Istruzioneer.it W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Obsolete doctype. Expected “<!DOCTYPE html>”.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
Bad value “Content-Style-Type” for attribute “http-equiv” on element “meta”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate attribute “title”.
No “p” element in scope but a “p” end tag seen.
The “hspace” attribute on the “img” element is obsolete. Use CSS instead.
The “vspace” attribute on the “img” element is obsolete. Use CSS instead.
Attribute “href” not allowed on element “button” at this point.
Stray end tag “sp<n”.
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”.
Warnings:
Empty heading.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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