Imooc.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
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 “Access-Control-Allow-Origin” for attribute “http-equiv” on element “meta”.
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The element “label” must not appear as a descendant of the “a” element.
Element “dl” is missing a required child element.
Bad character “.” after “<”. Probable cause: Unescaped “<”. Try escaping it as “<”.
Named character reference was not terminated by a semicolon. (Or “&” should have been escaped as “&”.)
Warnings:
This document appears to be written in Simplified Chinese. Consider adding “lang="zh-hans"” (or variant) to the “html” start tag.
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