Mdn.co.jp W3C HTML Markup Validation
HTML markup errors and warnings
(Rescan now...)
Errors:
Bad start tag in “iframe” in “head”.
Element “head” is missing a required instance of child element “title”.
Stray end tag “noscript”.
Attribute “name” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
Element “title” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “ga_action” not allowed on element “a” at this point.
Bad value “MdN DESIGNFONT STORE” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Warnings:
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).
Japan JP