Errors:
Bad value “ImageToolbar” for attribute “http-equiv” on element “meta”.
Duplicate attribute “data-options”.
Bad value “Menu” for attribute “rel” on element “a”: The string “Menu” is not a registered keyword.
Bad value “User” for attribute “rel” on element “a”: The string “User” is not a registered keyword.
Element “img” is missing required attribute “src”.
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Duplicate attribute “class”.
Attribute “datatype” not allowed on element “a” at this point.
Attribute “datatype” not allowed on element “span” at this point.
“=” at the start of an unquoted attribute value. Probable cause: Stray duplicate equals sign.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Bad value “footer columns” for attribute “id” on element “div”: An ID must not contain whitespace.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “main” role is unnecessary for element “main”.
The “complementary” role is unnecessary for element “aside”.
The “contentinfo” role is unnecessary for element “footer”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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