Keiunkan.co.jp 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 “Content-Style-Type” for attribute “http-equiv” on element “meta”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “itemschope” not allowed on element “body” at this point.
The “itemtype” attribute must not be specified on elements that do not have an “itemscope” attribute specified.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “130px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “auto” for attribute “height” on element “img”: Expected a digit but saw “a” instead.
Stray start tag “div”.
Warnings:
The “banner” role is unnecessary for element “header”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
Empty heading.
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