Kilotest: Violations of invalid CSS at-rule issue for Virtual Science Teachers page

Basics

About the page

• URL: https://virtualscienceteachers.org/
• Tested 2 days ago on 2026-10-07 at 23:08 by job 261007T2305-1s9
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 12
  • Violations: 1118
  • Violators: 496
  • 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)
• Violations: 102
• Violators: 1

Violators

Here are the HTML elements reported to violate rules belonging to the invalid CSS at-rule issue.

• Element 0

  • Tag name: HTML
  • Text: [not applicable]
  • Start tag: <html lang="en-US">
  • XPath: /html
  • Bounding box: x = 0, y = 0, width = 1920, height = 5089
  • Reported by Html Checker
  • What diagnoses were reported?