Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The “type” attribute for the “style” element is not needed and should be omitted.
The first occurrence of ID “” was here.
Element name “gcse:search” cannot be represented as XML 1.0.
The value of attribute “title” on element “a” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The value of attribute “alt” on element “img” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
Text run is not in Unicode Normalization Form C.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The value of attribute “title” on element “img” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The first occurrence of ID “post-slider-technical” was here.
The value of attribute “src” on element “img” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The first occurrence of ID “post-slider-topic” was here.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
This document appears to be written in Vietnamese but the “html” start tag has “lang="en"”. Consider using “lang="vi"” (or variant) instead.
Errors:
CSS: Parse Error.
Attribute “name” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
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”, “modulepreload”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
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 “” for attribute “id” on element “li”: An ID must not be the empty string.
Duplicate ID “”.
Element “gcse:search” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “atl” not allowed on element “img” at this point.
Duplicate ID “post-slider-technical”.
Bad value “1” for attribute “allowfullscreen” on element “iframe”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Attribute “url” not allowed on element “div” at this point.
Attribute “video-url” not allowed on element “div” at this point.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
End tag “section” seen, but there were open elements.
Unclosed element “div”.
Duplicate ID “post-slider-topic”.
Attribute “post_id” not allowed on element “div” at this point.
End tag “div” seen, but there were open elements.
Unclosed element “section”.
Stray end tag “section”.
Stray end tag “div”.
Element “ul” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “li” not allowed as child of element “h6” in this context. (Suppressing further errors from this subtree.)
End tag “ul” seen, but there were open elements.
Unclosed element “h6”.
Stray end tag “h5”.
Viet Nam VN