Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
Bad value “expires” for attribute “http-equiv” on element “meta”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
End tag “a” violates nesting rules.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Bad value “btn” for attribute “type” on element “button”.
Bad value “” for attribute “name” on element “input”: Must not be empty.
Bad value “tooltip” for attribute “rel” on element “a”: The string “tooltip” is not a registered keyword.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Empty heading.
This document appears to be written in Portuguese. Consider adding “lang="pt"” (or variant) to the “html” start tag.
Brazil BR