Apastyle.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “og:http://ogp.me/ns# fb:http://www.facebook.com/2008/fbml” for attribute “prefix” on element “html”.
Bad value “navigation” for attribute “role” on element “aside”.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
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 “navigation” role is unnecessary for element “nav”.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The “region” role is unnecessary for element “section”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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