Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Stray end tag “input”.
Duplicate attribute “type”.
Attribute “href” not allowed on element “button” at this point.
Bad value “submit” for attribute “type” on element “a”: Subtype missing.
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”.
Named character reference was not terminated by a semicolon. (Or “&” should have been escaped as “&”.)
The “center” element is obsolete. Use CSS instead.
Bad value “display:none;” for attribute “border” on element “img”: Only “0” is a permitted zero literal.
Bad value “telefono” for attribute “type” on element “input”.
Attribute “placeholder” is only allowed when the input type is “email”, “number”, “password”, “search”, “tel”, “text”, or “url”.
Bad value “captchavalue” for attribute “type” on element “input”.
Stray end tag “h4”.
End tag “p” seen, but there were open elements.
Unclosed element “span”.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
The “for” attribute of the “label” element must refer to a non-hidden form control.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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