Goschool.com.ar W3C HTML Markup Validation
HTML markup errors and warnings
(Rescan now...)
Errors:
Bogus doctype.
Quirky doctype. Expected “<!DOCTYPE html>”.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “Expires” for attribute “http-equiv” on element “meta”.
Attribute “defer” not allowed on element “link” at this point.
Bad start tag in “img” in “head”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “noscript”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Duplicate attribute “alt”.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The “navigation” role is unnecessary for element “nav”.
This document appears to be written in Spanish but the “html” start tag has an empty “lang” attribute. Consider using “lang="es"” (or variant) instead.
Argentina AR