Articulo19.org 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.
Bad value “76%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
Duplicate attribute “class”.
Stray end tag “h1”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “action” on element “form”: Must be non-empty.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “{” instead.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The value of attribute “src” on element “img” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The “form” role is unnecessary for element “form”.
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