Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “” for attribute “href” on element “link”: Must be non-empty.
Element “a” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “span” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “p” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “nav” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “noscript” not allowed as child of element “hgroup” in this context. (Suppressing further errors from this subtree.)
Element “hgroup” is missing a required instance of one or more of the following child elements: “h1”, “h2”, “h3”, “h4”, “h5”, “h6”.
End tag “p” implied, but there were open elements.
Unclosed element “b”.
No “p” element in scope but a “p” end tag seen.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “alt” not allowed on element “a” at this point.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “https://twitter.com/intent/retweet?tweet_id=982245035713310720&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/like?tweet_id=982245035713310720&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/retweet?tweet_id=978990660970676224&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/like?tweet_id=978990660970676224&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/retweet?tweet_id=978950997426008064&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/like?tweet_id=978950997426008064&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/retweet?tweet_id=975682352268668928&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/like?tweet_id=975682352268668928&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/retweet?tweet_id=973170314032111616&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/like?tweet_id=973170314032111616&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/retweet?tweet_id=972608287089872896&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/like?tweet_id=972608287089872896&related=Climate Visuals” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “contentinfo” role is unnecessary for element “footer”.
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).