Povertyusa.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.
Attribute “version” not allowed on element “symbol” at this point.
Attribute “x” not allowed on element “symbol” at this point.
Attribute “y” not allowed on element “symbol” at this point.
Attribute “hreflang” not allowed on element “li” at this point.
Attribute “placeholder” not allowed on element “form” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “about” not allowed on element “article” at this point.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Empty heading.
The “article” role is unnecessary for element “article”.
The “contentinfo” role is unnecessary for element “footer”.
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