Howsci.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “type” attribute is unnecessary for JavaScript resources.
Element name “wb:follow-button” cannot be represented as XML 1.0.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The first occurrence of ID “user_login” was here.
The “charset” attribute on the “script” element is obsolete.
Attribute with the local name “xmlns:wb” is not serializable as XML 1.0.
Errors:
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
Bad element name “wb:follow-button”: Code point “U+003A” is not allowed
Bad value “https:/so.howsci.com/” for attribute “href” on element “a”: Expected a slash ("/").
Stray end tag “a”.
Attribute “name” not allowed on element “div” at this point.
Element “h4” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “user_login”.
Stray start tag “html”.
Attribute “xmlns:wb” not allowed here.
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