Kilotest: Diagnoses of invalid CSS at-rule violation by HTML element 0 on Effective Environmentalism page

Basics

About the page

• URL: https://effectiveenvironmentalism.org/
• Tested 3 days ago on 2026-10-07 at 21:14 by job 261007T2109-usy
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 12
  • Violations: 932
  • Violators: 375
  • Issues: 47
• Download the full technical report (JSON)

About the issue

• Why it matters: Page cannot be properly displayed in particular contexts
• 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" style="scroll-padding-top: 124px;">
• XPath: /html
• Bounding box: x = 0, y = 0, width = 1920, height = 1080
• Reported by Html Checker API

Diagnoses

Here is how rule engines diagnose the invalid CSS at-rule issue for HTML element 0 of the Effective Environmentalism page.

1. CSS: Unrecognized at-rule @view-transition Extract: tyle[20]">@view-transition {navi

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

   Rule: CSS: Unrecognized at-rule @view-transition