Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
Attribute “aria-required” is unnecessary for elements that have attribute “required”.
The “navigation” role is unnecessary for element “nav”.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
Forbidden code point U+0093.
Forbidden code point U+0094.
Bad value “"active"” for attribute “selected” on element “option”.
Attribute “noval” not allowed on element “form” at this point.
Attribute “min” not allowed on element “select” at this point.
Attribute “w” not allowed on element “img” at this point.
Attribute “h” not allowed on element “img” at this point.
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
No “p” element in scope but a “p” end tag seen.
Bad value “31.12.2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “youTube_video” for attribute “rel” on element “a”: The string “youTube_video” is not a registered keyword.
Attribute “alt” not allowed on element “a” at this point.
“=” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
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