Errors:
Attribute “xmlns:fb” not allowed here.
Bad value “og:http://ogp.me/ns# fb:http://ogp.me/ns/fb# bezuzyteczna_pl: http://ogp.me/ns/fb/bezuzyteczna_pl#” for attribute “prefix” on element “head”.
Bad value “https://fonts.googleapis.com/css?family=Frijole|Roboto:100,300,400,500,700,900|Roboto+Condensed:300,400,700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Bad value “(device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 1)” for attribute “media” on element “link”: Expected a CSS media feature but saw “device-width” instead.
Bad value “(device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 2)” for attribute “media” on element “link”: Expected a CSS media feature but saw “device-width” instead.
Bad value “(device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2)” for attribute “media” on element “link”: Expected a CSS media feature but saw “device-width” instead.
Bad value “(device-width: 768px) and (device-height: 1024px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 1)” for attribute “media” on element “link”: Expected a CSS media feature but saw “device-width” instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “0” for attribute “autocomplete” on element “input”: The string “0” is not a valid autofill field name.
Bad value “” for attribute “name” on element “button”: Must not be empty.
Duplicate ID “l_Ad”.
Duplicate attribute “data-show-posts”.
Warnings:
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “l_Ad” was here.
This document appears to be written in Polish. Consider adding “lang="pl"” (or variant) to the “html” start tag.
Poland PL