Kilotest: Diagnoses of element obsolete violation by HTML element 1153 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: Page includes obsolete code that the browser may fail to process
• Priority: high
• Related WCAG standard: 4.1
• Reported by 3 rule engines (Alfa + ASLint + QualWeb)
• Violations: 12
• Violators: 12

About the violator

• Tag name: HTML
• Text: [not applicable]
• Start tag: [not obtained]
• XPath: /html
• Bounding box: [not obtained]
• Reported by Alfa

Diagnoses

Here is how rule engines diagnose the element obsolete issue for HTML element 1153 of the Mozilla Foundation page.

1. The document contains deprecated elements

   Rule engine: Alfa (Siteimprove)

   Rule: r70