Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “alt” not allowed on element “div” at this point.
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.
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Element “optgroup” is missing required attribute “label”.
No space between attributes.
Bad value “button” for attribute “type” on element “a”: Subtype missing.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “class"twitter"” not allowed on element “li” at this point.
Attribute “class"flickr"” not allowed on element “li” at this point.
Duplicate ID “social-footer”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Attribute “class"twitter"” is not serializable as XML 1.0.
Attribute “class"flickr"” is not serializable as XML 1.0.
The first occurrence of ID “social-footer” was here.
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