Warnings:
The “banner” role is unnecessary for element “header”.
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 “navbar” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Errors:
Duplicate ID “navbar”.
Bad value “” for attribute “name” on element “button”: Must not be empty.
Attribute “about” not allowed on element “div” at this point.
Attribute “about” not allowed on element “article” at this point.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “h2” not allowed as child of element “span” 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.
Element “ul” not allowed as child of element “span” 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The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “2” for attribute “border” on element “img”: Only “0” is a permitted zero literal.
The “align” attribute on the “img” element is obsolete. Use CSS instead.
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