Kilotest: Diagnoses of invalid at-rule
violation by HTML element 0 on Prometheus page
Here is how tools diagnose the invalid at-rule
issue for HTML element 0 of the Prometheus page.
Basics
- About the
invalid at-rule
issue- Why it matters: Document cannot be properly displayed in particular contexts
- Priority: high
- Related WCAG standard: 4.1
- About the Prometheus page
- URL:
https://www.joinprometheus.org/ - Tested on 2026-04-07 at 19:19
- URL:
- About HTML element 0
- Tag name:
HTML - Text: [not applicable]
- Start tag:
<html lang="en" style="scroll-padding-top: 0px;"> - XPath:
/html - Bounding box: x = 0, y = 0, width = 1920, height = 1080
- Tag name:
Diagnoses
- CSS: Unrecognized at-rule @view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unrecognized at-rule @container
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unrecognized at-rule @container
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unrecognized at-rule @container
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unrecognized at-rule @container
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unrecognized at-rule @container
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unrecognized at-rule @container
Tool: Html Checker API (World Wide Web Consortium)