Bett1.de W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
Attribute “async” not allowed on element “link” at this point.
Bad value “header” for attribute “role” on element “div”.
End tag “li” implied, but there were open elements.
Unclosed element “a”.
Start tag “a” seen but an element of the same type was already open.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “Ebene_2”.
The element “label” must not appear as a descendant of the “a” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Stray end tag “div”.
Bad value “160px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Bad value “auto” for attribute “height” on element “img”: Expected a digit but saw “a” instead.
Warnings:
The first occurrence of ID “Ebene_2” was here.
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