Kilotest: Diagnoses of CSS property does not exist violation by HTML element 0 on Charity Navigator page

Basics

About the page

• URL: https://www.charitynavigator.org/
• Tested 3 days ago on 2026-10-07 at 19:56 by job 261007T1941-rxh
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 720
  • Violators: 293
  • Issues: 47
• Download the full technical report (JSON)

About the issue

• Why it matters: Page cannot be properly displayed
• Priority: high
• Related WCAG standard: 4.1
• Reported by 1 rule engine (Html Checker API)
• Violations: 1
• Violators: 1

About the violator

• Tag name: HTML
• Text: [not applicable]
• Start tag: <html lang="en-US">
• XPath: /html
• Bounding box: x = 0, y = 0, width = 1920, height = 4736
• Reported by Html Checker API

Diagnoses

Here is how rule engines diagnose the CSS property does not exist issue for HTML element 0 of the Charity Navigator page.

1. CSS: interpolate-size: Property interpolate-size doesn't exist. Extract: ate-size: allow-keywords; }.e-

   Rule engine: Html Checker API (World Wide Web Consortium)

   Rule: CSS: interpolate-size: Property interpolate-size doesn't exist.