Jspinyin.net 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.
Attribute “href” not allowed on element “use” at this point.
Attribute “type” not allowed on element “iframe” at this point.
Bad value “true” for attribute “allowfullscreen” on element “iframe”.
Duplicate ID “fb-root”.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “complementary” role is unnecessary for element “aside”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “list” role is unnecessary for element “ul”.
The “contentinfo” role is unnecessary for element “footer”.
The first occurrence of ID “fb-root” was here.
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