Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
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 “//fonts.googleapis.com/css?family=Open+Sans:300|Open+Sans:400|Open+Sans:700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Bad value “//fonts.googleapis.com/css?family=Lato:300|Lato:400|Lato:700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Stray doctype.
Duplicate ID “arrow-25-icon”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “xmlns:cc” not allowed here.
Attribute “xmlns:dc” not allowed here.
Attribute “xmlns:inkscape” not allowed here.
Attribute “xmlns:rdf” not allowed here.
Attribute “xmlns:sodipodi” not allowed here.
Attribute “xmlns:svg” not allowed here.
Attribute “inkscape:output_extension” not allowed on element “svg” at this point.
Attribute “inkscape:version” not allowed on element “svg” at this point.
Attribute “sodipodi:docname” not allowed on element “svg” at this point.
Attribute “sodipodi:version” not allowed on element “svg” at this point.
The “font” element is obsolete. Use CSS instead.
End tag “br”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
No “p” element in scope but a “p” end tag seen.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “arrow-25-icon” was here.
Attribute with the local name “xmlns:cc” is not serializable as XML 1.0.
Attribute with the local name “xmlns:dc” is not serializable as XML 1.0.
Attribute with the local name “xmlns:inkscape” is not serializable as XML 1.0.
Attribute with the local name “xmlns:rdf” is not serializable as XML 1.0.
Attribute with the local name “xmlns:sodipodi” is not serializable as XML 1.0.
Attribute with the local name “xmlns:svg” is not serializable as XML 1.0.
Attribute “inkscape:output_extension” is not serializable as XML 1.0.
Attribute “inkscape:version” is not serializable as XML 1.0.
Attribute “sodipodi:docname” is not serializable as XML 1.0.
Attribute “sodipodi:version” is not serializable as XML 1.0.
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.
Brazil BR