Madscience.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
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.
The “version” attribute on the “html” element is obsolete. You can safely omit it.
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Bad value “imagetoolbar” for attribute “http-equiv” on element “meta”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “facebook” for attribute “rel” on element “a”: The string “facebook” is not a registered keyword.
Bad value “twitter” for attribute “rel” on element “a”: The string “twitter” is not a registered keyword.
Duplicate ID “tabs-1”.
Attribute “height” not allowed on element “a” at this point.
Attribute “width” not allowed on element “a” at this point.
Element “area” is missing required attribute “alt”.
Warnings:
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “tabs-1” 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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