Errors:
Bad value “https://www.w3.org/1999/xhtml” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.
Bad start tag in “img” in “head”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “noscript”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Attribute “http-equiv” 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 “noscript” in this context. (Suppressing further errors from this subtree.)
Element “div” is missing one or more of the following attributes: “role”.
Attribute “pagespeed_no_defer” not allowed on element “img” at this point.
Bad value “http://akcje.babyonline.pl/skoda/bezpieczenstwo-w-podrozy/artykuly/jak-przygotowac-auto-do-zimy#tresc?#tresc” for attribute “href” on element “a”: Illegal character in fragment: “#” is not allowed.
Bad value “http://akcje.babyonline.pl/skoda/bezpieczenstwo-w-podrozy/artykuly/bezpieczna-jazda-po-zmroku#tresc?#tresc” for attribute “href” on element “a”: Illegal character in fragment: “#” is not allowed.
Bad value “http://akcje.babyonline.pl/skoda/bezpieczenstwo-w-podrozy/konkurs#start?#start” for attribute “href” on element “a”: Illegal character in fragment: “#” is not allowed.
The “aria-labelledby” attribute must point to an element in the same document.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
Consider avoiding viewport values that prevent users from resizing documents.
This document appears to be written in Polish. Consider adding “lang="pl"” (or variant) to the “html” start tag.
Poland PL