Blackboard.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The “banner” role is unnecessary for element “header”.
The first occurrence of ID “” was here.
The “main” role is unnecessary for element “main”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “article” role is unnecessary for element “article”.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
Bad value “no” for attribute “focusable” on element “svg”.
Bad value “” for attribute “aria-labelledby” on element “nav”: An IDREFS value must contain at least one non-whitespace character.
Bad value “” for attribute “id” on element “h2”: An ID must not be the empty string.
Duplicate ID “”.
Bad value “” for attribute “width” on element “video”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “video”: The empty string is not a valid non-negative integer.
Element “source” is missing required attribute “src”.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “” for attribute “id” on element “span”: An ID must not be the empty string.
End tag “figure” seen, but there were open elements.
Unclosed element “div”.
The value of the “for” attribute of the “label” element must be the ID of a non-hidden form control.
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