Hydrogenaud.io W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Duplicate ID “header”.
End tag “aside” seen, but there were open elements.
Unclosed element “section”.
Stray end tag “section”.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
An element with the attribute “role=menuitem” must not appear as a descendant of the “a” element.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “underline;\"” not allowed on element “span” at this point.
CSS: “\"text-decoration”: Parse Error.
Warnings:
The first occurrence of ID “header” was here.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Attribute “underline;\"” is not serializable as XML 1.0.
Empty heading.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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