Dartmouth.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Legacy doctype. Expected “<!DOCTYPE html>”.
The “version” attribute on the “html” element is obsolete. You can safely omit it.
A “charset” attribute on a “meta” element found after the first 1024 bytes.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Attribute “about” not allowed on element “div” at this point.
Attribute “content” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
Bad value “menu” for attribute “role” on element “h2”.
Bad value “menu” for attribute “role” on element “nav”.
A numeric character reference expanded to the C1 controls range.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “list” role is unnecessary for element “ul”.
The “listitem” role is unnecessary for element “li”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
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