Errors:
Legacy doctype. Expected “<!DOCTYPE html>”.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
The “version” attribute on the “html” element is obsolete. You can safely omit it.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Element “img” is missing required attribute “src”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “gallery-staff_picks” for attribute “rel” on element “a”: The string “gallery-staff_picks” is not a registered keyword.
Bad value “button” for attribute “type” on element “a”: Subtype missing.
Attribute “alt” not allowed on element “a” at this point.
Bad value “Library Channel” for attribute “id” on element “a”: An ID must not contain whitespace.
Bad value “Online Resources” for attribute “id” on element “a”: An ID must not contain whitespace.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
United States US