Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “img” is missing required attribute “src”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “h1” not allowed as child of element “strong” in this context. (Suppressing further errors from this subtree.)
No space between attributes.
A slash was not immediately followed by “>”.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Bad value “document.lfirmarestaurant.action=” for attribute “onsubmit” on element “form”: syntax error
Attribute “http:” not allowed on element “form” at this point.
Attribute “essen.salzburg24.at” not allowed on element “form” at this point.
Attribute “welcome.asp"” not allowed on element “form” at this point.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “id” on element “ul”: An ID must not be the empty string.
Element “br” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
End tag “td” seen, but there were open elements.
Unclosed element “a”.
Duplicate attribute “src”.
Text not allowed in element “iframe” in this context.
Duplicate ID “”.
“select” start tag where end tag expected.
Attribute “_lpchecked” not allowed on element “form” at this point.
Element “input” with attribute “type” whose value is “button” must have non-empty attribute “value”.
Stray end tag “input”.
Bad element name “fb:like-box”: Code point “U+003A” is not allowed
Bad value “http://www.salzburg-airport.com/de/passagiere-besucher/fluginfo/saisonflugplan/"” for attribute “href” on element “a”: Illegal character in path segment: “"” is not allowed.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Bad value “_new” for attribute “target” on element “a”: Reserved keyword “new” used.
Duplicate attribute “frameborder”.
Bad value “250px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “360px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
Warnings:
Attribute “http:” is not serializable as XML 1.0.
Attribute “welcome.asp"” is not serializable as XML 1.0.
The first occurrence of ID “” was here.
Element name “fb:like-box” cannot be represented as XML 1.0.
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