Errors:
Attribute “xmlns:xlink” not allowed here.
A “charset” attribute on a “meta” element found after the first 1024 bytes.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Attribute “itemprop” not allowed on element “link” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “link” is missing one or more of the following attributes: “href”, “itemprop”, “property”, “rel”, “resource”.
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Stray end tag “link”.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
Bad value for attribute “srcset” on element “img”: Width for image “https://www.501commons.or…1c0-abb2-10b3ae5f462f.png” is identical to width for image “https://www.501commons.or…dbb-99f2-cc48117bdb0a.png”.
Bad value for attribute “srcset” on element “img”: Width for image “https://www.501commons.or…4d2-9fd6-22a53018df99.png” is identical to width for image “https://www.501commons.or…786-ae34-57af4454cea7.png”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
Attribute with the local name “xmlns:xlink” is not serializable as XML 1.0.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “complementary” role is unnecessary for element “aside”.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English but the “html” start tag has an empty “lang” attribute. Consider using “lang="en"” (or variant) instead.
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