Voxeu.org W3C HTML Markup Validation
HTML markup errors and warnings
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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The “version” attribute on the “html” element is obsolete.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The “profile” attribute on the “head” element is obsolete.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.
Element “input” is missing required attribute “alt”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “” for attribute “id” on element “div”: An ID must not be the empty string.
Bad value “audio_popup” for attribute “rel” on element “a”: The string “audio_popup” is not a registered keyword.
Duplicate ID “”.
Warnings:
The first occurrence of ID “” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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