Kilotest: Diagnoses of attribute value invalid violation by HTML element 68 on Taproot Foundation page

Basics

About the page

• URL: https://taprootfoundation.org/
• Tested 2 days ago on 2026-10-07 at 23:08 by job 261007T2305-4se
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 508
  • Violators: 244
  • Issues: 35
• Download the full technical report (JSON)

About the issue

• Why it matters: Item behaves improperly
• Priority: highest
• Related WCAG standard: 1.3.1
• Reported by 1 rule engine (Html Checker)
• Violations: 1
• Violators: 1

About the violator

• Tag name: LINK
• Text: [not applicable]
• Start tag: <link rel="stylesheet" href="https://cdn.helply.com/fonts/inter.css">
• XPath: /html/head[1]/link[12]
• Bounding box: [not obtained]
• Reported by Html Checker

Diagnoses

Here is how rule engines diagnose the attribute value invalid issue for HTML element 68 of the Taproot Foundation page.

1. Bad value https://fonts.googleapis.com/css?family=Open+Sans:400,400i|Open+Sans:400:400,400i|Impact:400,400i|Charcoal:400,400i|sans-serif:400,400i|Arial:400,400i|Helvetica:400,400i for attribute href on element link: Illegal character in query. | is not allowed.

   Rule engine: Html Checker (World Wide Web Consortium)