Ptc.edu 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 “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “video_hE2lDn9kmfw” was here.
The first occurrence of ID “video_tSNK1SuHaEI” was here.
Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
End tag “div” seen, but there were open elements.
Unclosed element “ul”.
Attribute “datatype” not allowed on element “span” at this point.
Attribute “content” not allowed on element “span” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “video_hE2lDn9kmfw”.
Duplicate ID “video_tSNK1SuHaEI”.
Element “legend” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
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