Vlh.de W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Errors:
Bad value “https://fonts.googleapis.com/css?family=Raleway:800,400,300|Open+Sans:700,400,300” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Bad value “schema.DC” for attribute “rel” on element “link”: The string “schema.DC” is not a registered keyword.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
The element “button” must not appear as a descendant of the “a” element.
Element “dl” is missing a required child element.
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