Viettelidc.com.vn W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Start tag seen without seeing a doctype first. Expected “<!DOCTYPE html>”.
Element “head” is missing a required instance of child element “title”.
Stray doctype.
Stray start tag “html”.
Stray start tag “head”.
Element “title” not allowed as child of element “form” in this context. (Suppressing further errors from this subtree.)
Attribute “name” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
Attribute “http-equiv” not allowed on element “meta” at this point.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Stray end tag “head”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “style” not allowed as child of element “form” in this context. (Suppressing further errors from this subtree.)
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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