Errors:
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 “” for attribute “id” on element “body”: An ID must not be the empty string.
Element “li” not allowed as child of element “header” in this context. (Suppressing further errors from this subtree.)
Element “object” is missing one or more of the following attributes: “data”, “type”.
The element “a” must not appear as a descendant of the “a” element.
The element “header” must not appear as a descendant of the “header” element.
Element “style” not allowed as child of element “main” in this context. (Suppressing further errors from this subtree.)
Bad value “presentation” for attribute “role” on element “video”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “figcaption” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “required” not allowed on element “input” at this point.
Attribute “required” is only allowed when the input type is “checkbox”, “date”, “datetime-local”, “email”, “file”, “month”, “number”, “password”, “radio”, “search”, “tel”, “text”, “time”, “url”, or “week”.
Element “source” is missing required attribute “srcset”.
Element “img” is missing required attribute “src”.
Stray end tag “source”.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
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