Rinconmatematico.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Obsolete 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.
Bad value “shortcout icon” for attribute “rel” on element “link”: The string “shortcout” is not a registered keyword.
Internal encoding declaration “iso-8859-1” disagrees with the actual encoding of the document (“utf-8”).
Bad value “text/html; charset=ISO-8859-1” for attribute “content” on element “meta”: “iso-8859-1” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.
Bad value “Content-Script-Type” for attribute “http-equiv” on element “meta”.
Bad value “Content-Style-Type” for attribute “http-equiv” on element “meta”.
Malformed byte sequence: “a0”.
Malformed byte sequence: “ed”.
Bad value “http://rinconmatematico.com/cohomologia/Seminario I.pdf” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Malformed byte sequence: “f3”.
Warnings:
This document appears to be written in Spanish. Consider adding “lang="es"” (or variant) to the “html” start tag.
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