Prevue.it W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “Cache-control” for attribute “http-equiv” on element “meta”.
Attribute “charset” not allowed on element “meta” at this point.
Bad value “text/html” for attribute “content” on element “meta”: The legacy encoding declaration did not start with “text/html;”.
A document must not include more than one “meta” element with a “charset” attribute.
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 for attribute “src” on element “img”: Illegal character in scheme data: line break is not allowed.
Bad value “scroll” for attribute “rel” on element “a”: The string “scroll” is not a registered keyword.
Bad value “prefetch” for attribute “rel” on element “a”: The string “prefetch” 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.
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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