Baobinhphuoc.com.vn W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Element “meta” is missing required attribute “content”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “classid” attribute on the “object” element is obsolete. Use the “data” and “type” attributes to invoke plugins. To set a parameter with the name “classid”, use the “param” element.
The “codebase” attribute on the “object” element is obsolete. Use the “data” and “type” attributes to invoke plugins. To set a parameter with the name “codebase”, use the “param” element.
Stray end tag “embed”.
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
Bad value “dofollow” for attribute “rel” on element “a”: The string “dofollow” is not a registered keyword.
Duplicate ID “sidebar-nav”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The first occurrence of ID “sidebar-nav” was here.
This document appears to be written in Vietnamese. Consider adding “lang="vi"” (or variant) to the “html” start tag.
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