Kilotest: Diagnoses of ID not unique violation by HTML element 3055 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 3055

• Tag name: polygon
• Text: [not applicable]
• Start tag: <polygon id="Stroke-1401" points="0 33.2504298 2.9351376 30.3590881 5.87027521 33.2504298 8.80541281 30.3590881 11.7405504 33.2504298 14.675688 30.3590881 17.6108256 33.2504298 20.5459632 30.3590881 23.4811008 33.2504298 23.4811008 0 20.5459632 2.89134173 17.6108256 0 14.675688 2.89134173 11.7405504 0 8.80541281 2.89134173 5.87027521 0 2.9351376 2.89134173 0 0">
• XPath: /html/body/svg[1]/defs[1]/symbol[206]/g[1]/g[1]/g[1]/g[1]/g[1]/polygon[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 3055 of the Northwest Natural Gas page.

1. Duplicate id attribute value "Stroke-1401" 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