Thiennhien.net W3C HTML Markup Validation
HTML markup errors and warnings
(Rescan now...)
Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “script” must not have attribute “charset” unless attribute “src” is also specified.
Bad value “navigation” for attribute “role” on element “ul”.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The value of attribute “alt” on element “img” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The value of attribute “title” on element “img” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The value of attribute “title” on element “a” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
Text run is not in Unicode Normalization Form C.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in Vietnamese but the “html” start tag has “lang="en-US"”. Consider using “lang="vi"” (or variant) instead.
Viet Nam VN