Kilotest: Diagnoses of CSS invalid violation by HTML element 0 on 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
• Priority: high
• Related WCAG standard: 4.1
• Reported by 1 rule engine (Html Checker)
• Violations: 2
• Violators: 2

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 = 5089
• Reported by Html Checker

Diagnoses

Here is how rule engines diagnose the CSS invalid issue for HTML element 0 of the Virtual Science Teachers page.

1. CSS: transition: allow-discrete is not a transition value. Extract: .3s ease allow-discrete;}.e-a

   Rule engine: Html Checker (World Wide Web Consortium)

   Rule: CSS: transition: allow-discrete is not a transition value.