Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Attribute “"” is not serializable as XML 1.0.
This document appears to be written in Polish. Consider adding “lang="pl"” (or variant) to the “html” start tag.
Errors:
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “{url}” for attribute “href” on element “a”: Illegal character in path segment: “{” is not allowed.
Element “img” is missing required attribute “src”.
Bad value “/__games/{url}” for attribute “href” on element “a”: Illegal character in path segment: “{” is not allowed.
Element “p” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
The element “header” must not appear as a descendant of the “header” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
Duplicate attribute “data-widget”.
Duplicate attribute “data-label”.
Duplicate attribute “data-index”.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
No space between attributes.
Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.
Attribute “"” not allowed on element “script” at this point.
Poland PL