Transdev.pt W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “: og: http://ogp.me/ns# article: http://ogp.me/ns/article# book: http://ogp.me/ns/book# profile: http://ogp.me/ns/profile# video: http://ogp.me/ns/video# product: http://ogp.me/ns/product#” for attribute “prefix” on element “html”.
Bad value “100%” for attribute “height” on element “video”: Expected a digit but saw “%” instead.
Bad value “100%” for attribute “width” on element “video”: Expected a digit but saw “%” instead.
Bad value “1” for attribute “autoplay” on element “video”.
Bad value “1” for attribute “muted” on element “video”.
Bad value “1” for attribute “loop” on element “video”.
Bad value “” for attribute “preserveAspectRatio” on element “svg”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “main” role is unnecessary for element “main”.
The “navigation” role is unnecessary for element “nav”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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