Coursera.community W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “font|Open Sans:light,lightitalic,regular,regularitalic,600,600italic,bold,bolditalic,800,800italic-css” for attribute “id” on element “link”: An ID must not contain whitespace.
Bad value “font|Open Sans:regular,regularitalic-css” for attribute “id” on element “link”: An ID must not contain whitespace.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
End tag “br”.
Start tag “a” seen but an element of the same type was already open.
Stray end tag “a”.
Unclosed element “section”.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
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