Kelformation.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “xmlns:fb” not allowed here.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Attribute “rel” not allowed on element “iframe” at this point.
Bad value “” for attribute “name” on element “form”: Must not be empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “https://adserver.adtech.de/adlink|3.0|296|1269991|0|225|ADTECH;loc=300;grp=[group]” for attribute “href” on element “a”: Illegal character in path segment: “|” is not allowed.
Bad value “https://adserver.adtech.de/adserv|3.0|296|1269991|0|225|ADTECH;loc=300;grp=[group]” for attribute “src” on element “img”: Illegal character in path segment: “|” is not allowed.
Warnings:
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “contentinfo” role is unnecessary for element “footer”.
Empty heading.
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