Knf.gov.pl W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Errors:
Attribute “placeholder” not allowed on element “input” at this point.
Attribute “placeholder” is only allowed when the input type is “email”, “number”, “password”, “search”, “tel”, “text”, or “url”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “type” not allowed on element “iframe” at this point.
Attribute “enablejsapi” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The element “iframe” must not appear as a descendant of the “a” element.
Stray end tag “div”.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
The “for” attribute of the “label” element must refer to a non-hidden form control.
The “aria-describedby” attribute must point to an element in the same document.
The “aria-controls” attribute must point to an element in the same document.
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