Whoi.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “dl” is missing a required child element.
No space between attributes.
Duplicate ID “search”.
Element “form” not allowed as child of element “dl” in this context. (Suppressing further errors from this subtree.)
Element “li” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “aria-autoclose” not allowed on element “div” at this point.
Bad value “” for attribute “size” on element “input”: The empty string is not a valid positive integer.
Attribute “alt” not allowed on element “input” at this point.
Element “h3” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “h4” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Start tag “a” seen but an element of the same type was already open.
End tag “a” violates nesting rules.
Cannot recover after last error. Any further errors will be ignored.
Warnings:
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “search” was here.
Empty heading.
United States US