Students.ch W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Attribute “xmlns:fb” not allowed here.
Attribute “xmlns:google” not allowed here.
Bad value “” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Bad value “imagetoolbar” for attribute “http-equiv” on element “meta”.
Start tag “a” seen but an element of the same type was already open.
Stray end tag “a”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “alt” not allowed on element “a” at this point.
Warnings:
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
Attribute with the local name “xmlns:google” is not serializable as XML 1.0.
Attribute “xmlns” is not serializable as XML 1.0.
Unsupported SVG version specified. This validator only supports SVG 1.1. The recommended way to suppress this warning is to remove the “version” attribute altogether.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
This document appears to be written in German. Consider adding “lang="de"” (or variant) to the “html” start tag.
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