Errors:
A document must not include more than one “meta” element with a “charset” attribute.
No space between attributes.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “1290184837"” not allowed on element “meta” at this point.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
Bad value “true” for attribute “async” on element “script”.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
“=” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Attribute “alt” not allowed on element “a” at this point.
The “clear” attribute on the “br” element is obsolete. Use CSS instead.
Bad value “50px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “30px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “//adserver.adtech.de/adlink|3.0|832.1.1|5251944|0|170|ADTECH;loc=300;alias=;key=key1+key2+key3+key4” for attribute “href” on element “a”: Illegal character in path segment: “|” is not allowed.
Bad value “//adserver.adtech.de/adserv|3.0|832.1.1|5251944|0|170|ADTECH;cookie=info;loc=300;alias=;key=key1+key2+key3+key4” for attribute “src” on element “img”: Illegal character in path segment: “|” is not allowed.
Warnings:
Attribute “1290184837"” is not serializable as XML 1.0.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “banner” role is unnecessary for element “header”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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