Tecnologia21.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.
The “frameborder” attribute on the “iframe” element is obsolete.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.
End tag “br”.
End tag “div” seen, but there were open elements.
Unclosed element “section”.
Duplicate ID “resenas”.
Duplicate ID “tutoriales”.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “g:plusone” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Stray end tag “section”.
Stray end tag “div”.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “{” instead.
Warnings:
The first occurrence of ID “resenas” was here.
The first occurrence of ID “tutoriales” was here.
Element name “g:plusone” cannot be represented as XML 1.0.
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