Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
The “profile” attribute on the “head” element is obsolete.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 “value” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “content”, “property”.
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.
Bad value “https://www.quantumdiaries.org/wp-content/plugins/quantum_diaries_user_pics_header/user_pics/James Doherty.png” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “https://www.quantumdiaries.org/bio/?user=James Doherty” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.quantumdiaries.org/wp-content/plugins/quantum_diaries_user_pics_header/user_pics/Andrea Signori.png” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “https://www.quantumdiaries.org/bio/?user=Andrea Signori” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.quantumdiaries.org/wp-content/plugins/quantum_diaries_user_pics_header/user_pics/Aidan Randle-Conde.png” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “https://www.quantumdiaries.org/bio/?user=Aidan Randle-Conde” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.quantumdiaries.org/wp-content/plugins/quantum_diaries_user_pics_header/user_pics/Richard Ruiz.png” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “https://www.quantumdiaries.org/bio/?user=Richard Ruiz” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.quantumdiaries.org/wp-content/plugins/quantum_diaries_user_pics_header/user_pics/Adam Davis.png” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “https://www.quantumdiaries.org/bio/?user=Adam Davis” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.quantumdiaries.org/wp-content/plugins/quantum_diaries_user_pics_header/user_pics/Seth Zenz.png” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “https://www.quantumdiaries.org/bio/?user=Seth Zenz” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.quantumdiaries.org/wp-content/plugins/quantum_diaries_user_pics_header/user_pics/Ken Bloom.png” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “https://www.quantumdiaries.org/bio/?user=Ken Bloom” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Warnings:
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Empty heading.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.