Colum.edu 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”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “search-form”.
Duplicate ID “search”.
Element “img” is missing required attribute “src”.
Attribute “height” not allowed on element “div” at this point.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “aria-labelledby” attribute must point to an element in the same document.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “search-form” was here.
The first occurrence of ID “search” was here.
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