Kilotest: Diagnoses of attribute invalid violation by HTML element 478 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: Item behaves improperly
• Priority: highest
• Related WCAG standard: 1.3.1
• Reported by 1 rule engine (Html Checker API)
• Violations: 6
• Violators: 6

About the violator

• Tag name: DIV
• Text: Author(s)
• Start tag: <div class="m24-c-springboard-author" itemprop="columnTwo">
• XPath: /html/body/div[2]/main[1]/section[2]/ul[1]/li[1]/div[1]/div[3]
• Bounding box: x = 472, y = 4205, width = 172, height = 15
• Reported by Html Checker API

Take me there

Diagnoses

Here is how rule engines diagnose the attribute invalid issue for HTML element 478 of the Mozilla Foundation page.

1. The itemprop attribute was specified, but the element is not a property of any item.

   Rule engine: Html Checker API (World Wide Web Consortium)