Sega.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “Last-Modified” for attribute “http-equiv” on element “meta”.
Duplicate ID “link-history”.
Duplicate ID “link-header-other”.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
Element “style” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
Bad value “https://info-wonder.sega.jp/?p=3176 https://www.gamers.co.jp/museum/80308/ ” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “ul” not allowed as child of element “h3” in this context. (Suppressing further errors from this subtree.)
Element “script” must not have attribute “charset” unless attribute “src” is also specified.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Warnings:
The “banner” role is unnecessary for element “header”.
The first occurrence of ID “link-history” was here.
The first occurrence of ID “link-header-other” was here.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
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