Ich bin gerade etwas geschockt, warum sind folgende Meta Angaben nicht gültig?
Bad value publisher for attribute name on element meta: Keyword publisher is not registered.
<meta name="publisher" content="">
Bad value date for attribute name on element meta: Keyword date is not registered.
<meta name="date" content="" />
Bad value copyright for attribute name on element meta: Keyword copyright is not registered.
<meta name="copyright" content="">
Bad value language for attribute http-equiv on element meta
<meta http-equiv="language" content="deutsch, de">
getestet unter: http://validator.w3.org