Bounding box: x = 961, y = 16, width = 126, height = 39
  • Reported by Testaro
  • Take me there
  • What diagnoses were reported?

• Element 200

  • Tag name: DIV
  • Text: Close About us menu … Mozilla New Products
  • Start tag: <div class="m24-c-menu-panel" id="m24-c-menu-panel-about" data-testid="m24-navigation-menu-about-us">
  • XPath: /html/body/nav[1]/div[1]/div[1]/div[1]/div[1]/div[1]/ul[1]/li[2]/div[1]
  • Bounding box: [not obtained]
  • Reported by Testaro
  • Take me there
  • What diagnoses were reported?