Acsendo.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English but the “html” start tag has “lang="pt-BR"”. Consider using “lang="en"” (or variant) instead.
Errors:
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.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
The element “button” must not appear as a descendant of the “a” element.
Duplicate attribute “class”.
The “aria-controls” attribute must point to an element in the same document.
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