Occ.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “”stylesheet”” for attribute “rel” on element “link”: The string “”stylesheet”” is not a registered keyword.
Bad value “”text/css”” for attribute “type” on element “link”: Expected a token character but saw “”” instead.
Bad value “”screen”” for attribute “media” on element “link”: Expected “(” or letter at start of a media query part but saw “”” instead.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Attribute “target” not allowed on element “button” at this point.
The element “button” must not appear as a descendant of the “a” element.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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