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 “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “gesture” not allowed on element “iframe” at this point.
Attribute “allow” not allowed on element “iframe” at this point.
Saw “<” when expecting an attribute name. Probable cause: Missing “>” immediately before.
Duplicate attribute “width”.
Duplicate attribute “height”.
Attribute “<iframe” not allowed on element “iframe” at this point.
The “center” element is obsolete. Use CSS instead.
Attribute “border” not allowed on element “iframe” at this point.
The “marginwidth” attribute on the “iframe” element is obsolete. Use CSS instead.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
End tag “div” seen, but there were open elements.
Unclosed element “center”.
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”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “article” role is unnecessary for element “article”.
The “complementary” role is unnecessary for element “aside”.
Attribute “<iframe” is not serializable as XML 1.0.
The “contentinfo” role is unnecessary for element “footer”.
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