Tudomuaban.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Legacy doctype. Expected “<!DOCTYPE html>”.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Element “div” not allowed as child of element “small” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “dofollow” for attribute “rel” on element “a”: The string “dofollow” is not a registered keyword.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Bad character “ ” after “<”. Probable cause: Unescaped “<”. Try escaping it as “<”.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
Text run is not in Unicode Normalization Form C.
This document appears to be written in Vietnamese but the “html” start tag has “lang="en"”. Consider using “lang="vi"” (or variant) instead.
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