Errors:
CSS: “text-rendering”: Property “text-rendering” doesn't exist.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “wiadomosci”.
Attribute “kolorowych” not allowed on element “a” at this point.
Attribute “strefach” not allowed on element “a” at this point.
Attribute “mog” not allowed on element “a” at this point.
Attribute “by” not allowed on element “a” at this point.
Attribute “inne” not allowed on element “a” at this point.
Attribute “zasady” not allowed on element “a” at this point.
Attribute “funkcjonowania” not allowed on element “a” at this point.
Attribute “szk” not allowed on element “a” at this point.
Element “a” is missing one or more of the following attributes: “aria-checked”, “role”.
Attribute “type” not allowed on element “iframe” at this point.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
Bad value “100%” for attribute “height” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “ytplayer”.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The first occurrence of ID “wiadomosci” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “ytplayer” was here.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Poland PL