Errors:
Legacy doctype. Expected “<!DOCTYPE html>”.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
The “version” attribute on the “html” element is obsolete. You can safely omit it.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “{” instead.
A “charset” attribute on a “meta” element found after the first 1024 bytes.
A document must not include more than one “meta” element with a “charset” attribute.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
The “width” attribute on the “table” element is obsolete. Use CSS instead.
The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.
The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.
The “border” attribute on the “table” element is obsolete. Use CSS instead.
The “width” attribute on the “td” element is obsolete. Use CSS instead.
The “valign” attribute on the “td” element is obsolete. Use CSS instead.
The “bgcolor” attribute on the “td” element is obsolete. Use CSS instead.
The “align” attribute on the “img” element is obsolete. Use CSS instead.
Attribute “pubdate” not allowed on element “time” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
Bad value “boletín gratuito para estar siempre al día y recibir todos los meses noticias relacionados con el mundo del marketing” for attribute “longdesc” on element “img”: Illegal character in path segment: space is not allowed.
The “longdesc” attribute on the “img” element is obsolete. Use a regular “a” element to link to the description.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate attribute “target”.
Stray start tag “script”.
Warnings:
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in Spanish. Consider adding “lang="es"” (or variant) to the “html” start tag.
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