Errors:
Attribute “xmlns:og” not allowed here.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Stray end tag “script”.
Bad start tag in “div” in “head”.
Stray end tag “noscript”.
Attribute “name” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “100px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Duplicate ID “slide-menu”.
Bad value “543ba005-4d4f-4ece-8f0f-a5ea6bd903d7” for attribute “lang” on element “button”: Subtags must not exceed 8 characters in length.
Bad value “sitemap” for attribute “rel” on element “a”: The string “sitemap” is not a registered keyword.
Stray start tag “script”.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “{” instead.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Attribute “page_id” not allowed on element “div” at this point.
Warnings:
Attribute with the local name “xmlns:og” is not serializable as XML 1.0.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The value of attribute “title” on element “a” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The first occurrence of ID “slide-menu” was here.
Text run is not in Unicode Normalization Form C.
This document appears to be written in Vietnamese. Consider adding “lang="vi"” (or variant) to the “html” start tag.
Viet Nam VN