Errors:
Bad value “el, GR” for attribute “lang” on element “html”: The language subtag “el, gr” is not a valid language subtag.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “follow” for attribute “rel” on element “a”: The string “follow” is not a registered keyword.
The element “button” must not appear as a descendant of the “a” element.
Element “p” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
End tag “section” seen, but there were open elements.
Unclosed element “div”.
Element “button” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “functions” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
Element “panel” not allowed as child of element “main” in this context. (Suppressing further errors from this subtree.)
Start tag “a” seen but an element of the same type was already open.
End tag “a” violates nesting rules.
Cannot recover after last error. Any further errors will be ignored.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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).
Empty heading.
Greece GR