Detektor.fm W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “http://www.w3.org/1999/html” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Attribute “xmlns:v” not allowed here.
Attribute “preload” not allowed on element “span” at this point.
Attribute “controls” not allowed on element “span” at this point.
Element “source” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The “sizes” attribute may be specified only if the “srcset” attribute is also present.
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/addyn|3.0|59|5891502|0|1356|ADTECH” for attribute “src” on element “script”: Illegal character in path segment: “|” is not allowed.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Attribute with the local name “xmlns:v” is not serializable as XML 1.0.
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