Kilotest: Diagnoses of ID not unique violation by HTML element 2814 on Cátedra UNESCO Legislación, Sociedad y Patrimonio page

Basics

About the Cátedra UNESCO Legislación, Sociedad y Patrimonio page

• URL: https://catedrapatrimonio.wixsite.com/ugto
• Tested 13 days ago by job auj on 2026-07-07 at 18:07

About HTML element 2814

• Tag name: DIV
• Text: [not applicable]
• Start tag: <div id="preview" style="display:none">
• XPath: [not obtained]
• Bounding box: x = 0, y = 0, width = 0, height = 0

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 2814 of the Cátedra UNESCO Legislación, Sociedad y Patrimonio page.

1. Duplicate id attribute value "preview" found on the web page.

   Tool: HTML CodeSniffer (Squiz Labs)

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

2. Duplicate ID preview.

   Tool: Html Checker API (World Wide Web Consortium)