Clarivate.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “href” not allowed on element “h4” at this point.
Forbidden code point U+000b.
Duplicate attribute “href”.
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Duplicate attribute “class”.
The text content of element “time” was not in the required format: The literal did not satisfy the time-datetime format.
End tag “h5” seen, but there were open elements.
Unclosed element “time”.
Warnings:
This document appears to be written in Japanese. Consider adding “lang="ja"” (or variant) to the “html” start tag.
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