Errors:
Start tag “head” seen but an element of the same type was already open.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “square” for attribute “stroke-linejoin” on element “polygon”.
Duplicate ID “login-menu”.
Duplicate ID “login-menu-email”.
Duplicate ID “login-menu-password”.
Duplicate ID “login-menu-submit”.
Duplicate ID “registration-menu”.
Duplicate ID “registration-menu-first-name”.
Duplicate ID “registration-menu-last-name”.
Duplicate ID “registration-menu-email”.
Duplicate ID “registration-menu-password”.
Duplicate ID “registration-menu-submit”.
Element “a” is missing one or more of the following attributes: “aria-checked”, “role”.
The element “button” must not appear as a descendant of the “a” element.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Bad value “http://www.w3.org/1999/html” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Attribute “alt” not allowed on element “source” at this point.
Duplicate attribute “class”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “button” role is unnecessary for element “button”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “login-menu” was here.
The first occurrence of ID “login-menu-email” was here.
The first occurrence of ID “login-menu-password” was here.
The first occurrence of ID “login-menu-submit” was here.
The first occurrence of ID “registration-menu” was here.
The first occurrence of ID “registration-menu-first-name” was here.
The first occurrence of ID “registration-menu-last-name” was here.
The first occurrence of ID “registration-menu-email” was here.
The first occurrence of ID “registration-menu-password” was here.
The first occurrence of ID “registration-menu-submit” was here.
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).
Attribute “xmlns” is not serializable as XML 1.0.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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