Kilotest: Diagnoses of ID not unique violation by HTML element 3021 on Northwest Natural Gas page

Basics

About the Northwest Natural Gas page

• URL: https://www.nwnatural.com/
• Tested 7 days ago by job wta on 2026-05-26 at 03:09

About HTML element 3021

• Tag name: circle
• Text: [not applicable]
• Start tag: <circle id="container" fill-opacity="0.5" fill="#A8DDE7" cx="20" cy="20" r="20">
• XPath: /html/body/svg[1]/defs[1]/symbol[203]/g[1]/g[1]/circle[1]
• 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 tools diagnose the ID not unique issue for HTML element 3021 of the Northwest Natural Gas page.

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

   Tool: HTML CodeSniffer (Squiz Labs)

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

2. [failed]

   Tool: QualWeb (University of Lisbon)

   Rule: QW-BP30