Kilotest: Diagnoses of invalid at-rule violation by HTML element 0 on Prevention of Blindness Society of Metropolitan Washington page

Basics

About the Prevention of Blindness Society of Metropolitan Washington page

URL: https://www.youreyes.org/
Tested 43 days ago by job 8hf on 2026-06-08 at 02:19

About HTML element 0

Tag name: HTML
Text: [not applicable]
Start tag: <html lang="en-US" data-uw-w-loader="">
XPath: /html
Bounding box: x = 0, y = 0, width = 1920, height = 4455

About the invalid at-rule issue

Why it matters: Document cannot be properly displayed in particular contexts
Priority: high
Related WCAG standard: 4.1

Diagnoses

Here is how rule engines diagnose the invalid at-rule issue for HTML element 0 of the Prevention of Blindness Society of Metropolitan Washington page.

CSS: This profile has a very specific syntax for @charset: @charset followed by exactly one space, followed by the name of the encoding in quotes, followed immediately by a semicolon.
Tool: Html Checker (World Wide Web Consortium)