Errors:
Element “meta” is missing one or more of the following attributes: “content”, “property”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “header-logo”.
Duplicate ID “sidebar-underlay”.
Duplicate ID “sidebar-menu”.
The element “button” must not appear as a descendant of the “a” element.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “true” for attribute “allowfullscreen” on element “iframe”.
Bad value “” for attribute “src” on element “iframe”: Must be non-empty.
Attribute “color” not allowed on element “div” at this point.
Attribute “messenger_app_id” not allowed on element “div” at this point.
Attribute “page_id” not allowed on element “div” at this point.
Attribute “size” not allowed on element “div” at this point.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Stray start tag “script”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “header-logo” was here.
The first occurrence of ID “sidebar-underlay” was here.
The first occurrence of ID “sidebar-menu” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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