Reneelab.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
End tag “p” implied, but there were open elements.
Unclosed element “span”.
No “p” element in scope but a “p” end tag seen.
Stray end tag “span”.
Stray doctype.
Stray start tag “html”.
Start tag “body” seen but an element of the same type was already open.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
Unclosed element “section”.
Stray end tag “div”.
Bad value “https://www.w3.org/1999/xlink” for the attribute “xmlns:link” (only “http://www.w3.org/1999/xlink” permitted here).
Warnings:
The “banner” role is unnecessary for element “header”.
Attribute “xmlns:xlink” with a value other than “http://www.w3.org/1999/xlink” is not serializable as XML 1.0 without changing document semantics.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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