Kilotest: Diagnoses of z-index not zero violation by HTML element 166 on World Wide Web Consortium page

Here is how tools diagnose the z-index not zero issue for HTML element 166 of the World Wide Web Consortium 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 World Wide Web Consortium page
  • URL: https://www.w3.org/
  • Tested on 2026-04-03 at 03:54
• About HTML element 166
  • Take me there
  • Tag name: DIV
  • Text: Back to main menu … Ways you can support us
  • Start tag: <div class="nav__submenu" data-nav="submenu" style="" id="js-support-us-submenu">
  • XPath: /html/body/div[1]/div[1]/header[1]/nav[2]/div[1]/ul[1]/li[5]/div[1]
  • Bounding box: x = 0, y = 0, width = 0, height = 0

Diagnoses

1. z-index style property of the element is 5

   Tool: Testaro (CVS Health)

   Rule: zIndex