Vrmintel.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Start tag “head” seen but an element of the same type was already open.
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.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
The “center” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” not allowed as child of element “label” in this context. (Suppressing further errors from this subtree.)
Attribute “alt” not allowed on element “a” at this point.
Bad value “” for attribute “id” on element “div”: An ID must not be the empty string.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
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