Umdearborn.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “ImageToolbar” for attribute “http-equiv” on element “meta”.
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.)
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “main” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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