Ngstudentexpeditions.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “type” attribute is unnecessary for JavaScript resources.
The first occurrence of ID “page” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Text run is not in Unicode Normalization Form C.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
Errors:
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Stray doctype.
Bad value “3grid-filled” for attribute “id” on element “symbol”: Not a valid XML 1.0 name.
Duplicate ID “page”.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
Stray start tag “script”.
End tag for “html” seen, but there were unclosed elements.
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