Kilotest: Diagnoses of ID not unique violation by HTML element 130 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 130

• Tag name: ASIDE
• Text: Skip to content … Instagram
• Start tag: <aside id="mobile-sidebar-fallback" class="mobile-sidebar">
• XPath: /html/body/aside[1]
• Bounding box: x = 3206, y = 0, width = 634, height = 1080

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 130 of the Tradeoffs page.

1. Attribute <code>id="nav_menu-2"</code> should be unique. It has been defined 2 times.

   Tool: ASLint (eSSENTIAL Accessibility)

   Rule: duplicated_id_attribute