Kilotest: Diagnoses of ID not unique violation by HTML element 270 on Oregon Museum of Science and Industry page

Basics

About the Oregon Museum of Science and Industry page

• URL: https://omsi.edu/
• Tested 20 days ago by job 42w on 2026-05-12 at 23:14

About HTML element 270

• Tag name: NAV
• Text: The Museum … Search
• Start tag: <nav id="nav-main" class="flex-grow flex flex-row items-end justify-end nav-main" role="navigation">
• XPath: /html/body/header[1]/div[2]/nav[1]
• Bounding box: x = 364, y = 100, width = 1492, height = 113

Take me there

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 tools diagnose the ID not unique issue for HTML element 270 of the Oregon Museum of Science and Industry page.

1. Duplicate id attribute value "nav-main" found on the web page.

   Tool: HTML CodeSniffer (Squiz Labs)

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

2. Duplicate ID nav-main.

   Tool: Html Checker API (World Wide Web Consortium)

3. [failed]

   Tool: QualWeb (University of Lisbon)

   Rule: QW-BP30