Kilotest: Diagnoses of invalid CSS at-rule violation by HTML element 0 on DEPLOY/US page

Basics

About the page

• URL: https://deployus.org/
• Tested 3 days ago on 2026-10-07 at 19:53 by job 261007T1941-pp1
• Summary of results:
  • Rule engines:
    • Called: 12
    • Were able to test: 12
    • Reported any rule violations: 11
  • Violations: 137
  • Violators: 75
  • Issues: 27
• 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: 2
• Violators: 1

About the violator

• Tag name: HTML
• Text: [not applicable]
• Start tag: <html xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://www.facebook.com/2008/fbml" lang="en-US" class="wf-europa-n3-inactive wf-futurapt-i5-inactive wf-futurapt-i4-inactive wf-futurapt-n4-inactive wf-futurapt-n3-inactive wf-europa-i3-inactive wf-europa-n7-inactive wf-futurapt-n6-inactive wf-futurapt-i7-inactive wf-futurapt-n5-inactive wf-futurapt-n7-inactive wf-europa-i7-inactive wf-inactive">
• XPath: /html
• Bounding box: x = 0, y = 0, width = 1920, height = 1568
• Reported by Html Checker API

Diagnoses

Here is how rule engines diagnose the invalid CSS at-rule issue for HTML element 0 of the DEPLOY/US page.

1. Style rule .mobile-nav-toggle-label not allowed outside an @scope rule in a style element in body. Extract: style[1]">.mobile-nav-toggle-label { dis

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

   Rule: Style rule .mobile-nav-toggle-label not allowed outside an @scope rule in a style element in body.

2. Style rule #block-yui_3_17_2_1_1727797873499_3230 not allowed outside an @scope rule in a style element in body. Extract: le[1]"> #block-yui_3_17_2_1_1727797873499_3230 {

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

   Rule: Style rule #block-yui_3_17_2_1_1727797873499_3230 not allowed outside an @scope rule in a style element in body.