Kilotest: Diagnoses of CSS invalid
violation by HTML element 0 on Next Generation Playground page
Basics
About the Next Generation Playground page
- URL: https://www.playnextgeneration.com/
- Tested 14 days ago by job
cg9on 2026-05-18 at 15:01
About HTML element 0
- Tag name:
HTML - Text: [not applicable]
- Start tag:
<html lang="en" style="scroll-padding-top: 151px;"> - XPath:
/html - Bounding box: x = 0, y = 0, width = 1920, height = 1080
About the CSS invalid
issue
- Why it matters: Document cannot be properly displayed
- Priority: high
- Related WCAG standard: 4.1
Diagnoses
Here is how tools diagnose the CSS invalid
issue for HTML element 0 of the Next Generation Playground page.
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: view-transition-name: Property view-transition-name doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class ::view-transition.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: view-transition-name: Property view-transition-name doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: view-transition-name: Property view-transition-name doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: view-transition-name: Property view-transition-name doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: view-transition-name: Property view-transition-name doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition-type
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition-type
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition-type
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition-type
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition-type
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition-type
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: stroke-color: Property stroke-color doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: container-type: Property container-type doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: --one-unit: Unknown dimension.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: mix-blend-mode: plus-lighter is not a mix-blend-mode value.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: opacity: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :active-view-transition
Tool: Html Checker API (World Wide Web Consortium)
- CSS: view-transition-name: Property view-transition-name doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: vector-effect: Property vector-effect doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: stroke-color: Property stroke-color doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: width: The types are incompatible.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: --rows-number: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: --rows-number: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: opacity: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: container-type: Property container-type doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: opacity: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :antialiased
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class :grayscale
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Parse Error.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class ::category.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class ::listitem.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: width: only 0 can be a unit. You must put a unit after your number.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class ::leftalignmentscrollitem.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: Unknown pseudo-element or pseudo-class ::rightalignmentscrollitem.
Tool: Html Checker API (World Wide Web Consortium)
- CSS: animation-composition: Property animation-composition doesn't exist.
Tool: Html Checker API (World Wide Web Consortium)