Colabug.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 “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Duplicate ID “style-css”.
Bad value “_new” for attribute “target” on element “a”: Reserved keyword “new” used.
Character reference was not terminated by a semicolon.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “sapn” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
Stray end tag “span”.
End tag “h2” seen, but there were open elements.
Unclosed element “sapn”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The first occurrence of ID “style-css” was here.
This document appears to be written in Simplified Chinese. Consider adding “lang="zh-hans"” (or variant) to the “html” start tag.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
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