Iotsworldcongress.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
The element “header” must not appear as a descendant of the “header” element.
Duplicate ID “date”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag “br”.
The element “footer” must not appear as a descendant of the “footer” element.
Attribute “rel” not allowed on element “button” at this point.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
The “aria-labelledby” attribute must point to an element in the same document.
The “aria-describedby” attribute must point to an element in the same document.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “date” was here.
United States US