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”.
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “center” element is obsolete. Use CSS instead.
The element “header” must not appear as a descendant of the “footer” element.
Bad value “copyrightHolder” for attribute “itemtype” on element “a”: The string “copyrightHolder” is not an absolute URL.
The “itemtype” attribute must not be specified on elements that do not have an “itemscope” attribute specified.
Bad value “copyrightYear” for attribute “itemtype” on element “span”: The string “copyrightYear” is not an absolute URL.
Attribute “content” not allowed on element “span” at this point.
End tag “div” seen, but there were open elements.
Unclosed element “center”.
Attribute “popupally-popup” not allowed on element “form” at this point.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “complementary” role is unnecessary for element “aside”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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