Showmeinstitute.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Stray doctype.
Stray start tag “html”.
Attribute “value” not allowed on element “meta” at this point.
Element “meta” is missing required attribute “content”.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “ImageToolbar” for attribute “http-equiv” on element “meta”.
Duplicate ID “main-menu”.
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 “span” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “name” on element “button”: Must not be empty.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “main-menu” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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