Kilotest: Diagnoses of ID not unique violation by HTML element 243 on Tradeoffs page

Basics

About the Tradeoffs page

• URL: https://tradeoffs.org/
• Tested 30 days ago by job 5g2 on 2026-06-20 at 13:59

About HTML element 243

• Tag name: SECTION
• Text: [not applicable]
• Start tag: <section id="nav_menu-2" class="below-content widget widget_nav_menu">
• XPath: /html/body/aside[2]/section[1]
• Bounding box: x = -1900, y = 60, width = 360, height = 316

About the ID not unique issue

• Why it matters: User may be pointed to the wrong item
• Priority: highest
• Related WCAG standard: 4.1.1

Diagnoses

Here is how rule engines diagnose the ID not unique issue for HTML element 243 of the Tradeoffs page.

1. Duplicate id attribute value "nav_menu-2" found on the web page.

   Tool: HTML CodeSniffer (Squiz Labs)

   Rule: E-WCAG2AAA.Principle4.Guideline4_1.4_1_1.F77

2. Duplicate ID nav_menu-2.

   Tool: Html Checker API (World Wide Web Consortium)