Visitlisboa.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Errors:
Attribute “hreflang” not allowed on element “li” at this point.
Bad value “” for attribute “name” on element “button”: Must not be empty.
Stray end tag “div”.
Bad value “group1” for attribute “rel” on element “a”: The string “group1” is not a registered keyword.
Bad value “285px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.
Bad value “285px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “font” element is obsolete. Use CSS instead.
The “aria-labelledby” attribute must point to an element in the same document.
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