Sunywcc.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “border” not allowed on element “iframe” at this point.
Attribute “hspace” not allowed on element “iframe” at this point.
Attribute “vspace” not allowed on element “iframe” at this point.
The “marginwidth” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginheight” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Text not allowed in element “iframe” in this context.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “alt” not allowed on element “a” at this point.
Bad value “” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “250px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Bad value “400px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Duplicate attribute “alt”.
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.
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