Errors:
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
End tag “br”.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
The “big” element is obsolete. Use CSS instead.
The element “button” must not appear as a descendant of the “a” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “about” not allowed on element “article” at this point.
Attribute “content” not allowed on element “span” at this point.
Attribute “datatype” not allowed on element “span” at this point.
Attribute “rel” not allowed on element “span” at this point.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
Attribute “about” not allowed on element “span” at this point.
End tag “big” violates nesting rules.
No “b” element in scope but a “b” end tag seen.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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