Virtualroom.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “nodeid” not allowed on element “html” at this point.
Attribute “nodeid” not allowed on element “body” at this point.
Duplicate ID “headerExpandLink”.
Stray end tag “input”.
Bad value “” for attribute “id” on element “ul”: An ID must not be the empty string.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “type” attribute is unnecessary for JavaScript resources.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “headerExpandLink” was here.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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