Escuelapedia.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “xmlns:fb” not allowed here.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
The “big” element is obsolete.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.
The “center” element is obsolete. Use CSS instead.
Element “ins” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “wrapper”.
Element “center” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
No space between attributes.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “l” instead.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
Warnings:
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “wrapper” was here.
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