Bluemedia.pl W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Heading cannot be a child of another heading.
Stray end tag “h2”.
Attribute “rel” not allowed on element “h1” at this point.
Attribute “rel” not allowed on element “p” at this point.
End tag “h3” seen, but there were open elements.
Unclosed element “span”.
End tag “section” seen, but there were open elements.
Unclosed element “div”.
Bad value “dofollow” for attribute “rel” on element “a”: The string “dofollow” is not a registered keyword.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Empty heading.
This document appears to be written in Polish. Consider adding “lang="pl"” (or variant) to the “html” start tag.
Poland PL