Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “banner” role is unnecessary for element “header”.
Attribute “href” without an explicit value seen. The attribute may be dropped by IE7.
The “navigation” role is unnecessary for element “nav”.
The “contentinfo” role is unnecessary for element “footer”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Errors:
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 “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
No “p” element in scope but a “p” end tag seen.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
Stray end tag “span”.
End tag “p” implied, but there were open elements.
Attribute “video_id” not allowed on element “div” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The element “a” must not appear as a descendant of the “button” element.
Unclosed element “a”.
No “a” element in scope but a “a” end tag seen.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “ul” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
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