Odi.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “charset” attribute on a “meta” element found after the first 1024 bytes.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
Bad value “cleartype” for attribute “http-equiv” on element “meta”.
Attribute “about” not allowed on element “article” at this point.
Duplicate attribute “class”.
Attribute “about” not allowed on element “div” at this point.
Bad value “https://www.flickr.com/photos/overseas-development-institute/sets/72157654354680749?width=100%&height=100%&inline=true#galleria-lightbox-72157654354680749” for attribute “href” on element “a”: Percentage ("%") is not followed by two hexadecimal digits.
Attribute “addthis:url” not allowed on element “div” at this point.
Attribute “addthis:title” not allowed on element “div” at this point.
Attribute “tw:via” not allowed on element “a” at this point.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “article” role is unnecessary for element “article”.
Attribute “addthis:url” is not serializable as XML 1.0.
Attribute “addthis:title” is not serializable as XML 1.0.
Attribute “tw:via” is not serializable as XML 1.0.
The “contentinfo” role is unnecessary for element “footer”.
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