Rstudio.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://fonts.googleapis.com/css?family=Source+Sans+Pro:300|Source+Sans+Pro:200&subset=latin” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “retina_logo_url” not allowed on element “img” at this point.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
Heading cannot be a child of another heading.
Stray end tag “h2”.
No “p” element in scope but a “p” end tag seen.
The “center” element is obsolete. Use CSS instead.
Warnings:
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “main” role is unnecessary for element “main”.
Empty heading.
The “contentinfo” role is unnecessary for element “footer”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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