Twente.com 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.
Bad value “__blank” for attribute “target” on element “a”: Reserved keyword “_blank” used.
Bad value “http://” for attribute “href” on element “a”: Invalid host: empty host.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
Bad value “100%” for attribute “height” on element “iframe”: Expected a digit but saw “%” instead.
Attribute “allowscriptaccess” 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The “frameborder” attribute on the “iframe” element is obsolete.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.)
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
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