Ukrainianlessons.com 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.
Duplicate ID “skew”.
Element “p” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Attribute “name” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Empty heading.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The first occurrence of ID “skew” was here.
The value of attribute “src” on element “img” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
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