Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The first occurrence of ID “zone-header-wrapper” was here.
The “navigation” role is unnecessary for element “nav”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “zone-footer-wrapper” was here.
Errors:
Duplicate ID “zone-header-wrapper”.
Bad value “http://www.mnhs.org/calendar?c=Classes and Workshops” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://www.mnhs.org/calendar?c=Lectures and Talks” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://www.mnhs.org/calendar?c=Music and Performances” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://www.mnhs.org/calendar?c=Native American” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Element “img” is missing required attribute “src”.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “content” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
The “font” element is obsolete. Use CSS instead.
End tag “p” implied, but there were open elements.
Unclosed element “span”.
Stray end tag “span”.
No “p” element in scope but a “p” end tag seen.
Stray end tag “source”.
Attribute “u” not allowed on element “div” at this point.
Attribute “u” not allowed on element “img” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “u” not allowed on element “span” at this point.
Duplicate ID “zone-footer-wrapper”.
United States US