Coursereport.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Duplicate ID “menu_data_science”.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
End tag “p” seen, but there were open elements.
Unclosed element “span”.
The element “button” must not appear as a descendant of the “a” element.
The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.
The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.
The “border” attribute on the “table” element is obsolete. Use CSS instead.
Bad value “follow” for attribute “rel” on element “a”: The string “follow” is not a registered keyword.
Attribute “parsley-validate” not allowed on element “form” at this point.
Attribute “a” not allowed on element “a” at this point.
Stray start tag “noscript”.
Warnings:
The first occurrence of ID “menu_data_science” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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