Errors:
Bad value “ utf-8” for attribute “charset” on element “meta”: Value contained “ ”, which is not a valid character in an encoding name.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:landscape)” for attribute “media” on element “link”: Deprecated media feature “min-device-width”. For guidance, see the Deprecated Media Features section in the current Media Queries specification.
Bad value “screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:portrait)” for attribute “media” on element “link”: Deprecated media feature “min-device-width”. For guidance, see the Deprecated Media Features section in the current Media Queries specification.
Bad value “screen and (max-device-width: 320px)” for attribute “media” on element “link”: Deprecated media feature “max-device-width”. For guidance, see the Deprecated Media Features section in the current Media Queries specification.
Attribute “rel” not allowed on element “span” at this point.
Duplicate attribute “data-widget-colorbutton”.
Element “gcse:search” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “div” 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 “tooltip” for attribute “rel” on element “a”: The string “tooltip” is not a registered keyword.
Duplicate ID “widget-tab-1”.
Bad value “popover-hover” for attribute “rel” on element “a”: The string “popover-hover” is not a registered keyword.
Bad value “” for attribute “id” on element “a”: An ID must not be the empty string.
Attribute “rel” not allowed on element “label” at this point.
The “align” attribute on the “td” element is obsolete. Use CSS instead.
Duplicate ID “”.
Duplicate ID “question-follow-bar”.
Duplicate ID “lblDanhMuc3”.
Duplicate ID “lblDanhMuc20”.
Duplicate ID “Wid-Content-Home-Right-Category”.
Attribute “border” not allowed on element “input” at this point.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Element name “gcse:search” cannot be represented as XML 1.0.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
The first occurrence of ID “widget-tab-1” was here.
The first occurrence of ID “” was here.
The first occurrence of ID “question-follow-bar” was here.
The first occurrence of ID “lblDanhMuc3” was here.
The first occurrence of ID “lblDanhMuc20” was here.
The first occurrence of ID “Wid-Content-Home-Right-Category” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in Vietnamese but the “html” start tag has “lang="en-us"”. Consider using “lang="vi"” (or variant) instead.
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