Errors:
Bad value “//w3.org/1999/xhtml” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
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 “//fonts.googleapis.com/css?family=Roboto|https://fonts.google.com/specimen/Roboto” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
Bad value “10 Mai, 2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “9 Mai, 2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “8 Mai, 2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “7 Mai, 2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “6 Mai, 2018” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
The “center” element is obsolete. Use CSS instead.
End tag “br”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
No “p” element in scope but a “p” end tag seen.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
Empty heading.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
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